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- Newsgroups: rec.birds
- Path: sparky!uunet!sarge!edm
- From: edm@verdix.com (Ed Matthews)
- Subject: January Optics FAQ
- Message-ID: <1993Jan27.192234.6250@verdix.com>
- Organization: Verdix Corp
- Date: Wed, 27 Jan 1993 19:22:34 GMT
- Lines: 677
-
- Frequently Asked Questions about Optics for Birding
-
- This is the monthly posting of frequently asked questions about optics
- for birding. Send any comments, suggestions, or additions to Ed
- Matthews (edm@verdix.com).
-
- Summary of Changes Since Last Publication
- =========================================
-
- + Clarifications
- + New Info about Aging vs. Pupil Dilation
- + More on Buying Services
- + Info on Foreign Market Goods
- + Close Focus Info
-
- Help Me
- =======
-
- 1. Can you tell me if Bogen and Manfrotto tripod model numbers correspond?
- 2. Can you give me information on where to buy optics?
-
- Table of Contents
- =================
-
- 1. General Advice
- 2. Common Questions About Optics
- 2.1 What does 7x35 mean?
- 2.2 How do I chose a magnification level?
- 2.3 What about field-of-view?
- 2.4 What about rubber armoring?
- 2.5 What about eyeglasses?
- 2.6 What are the pros and cons of fixed versus zoom eyepieces for scopes?
- 2.7 What about 45 degree eyepieces?
- 2.8 How about taking pictures through a scope?
- 2.9 How close should I be able to focus?
- 2.10 Which Inexpensive Binoculars Would You Recommend to a Beginner?
- 3. Tripods
- 4. Ratings
- 4.1 Scopes
- 4.2 Binoculars
- 4.3 User Surveys
- 5. Sources for Optical Equipment
- 6. Useful Reference Material
- 7. Contributors
-
- 1. General Advice
- =================
-
- Don't buy any optical equipment without first field testing it,
- especially if you wear glasses. Go to a popular birding spot and ask
- to try various scopes and tripods. This is the only way to determine
- individual preferences such as weight, balance, and desirable
- magnification level.
-
- Users of most tripod brands report loose parts and some report rust.
- Tripods, like any other equipment with moving parts, require periodic
- tightening and cleaning.
-
- A good strap on a scope or binoculars increases comfort dramatically.
- The new breed of neoprene straps from OpTech come highly recommended.
- They are available from most optics merchants and camera shops.
-
- 2. Common Questions About Optics
- ================================
-
- 2.1 What does 7x35 mean?
-
- The first number is the magnification. The second is the size in
- millimeters of the objective lens. The objective lens is the large
- lens through which the light first enters the binocular or scope.
-
- Objective lens size is a key factor in how much light enters the
- instrument. To determine the relative brightness of an instrument,
- divide the objective lens size by the magnification (e.g., 35mm/7 =
- 5mm). Optical instruments cease to be brighter when this measure,
- called the exit pupil, exceeds the size of your pupil.
-
- Apparently, as you age, your pupil does not dilate as much a when you
- are younger. By age 40, your pupil dilates to a maximum of about
- 5mm. Buying binoculars with a larger exit pupil is a waste of money.
-
- If exit pupil were the only factor in brightness, your choice would
- be easy. However, the quality of the glass and its coatings play
- a large part in determining brightness. You will find that good
- 10x40 (4mm exit pupil) binoculars are generally brighter than cheap
- 7x35 (5mm exit pupil) binoculars.
-
- 2.2 How do I chose a magnification level?
-
- The lower the magnification, the shorter the effective range of the
- instrument. As a payoff, you get a brighter image and a wider field-
- of-view. The higher the magnification, the harder the instrument
- is to hold steady, the less bright the image, and the narrower the
- field-of-view.
-
- For binoculars, common magnification levels are 7, 8, and 10. Good
- quality optics are generally more important than magnification level.
-
- For scopes, the most popular range is between 20x and 40x. Distortion
- from heat shimmer becomes a big factor over 40x. Lower than 20x limits
- the useful range of the scope.
-
- 2.3 What about field-of-view?
-
- Binoculars typically have a label that expresses field-of-view in
- degrees and/or width at a given distance. Expressed in degrees, field-
- of-view means that portion of a circle (360 degrees) visible at a
- certain distance.
-
- In the US, we calculate field-of-view at a distance of 1000 yards.
- Typical field-of-view values at 1000 yards range between 5 and 8.5
- degrees, which correspond to a field-of-view 263 feet to 446 feet wide.
-
- The wider the field-of-view, the better the instrument for picking up
- motion in the distance. The narrower the field-of-view, the better the
- instrument is for closeups. Less expensive instruments with a large
- field-of-view generally have considerable distortion at the edges.
-
- In many cases, the actual field-of-view may be markedly different
- than what the manufacturer indicates it is.
-
- 2.4 What about rubber armoring?
-
- Binoculars and scopes are sometimes clad in rubber -- this is known as
- rubber armoring. Rubber armoring provides protection against corrosion
- and dirt, helps cushion blows to the instrument, and gives a less
- slippery surface to grip. Armoring adds a little weight and may
- require maintenance with a rubber preservative. Many feel rubber
- preservatives leave a greasy feeling.
-
- 2.5 What about eyeglasses?
-
- People who wear eyeglasses often have trouble with scopes and
- binoculars. DO NOT BUY BINOCULARS OR SCOPES WITHOUT TESTING THEM WITH
- YOUR GLASSES. Try several models with your glasses. The Bausch & Lomb
- Elite scopes with fixed lenses are excellent for birders with glasses.
- Several scopes have optional long-relief eye pieces, which you will
- need if you wear glasses.
-
- 2.6 What are the pros and cons of fixed versus zoom eyepieces for scopes?
-
- Fixed magnification eyepieces tend to give a crisper and brighter image.
- Zooms can be useful, but unless you spend a lot of money, can be of lesser
- quality than fixed lenses. Some birders prefer interchangeable fixed lenses
- (e.g., a 25x lens and a 40x lens) to a zoom. Zooms on the expensive scopes
- (e.g., Kowa) are excellent.
-
- 2.7 What about 45 degree eyepieces?
-
- They are not hard to use when you get used to them and are preferable for
- watching flying birds, especially those migrating raptors. If you're tall,
- you can use a slightly smaller tripod. If you're short, the lower scope
- gives more opportunity for something to get in your way. A drawback is that
- the eyepiece is angled up into the rain and blowing dust.
-
- 2.8 How about taking pictures through a scope?
-
- General consensus is that if you want to take professional pictures, don't
- use your scope. It requires a really steady (heavy) tripod and the combo
- of scope and camera is heavy and awkward. Focusing is difficult and close
- focusing is not generally possible. Requires fast film and bright sun.
-
- 2.9 How close should I be able to focus?
-
- [From _The Complete Birder_, Houghton Mifflin, Boston, 1988, by Jack Connor]
-
- Binoculars that focus near at hand are essential for successful
- woodland birding. In fact, a number of problematic pairs of small
- birds can be visually separated only at close range: Carolina and
- Black-capped Chickadees; Sedge and Marsh Wrens; Mourning and
- Connecticut Warblers; Le Conte's and Sharp-tailed Sparrows; Cassin's
- and Botterei's Sparrows; and many others.
-
- Fortunately, close focus is one binocular feature that can be tested in
- a store. Find the closest line or spot on the floor you can see sharply
- through the binoculars, then count your paces as you walk to it. For
- an accurate test, first adjust the dioptric-compensation ring for the
- difference in strenghts of your two eyes. How far you need to turn that
- ring and how much play remains in the center-focusing mechanism will
- determine how closely you can focus.
-
- A close-focus range of 15 to 18 feet is the least you should accept. If
- you can't look at birds closer than that, you'll find yourself stepping
- backward into cat briars and poison ivy to try maintain distance.
-
- If you are a particularly dedicated sparrow and warbler chaser, you're
- likely to be happier with a minimum range of about 10 feet. Depending
- on your eye strength, binoculars can be found with close-focus ranges
- down to 6 feet...."
-
- 2.10 Which Inexpensive Binoculars Would You Recommend to a Beginner?
-
- Many people consider the Bushnell Birder 7x35 a great buy at $75 or under.
-
- 3. Tripods
- ==========
-
- Users of most tripod brands report loose parts and some report rust. Tripods
- are like any other equipment: they do require some preventative maintenance.
- The large majority of readers use one of two tripods, the Bogen 3021 or
- the Davis & Sandford RTS. Both are described below. Gitzo also makes
- fine tripods which are popular in Europe.
-
- Bogen (Manfrotto outside the United States)
-
- [note: it is not clear whether Bogen model numbers correspond to Manfrotto]
-
- Model 3021 is most popular with birders; lesser models are not sturdy
- enough; larger models are overkill. With the micro-fluid head, it
- weighs about eight pounds without scope, so it requires a strap.
- However, the weight makes the scope very steady in the wind. The quick
- release plate for the micro-fluid head is nice, especially for
- switching between scope and camera. The leg levers take some strength
- to operate. Leg can open noisily if not careful. Good for tall
- birders. Replacement parts are readily available. Users are generally
- happy with this tripod.
-
- Davis & Sanford (Tiffen)
-
- Model RTS is no frills, solid, lightweight (4.75 lbs), and fast to
- open because of its twist-to-unlock legs. Is not as tall as Bogen
- 3021. [Editor's note: I'm 6'3" and the Bogen is a better fit.] Users
- find this tripod plenty sturdy even with heavy scopes. The pan-head is
- very simple -- twist the pan-arm to loosen and twist back to tighten in
- place. The quick change screw for quick release mounting is nice.
- Users seem to be universally happy with this tripod.
-
- 4. Ratings
-
- 4.1 Scopes
-
- The following is a summary of the excellent article "Scanning for Optics II"
- from _The Living Bird Quarterly_, Autumn 1990, pp 12-15. Authors are
- Bonney and Forbes-Robertson. Highest rating is 1, lowest is 5.
-
- 1. Kowa TSN-4 and TSN-2: winners; zoom clear; if you have the money, buy the 4.
-
- 1. Nikon ED II Fieldscope: excellent; smaller, lighter than Kowas; zoom clear;
- focus ring awkward; depth of field shallow.
-
- 2. Optolyth TBG80: very good; image not sharp at high power; smaller field-
- of-view than Kowa; shallower depth of field.
-
- 2. Mirador SSD: can't match TSN-2; good clarity, but dark.
-
- 2. Bausch & Lomb Elite 22x: not as clear as some; outstanding for eyeglasses.
-
- 3. Questar Field Model: phenomenal image; 6x, 50x, and 80x impractical for
- most birding; heavy.
-
- 3. Celestron C-90: heavy; bright, clear image; small field-of-view; 33x only;
- focus awkward.
-
- 3. Zeiss 30x60 B/GA: image bright, but mediocre; not up to Zeiss reputation.
-
- 3. Bausch & Lomb Elite 15-45x: only good, unlike 22x; image worse as zoom
- increases.
-
- 3. Bushnell Spacemaster: best inexpensive scope; use 22x, zoom not good.
-
- 4. Optolyth 22-60x 70mm: image excellent; field-of-view tiny; shakes in wind.
-
- 4. Swarovski 25-40x 75 NZ and 30-75x 75 NZ: didn't care for either.
-
- 4. Celestron C-60: disappointment; dark and moderately clear.
-
- 5. Meade Pathfinder II and Swift Searcher: bad image.
-
- 4.2 Binoculars
- ==============
-
- [Thanks to Sid Johnson for providing the softcopy of this report that
- appeared in "Binocular Quest", _Living Bird_, Autumn 1992,
- authors T. Culver and H. Gerhart.]
-
- Suggested
- List Prism
- Model Price Type Armor? Warranty
-
- Over $800:
-
- * Bausch & Lomb Elite 10x42 $1,956 Roof Yes Limited Lifetime
- * Bausch & Lomb Elite 8x42 $1,900 Roof Yes Limited Lifetime
- * Bausch & Lomb Elite 7x36 $1,704 Roof Yes Limited Lifetime
- * Leica Ultra 10x42 BA $1,590 Roof Yes Lifetime
- * Leica Ultra 8x42 BA $1,590 Roof Yes Lifetime
- Nikon Classic Eagle 8x40 DFC $1,232 Roof No 25-year Limited
- * Zeiss Dialyt 10x40 B/GAT $1,250 Roof Yes Lifetime
- * Zeiss Dialyt 7x42 B/GAT $1,215 Roof Yes Lifetime
-
- $500-$800:
-
- aus Jena Luxus 10x40 $775 Roof No Limited Lifetime
- Bausch 7 Lomb Custom 10x40 $528 Porro Yes Limited Lifetime
- Nikon Execulite 9x30 $567 Roof No 25-year Limited
- * Nikon E CF HP 8x30 $512 Porro No 25-year Limited
- * Optolyth Touring 10x40 $608 Roof Yes Limited Lifetime
- Swift Audubon 7x35 $600 Roof Yes Lifetime
-
- $200-$500:
-
- Celestron Ultima 10x42 $350 Porro No Limited Lifetime
- Celestron Ultima 8x32 $350 Porro No Limited Lifetime
- Minolta Weathermatic 7x42 $406 Roof Yes 25-year Limited
- Optolyth Alpin 10x40 $360 Porro Yes Limited Lifetime
- Optolyth Alpin 7x42 $360 Porro Yes Limited Lifetime
- Optolyth Alpin 8x30 $298 Porro No Limited Lifetime
- Pentax DCF 8x42 $375 Roof No Original Owner
- Pentax PCF 7x50 $220 Porro No Original Owner
- Pentax PCF 7x35 $200 Porro No Original Owner
- Redfield WP 10x50 $407 Roof Yes Limited Lifetime
- Redfield WP 7x35 $361 Roof Yes Limited Lifetime
- Swift Audubon 8.5x44 $399 Porro No Lifetime
-
- * Swift Ultra Lite 8x42 ZWCF $345 Porro Yes Lifetime
- Swift Egret 10x42 HCF $288 Roof Yes Lifetime
-
- Under $200:
-
- * Bushnell Birder 7x35 $75 Porro No Limited Lifetime
- Minolta Standard 7x35 $141 Porro Yes 25-year Limited
-
- Compacts:
-
- * Bausch & Lomb Custom Compact 7x26 $457 Rev. Porro No Limited Lifetime
- Leica 10x25 BCA $645 Roof Yes Limited Lifetime
- Leica 8x20 BCA $615 Roof Yes Limited Lifetime
- Minolta Pocket 7x21 $137 Rev. Porro No 25-year Limited
- Minolta Compact 8x23 $132 Rev. Porro No 25-year Limited
- Nikon Travelite III 9x25 $156 Rev. Porro No 25-year Limited
- Pentax UCF 8x24 $160 Rev. Porro No Limited Lifetime
- Redfield 8x24 $210 Roof No Limited Lifetime
- Swift Micron 8x25 CF $120 Rev. Porro No Limited Lifetime
- Zeiss Design Selection 8x20 BT $530 Roof No 25-year
-
- * Top rated
-
- Play of
- Interpupil Good for Weight Focus
- Model Distance Eyeglasses? (ounces) (degrees)
-
- Over $800:
-
- * Bausch & Lomb Elite 10x42 2-3/16" - 2-7/8" 2 28.1 400
- * Bausch & Lomb Elite 8x42 2-3/16" - 2-7/8" 1 29.1 400
- * Bausch & Lomb Elite 7x36 2-3/16" - 2-7/8" 1 25.4 400
- * Leica Ultra 10x42 BA 2-3/16" - 2-7/8" 2 32.0 330
- * Leica Ultra 8x42 BA 2-3/16" - 2-7/8" 2 32.0 330
- Nikon Classic Eagle 8x40 2-1/8" - 2-13/16" 2 28.2 190
- * Zeiss Dialyt 10x40 B/GAT 2-3/16" - 3" 2 26.4 330
- * Zeiss Dialyt 7x42 B/GAT 2-1/4" - 2-15/16" 1 28.2 450
-
- $500-$800:
-
- aus Jena Luxus 10x40 2-3/16" - 2-7/8" 3 24.6 270
- Bausch 7 Lomb Custom 10x40 2-1/4" - 2-13/16" 2 30.9 460
- Nikon Execulite 9x30 2-3/16" - 2-7/8" 4 16.7 630
- * Nikon E CF HP 8x30 1-7/8" - 2-7/8" 2 20.0 330
- * Optolyth Touring 10x40 2-1/8" - 3" 2 24.0 410
- Swift Audubon 7x35 2-1/4" - 3-1/16" 2 21.0 460
-
- $200-$500:
-
- Celestron Ultima 10x42 2" - 2-7/8" 2 19.7 360
- Celestron Ultima 8x32 2" - 3" 2 17.4 370
- Minolta Weathermatic 7x42 2-1/4" - 2-7/8" 1 29.1 270
- Optolyth Alpin 10x40 2" - 2-3/4" 4 18.2 690
- Optolyth Alpin 7x42 2" - 2-3/4" 2 18.1 690
- Optolyth Alpin 8x30 2" - 2-3/4" 4 14.9 690
- Pentax DCF 8x42 2-1/4" - 2-7/8" 2 31.0 360
- Pentax PCF 7x50 2-3/16" - 2-3/4" 2 31.8 590
- Pentax PCF 7x35 2-3/16" - 2-3/4" 3 24.3 560
- Redfield WP 10x50 2-3/8" - 3-1/16" 3 28.6 170
- Redfield WP 7x35 2-5/16" - 3-1/16" 2 20.5 170
- Swift Audubon 8.5x44 2-1/8" - 3-1/4" 2 28.9 460
- * Swift Ultra Lite 8x42 ZWCF 2" - 2-15/16" 2 21.0 370
- Swift Egret 10x42 HCF 2-1/4" - 2-13/16" 4 18.3 320
-
- Under $200:
-
- * Bushnell Birder 7x35 2-3/16" - 2-7/8" 3 18.8 460
- Minolta Standard 7x35 2-3/16" - 2-13/16" 3 26.8 270
-
- Compacts:
-
- * B&L Custom Compact 7x26 2-1/4" - 3-1/8" 2 11.5 370
- Leica 10x25 BCA 1-1/4" - 3-1/4" 4 8.8 740
- Leica 8x20 BCA 1-1/4" - 3-1/4" 4 8.1 740
- Minolta Pocket 7x21 1-3/8" - 2-3/4" 4 9.7 350
- Minolta Compact 8x23 2-1/4" - 2-7/8" 4 8.8 340
- Nikon Travelite III 9x25 2-1/8" - 2-7/8" 4 9.4 350
- Pentax UCF 8x24 2-3/16" - 2-15/16" 4 9.9 590
- Redfield 8x24 1-3/8" - 3-1/16" 4 9.6 270
- Swift Micron 8x25 CF 2-1/4" - 2-13/16" 4 10.1 740
- Zeiss Design Selection 8x20 1-1/4" - 2-7/8" 4 6.4 350
-
- * Top rated Numeric Ratings: 1 to 5, 1 is best
-
-
- Optical Min. Field of
- Focus Bright- Perfor- Focus View at
- Model Feel ness mance Dist. 230' Fog
- Over $800:
-
- * Bausch & Lomb Elite 10x42 1 2 1 11' 23.8' N
- * Bausch & Lomb Elite 8x42 1 1 1 10.5' 27.5' N
- * Bausch & Lomb Elite 7x36 1 1 1 5' 30' N
- * Leica Ultra 10x42 BA 1 2 1 14' 20' N
- * Leica Ultra 8x42 BA 1 1 1 12' 20' N
- Nikon Classic Eagle 8x40 DFC 1 3 2 14.5' 27.5' N
-
- * Zeiss Dialyt 10x40 B/GAT 2 3 1 15' 20' N
- * Zeiss Dialyt 7x42 B/GAT 1 1 1 9.5' 30' N
-
- $500-$800:
-
- aus Jena Luxus 10x40 1 3 2 18' 20' N
- Bausch 7 Lomb Custom 10x40 1 3 2 12' 20' Y
- Nikon Execulite 9x30 1 5 2 11' 22.5' Y
- * Nikon E CF HP 8x30 1 2 1 11' 32.5' Y
- * Optolyth Touring 10x40 2 3 1 16' 27.5' Y
- Swift Audubon 7x35 2 2 2 10' 20' N
-
- $200-$500:
-
- Celestron Ultima 10x42 1 2 2 15' 23.8' Y
- Celestron Ultima 8x32 2 4 3 12' 30' Y
- Minolta Weathermatic 7x42 1 3 3 12' 25' N
- Optolyth Alpin 10x40 1 3 3 14' 25' Y
- Optolyth Alpin 7x42 1 5 3 27' 25' N
- Optolyth Alpin 8x30 1 5 3 13' 32.5' Y
- Pentax DCF 8x42 1 5 3 24' 27.5' N
- Pentax PCF 7x50 2 1 3 15' 22.5' Y
- Pentax PCF 7x35 2 3 4 7' 25' Y
- Redfield WP 10x50 2 4 3 24.5' 22.5' N
- Redfield WP 7x35 2 4 3 10.5' 25' N
- Swift Audubon 8.5x44 1 3 2 10.5' 31.25' Y
- * Swift Ultra Lite 8x42 ZWCF 1 2 2 16' 20' N
- Swift Egret 10x42 HCF 1 5 3 14' 25' N
-
- Under $200:
-
- * Bushnell Birder 7x35 2 2 3 13' 22.5' Y
- Minolta Standard 7x35 2 3 3 12.5' 32' Y
-
- Compacts:
-
- * Bausch & Lomb Custom Comp. 7x26 1 1 2 6' 27.5' Y
- Leica 10x25 BCA 3 4 3 16' 20' N
- Leica 8x20 BCA 3 4 4 8' 26.3' N
- Minolta Pocket 7x21 2 4 5 6' 26.3' N
- Minolta Compact 8x23 2 3 5 21' 25' Y
- Nikon Travelite III 9x25 2 2 3 12' 20' Y
- Pentax UCF 8x24 3 2 5 8.5' 25' N
- Redfield 8x24 2 4 5 14.5' 28.5' N
- Swift Micron 8x25 CF 2 3 4 6' 20' Y
- Zeiss Design Selection 8x20 BT 2 3 4 8' 25' Y
-
- * Top rated Numeric Ratings: 1 to 5, 1 is best
-
- 4.3. User Surveys
- =================
-
- From _British Birds_, 84:7, July 1991, pp. 267-282 comes this reader survey.
- Many thanks to Adrian Wander for typing this in.
-
- Most Popular Binoculars
- -----------------------
- 1 Zeiss West Dialyt 10*40 28.4%
- 2 Zeiss West 7*42 8.8%
- 3 Leitz Trinovid 10*40 6.0% Other well known makes placed:
- 4 Swift Audubon 8.5*44 5.5%
- 5 Optolyth Alpin 10*40 4.9% 11 Bausch and Lomb Elites 10*42 1.7%
- 6 Optolyth Alpin 10*50 4.2% 12 Bausch and Lomb Elites 8*42 1.4%
- 7 Zeiss Jena Jenoptem 10*50 3.7% 13 Leica 10*42 1.3%
- 8 Leitz Trinovid 8*40 2.8% 16 Leitz Trinovid 7*42 1.2%
- 9 Swarovski/Habicht Diana 10*40 2.4% 17 Zeiss West Dialyt 8*30 1.1%
- 10 Zeiss Jena Notarem 10*40 1.9%
-
- Most Highly Rated Binoculars
- ----------------------------
- (6=excellent 5=very good 4=good 3=satisfactory 2=poor 1=very poor)
-
- Make No Owners Average Rating
- 1 Bausch and Lomb Elite 8*42 12 6.00
- 2 Leica 10*42 11 6.00
- 3 Optolyth 9*63 5 6.00
- 4 Zeiss West 7*42 72 5.94
- 5 Leitz Trinovid 8*40 23 5.87
- 6 Bausch and Lomb Elite 10*42 14 5.86
- 7 Leitz Trinovid 7*42 10 5.80
- 8 Leitz Trinovid 10*40 50 5.78
- 9 Zeiss West Dialyt 10*40 241 5.76
- 10 Leica 8*42 4 5.75
-
- (13 Zeiss West Dialyt 8*30 9 5.56
- 14 Swarovski/Habicht Diana 10*40 20 5.50
- 20 Zeiss West 10*50 4 5.25
- 21 Swift Audubon 8.5*44 46 5.20
- 23 Optolyth Alpin 8*40 11 5.09)
-
- Most Satisfactory Binoculars (number of owners who would buy the same again)
- ----------------------------------------------------------------------------
-
- 1 Leica 8*42 4/4 100.0%
- 2 Bausch and Lomb Elite 8*42 11/12 91.7
- 3 Zeiss West 7*42 61/73 83.6
- 4 Leica 10*42 9/11 81.8
- 5 Bausch and Lomb Elite 10*42 11/14 78.6
- 6 Optolyth Alpin 8*30 2/3 66.7
- 7 Zeiss West Dialyt 10*40 154/236 65.3
- 8 Nikon 8*30 4/7 57.1
- 9= Swarovoski/Habicht Diana 10*40 10/20 50.0
- 9= Opticron Classic 10*42 3/6 50.0
-
- (14 Swift Audubon 8.5*44 15/46 32.6
- 15 Optolyth Alpin 10*40 13/41 31.7
- 16 Leitz Trinovid 7*42 3/10 30.0
- 20 Optolyth Alpin 10*50 9/35 25.7
- 21 Leitz Trinovid 10*40 12/50 24.0
- 22 Leitz Trinovid 8*40 5/23 21.7
- 24 Optolyth Alpin 8*40 2/11 18.2
- 26 Zeiss West Dialyt 8*30 1/9 11.1)
-
- Top Binoculars for the Future (intended future purchases)
- ---------------------------------------------------------
-
- 1 Zeiss West Dialyt 10*40 28.5%
- 2 Zeiss West 7*42 13.8%
- 3 Leica 10*42 8.8% Other well known makes placed:
- 4 Leica 8*42 4.2%
- 5= Leitz Trinovid 10*40 2.8% 11 Optolyth Alpin 10*50 1.8%
- 5= Swift Audubon 8.5*44 2.8% 14 Leitz Trinovid 8*40 0.8%
- 7= Bausch and Lomb Elites 10*42 2.6% 16 Swift Audubon 7*35 0.7%
- 7= Bausch and Lomb Elites 8*42 2.6% 18 Zeiss West Dialyt 8*30 0.5%
- 9 Optolyth Alpin 10*40 2.3%
- 10 Swarovski/Habicht Diana 10*40 1.9%
-
- Most Popular Scopes
- -------------------
-
- 1 Kowa TSN1/2 *77 16.2%
- 2 Bushnell Spacemaster *60 12.2%
- 3 Kowa TSN3/4 *77 7.7%
- 4 Optolyth TBS/G80 7.5%
- 5 Optolyth 30*75 6.9%
- 6 Nikon Fieldscope EDII *60 5.8%
- 7 Kowa TS1/2 *60 4.7%
- 8 Nikon Fieldscope ED *60 4.5%
- 9 Opticron High Resolution *60 3.6%
- 10 Bushnell/Bausch and Lomb Discoverer 15-60*60 3.2%
- (11 Optolyth 30*80 2.1%
- 12= Questar Mirrorlens 1.9%)
-
- Most Highly Rated Scopes
- ------------------------
- (6=excellent 5=very good 4=good 3=satisfactory 2=poor 1=very poor)
-
- Make No Owners Average Rating
- 1 Questar Mirrorlens 15 6.00
- 2 Kowa TSN3/4 *77 59 5.93
- 3 Nikon Fieldscope EDII 40 5.90
- 4 Nikon Fieldscope EDI 36 5.89
- 5 Nikon Fieldscope I and II 7 5.71
- 6 Optolyth TBS/G80 62 5.56
- 7 Kowa TSN1/2 *77 125 5.46
- 8 Optolyth 30*80 16 5.38
- 9 Alderscope 25*80 3 5.33
- 9= Swarovski/Habicht 30*75 3 5.33
- (11 Optolyth 30*75 52 5.17
- 13=Kowa TSN1/2 36 5.00
- 15 Bushnell Spacemaster *60 94 4.86
- 18 Bushnell/Bausch and Lomb
- Discoverer 15-60*60 25 4.52)
-
- Most Satisfactory Scopes (number of owners who would buy the same again)
- ------------------------------------------------------------------------
-
- 1 Kowa TSN3/4 *77 47/59 79.7%
- 2 Nikon Fieldscope EDI and II 58/76 76.3%
- 3 Questar Mirrorlens 11/15 73.3%
- 4 Optolyth TBS/G80 31/62 50.0%
- 5 Nikon Fieldscope I and II *60 3/7 42.9%
- 6 Optolyth 30*80 6/16 37.5%
- 7 Adlerscope 25*80 1/3 33.3%
- 8 Kowa TSN1/2 *77 37/125 29.6%
- 9 Optolyth 30*75 13/53 24.5%
- 10 Bushnell Spacemaster *60 19/94 20.2%
- (14 Kowa TSN1/2 *60 4/36 11.1%
- 16 Bushnell/Bausch and Lomb %
- Discoverer 15-60*60 1/25 4.0%)
-
- Top Telescopes for the Future (intended future purchases)
- ---------------------------------------------------------
-
- 1 Kowa TSN3/4 *77 20.5%
- 2 Nikon Fieldscope EDI and II 19.3%
- 3 Optolyth TBS/G80 9.2%
- 4 Kowa TSN1/2 *77 8.8%
- 5 Questar Mirrorlens 3.5%
- 6 Bushnell Spacemaster *60 3.2%
- 7 Kowa TS601/602 *60 2.7%
- 8 Optolyth 30*75 2.3%
- 9 Optolyth 30*80 1.6%
- 10 Nikon Fieldscope I and II 0.9%
-
-
- 5. Sources for Optical Equipment
- ================================
-
- If you belong to a buying service, try that first. One example: B & L
- Elite 22 x 60 scope, list: $750, best mailorder: $400, buying service: $200.
- Several credit cards offer buying services. Another buying service that
- is somewhat widespread throughout the US is United Consumers Club.
-
- Also, check the New York City mail order sources that advertise in the
- back of Popular/Modern Photography. Be aware, however, that these places
- often carry what are known as foreign market or grey market goods. These
- are products produced for sale in countries other than the US. Sometimes
- these products are manufactured to different specifications; sometimes
- they are identical. In any case, you will not have any US warranty on
- the goods and may not get any frills either (carrying case, strap, etc.).
- But the prices are appealing. Caveat emptor.
-
- Birding (518) 664-2011 **** CONFLICTS w/ below *******
-
- Birding (Amsterdam, NY) 518-842-0863 - no toll free number, but comments
- (above) about selection, price and advice at Christopher's apply here
- as well.
-
- Christopher's Ltd, Norman OK, (800) 356-6603, "primarily an
- astronomy-oriented optical dealer, but good selection, decent prices,
- and top-notch advice on many spotting scope options."
-
- Eagle (608) 271-4751, "really helpful"
- Executive Photo, New York NY, see any issue of Popular/Modern Photography
- National Camera (800) 624-8107
- Orion, Santa Cruz CA, (800) 447-1001
- Yoder (216) 893-2464
-
- 6. Useful Reference Material
- ============================
-
- "Binocular and Scope User Survey", _British Birds_, 84:7, July 1991,
- pp. 267-282.
-
- Bonney and Forbes-Robertson, "Scanning for Optics II", _The Living Bird
- Quarterly_, Autumn 1990, pp 12-15.
-
- _Birding_ (photo issue), February, 1989.
-
- Culver and Gerhart, "Binocular Quest", _Living Bird_, Autumn 1992.
-
- 7. Contributors
- ===============
-
- Thanks to the following individuals who have helped with this FAQ:
-
- Mike Burger
- Byron Butler
- Dalcio Dacol
- Sid Johnson
- Tony Lang
- Kevin McGowan
- Peter Nurkse
- David Rintoul
- Rocky Rothrock
- Daan Sandee
- Brian Townes
- Tim Walker
- Adrian Wander
- Steve Willner
- --
-
- Ed Matthews edm@verdix.com
- Manager, APSE Development
- Verdix Corporation Headquarters (703) 318-5800
-