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- Path: sparky!uunet!charon.amdahl.com!amdahl!JUTS!RUTS.ccc.amdahl.com!bjs
- From: bjs@RUTS.ccc.amdahl.com (Barry Sherman)
- Newsgroups: rec.photo
- Subject: Re: Velvia Reciprocity Info?
- Message-ID: <efvL02N=2ftt01@JUTS.ccc.amdahl.com>
- Date: 22 Dec 92 20:21:39 GMT
- References: <12430086@hpmwnpd2.sr.hp.com> <1992Dec21.234142.15741@jarvis.csri.toronto.edu>
- Sender: netnews@ccc.amdahl.com
- Reply-To: bjs@RUTS.ccc.amdahl.com (Barry Sherman)
- Followup-To: rec.photo
- Organization: Amdahl Corporation, Sunnyvale CA
- Lines: 52
-
- Alvin Chia-Hua Shih writes:
-
- (in response to a request for reciprocity characteristics for Fuji
- Velvia and 50):
-
- >
- >Fujichrome Velvia RVP:
- >
- >Exposure and Colour Balance Corrections for Reciprocity Failures:
- >
- >+---------------+-------------+------+------+------+-------+-----------------+
- >|Time (sec.) | 1/4000 to 1 | 4 | 8 | 16 | 32 | 64 |
- >|===============|=============|======|======|======|=======|=================|
- >|Filters | None | 5M | 7.5M | 10M | 12.5M | Not Recommended |
- >|---------------|-------------|------|------|------|-------|-----------------|
- >|Exposure Comp. | None | +1/3 | +1/2 | +2/3 | +1 | Not Recommended |
- >+---------------+-------------+------+------+------+-------+-----------------+
-
- According to the Fuji people, reciprocity characteristics are the same for
- Fuji 50D. I assume that 50 would behave similarly to 50D but don't know
- so for a fact.
-
- I've never let the "Not Recommended" stop me. I've successfully made exposures
- as long as 6 minutes on Velvia using a factor of +2 stops (meter read 1.5
- minutes so I exposed for 6). I used 15M, the maximum magenta filtration I had
- with me. Color showed a definite green shift - I think that another 7.5-10M
- would have been good. It worked out fine as the transparency was a 4x5
- intended solely as an original for printing and it was easy to correct the
- color shift.
-
- In addition, I've seen some stunning pictures made in slot canyons where
- the exposures were in the neighborhood of 30 *minutes* on Velvia with no
- color correcting filtration used (this photographer likes to keep things
- simple). I don't know what the original transparencies looked like - pretty
- green I assume - but the photographer was able to correct them very nicely in
- his printing.
-
- Barry
-
- --
-
-
- |----------------------------------------------------------------------------|
- | Barry Sherman, Amdahl Corp. | "It's much easier to go to exotic places and |
- | bjs@uts.ccc.amdahl.com | capture spectacular scenes than to take a |
- | | spectacular picture of a really boring |
- | | green pepper". - Anthony Tse |
- |----------------------------------------------------------------------------|
- | Amdahl, being a corporation, is a legal fiction. Therefore it is incapable|
- | of holding, let alone expressing, opinions. Unfortunately, this has been |
- | said of me as well. (I.e. My statments are mine, not Amdahl's.) |
- |----------------------------------------------------------------------------|
-