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10-01-2014, 12:30 PM   #61
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QuoteOriginally posted by Digitalis Quote
...and look at the price of it. Leaf shutters put some hefty constraints on how fast a lens can get. Copal, who have been the most common maker of leaf shutters only allow for f/2.2 lenses at the fastest. Seiko have been getting out of the shutter business from what I have heard. Pentax would have to outsource them from someone else, which can be really expensive or make their own - which in the short term can be majorly expensive but from a practical standpoint would be perhaps the best way to go.
Copal shutters are dead, sold out, not in production anymore... That is THE medium format problem. Companies have to create new leaf shutters. Larger f-stops faster speeds have not been accomplsihed int he last 20 years. Copal quality was really low, so there is a strong need jsut to replace them.

10-02-2014, 04:54 AM   #62
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Why not in production any more : because of quality of the metal ? industrial processes ? new regulations ?

Here is the 645 A 135mm f/4 LS with 645NII (taken with K20D + dental macro 100mm f/4 and AF140C) :


Last edited by Zygonyx; 10-02-2014 at 05:19 AM.
10-02-2014, 06:26 AM   #63
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QuoteOriginally posted by Zygonyx Quote
Why not in production any more : because of quality of the metal ? industrial processes ? new regulations ?

Here is the 645 A 135mm f/4 LS with 645NII (taken with K20D + dental macro 100mm f/4 and AF140C) :
Restriction of Hazardous Substances Directive - Wikipedia, the free encyclopedia

Old lenses are using lead in both the electronics and in the lens elements.
10-02-2014, 07:41 AM   #64
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So if copal are still made, why this comment?

10-02-2014, 01:36 PM   #65
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QuoteOriginally posted by dcshooter Quote
They stopped making mechanical leaf shutters for Medium Format at the end of last year. They are focusing on other types of shutters.
Oh, I see. This wasn't obvious at all from previous posts.
Clearly, they'll have to get a leaf shutter somewhere...
10-02-2014, 09:56 PM   #66
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QuoteOriginally posted by dcshooter Quote
Well, the Copal shutter is 50 year old tech, so I imagine it shouldn't be that difficult to clone. Probably out of patent by now, too....
Sure but taking a finished product and mounting it into your lens or manufacturing it yourself, even without patent prolems, and testing it before integrating it is something completely different.
10-03-2014, 08:03 AM   #67
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QuoteOriginally posted by dcshooter Quote
Well of course, but I imagine that high-end manufacturers such as Leica and Hasselblad would have little problem justifying passing on the added expense to their deep-pocketed buyers. It might be tougher for a company like Pentax, working with presumably tighter profit margins on the 645z and its lenses, to justify such an effort.
Indeed. We shall see.
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