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09-20-2012, 07:05 PM   #16
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Ed, 67 lenses on 645D = no spot metering, in fact, i think, center weighted averaging is the only in camera metering available when shooting 67 lenses on 645D. But i am so hopeful of being wrong, that i will double check tonight.......

09-20-2012, 07:16 PM   #17
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jargon

Sorry, Ed. With all the postings on all the blogs, along with the various reviews and advertisements, I've tried to "get with it" and am adopting some of the shorthand. The "FX" I mentioned refers to any of the sensors that generally replicate the dimensions of a frame of 35mm film, ie, 24mm x 36mm. (Countering that, "DX" refers to the smaller APS-c sensors that are about 40% of the full frame area. I should probably just do my research and start speaking in terms of Angle of View which is, after all, a clearer way of defining whether a lens is "wide," "normal" or some variant of "telephoto."

Because I spent several decades with 35mm SLRs, I can visualize the general effect of a 25mm lens compared with a 35mm, or 85mm, etc. So, it sounds like my 55mm from the 67 system might make an image through the 645D about like a 35 or 45mm lens on a Canikon DSLR. Huh?
09-20-2012, 10:16 PM   #18
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Yep - I think of the 55mm on the 645D as being just slightly wider than standard, so perhaps 45mm or 46mm in 35mm terms. But that's just my impression... By the way, simply comparing to a Canikon SLR is ambiguous because they make cameras with different format sensors (full frame, Canon makes APS-C and APS-H and Nikon's APS size is slightly different again). Better to compare to full frame 35mm than simply referring to Canikon SLRs (or other manufacturers' SLRs for that matter).
09-21-2012, 12:45 AM   #19
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I have tried the 67 400mm f/4 and 165mm f/4 Leaf Shutter lenses on the 645D. They both work fine. However, you have to ensure that you nail the focus when shooting with a long focal length and a large aperture. There is no split-prism focusing screen for the 645D. The focus-confirmation light of the 645D is not very accurate since you can turn the focusing ring left and right and the light is still on. Hope this helps.

Ed
---
EDWARD NGUYEN P H O T O G R A P H Y

09-21-2012, 05:55 AM   #20
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There is no split-prism focusing screen for the 645D

There actually is an option... #5 Large Horizontal Split Image Microprism for Pentax 645n/D

Also look into this... Magnifier for medium format

But.... as I just verified those links before posting, I find out the owner just passed away....sad...
Hopefully the company will carry on....those products are needed.
09-21-2012, 11:22 AM   #21
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Ed, you might want to try another copy of the latest 200/4. I have been very impressed with it's performance with B&W film in the 67II. It's resolving power is very close to the latest 67 55/4.

As to the 35mm based focal length equivalents of lenses on the 645D, multiply the focal length by .8. It's not exact, because of the different aspect ratio, but it's close.

Last edited by surfotog; 09-21-2012 at 01:25 PM.
09-21-2012, 12:28 PM   #22
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rough equivalency

Thanks, Surfotog. That .8 idea was the kind of thing I was looking for.
09-21-2012, 02:55 PM   #23
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It's relatively close to the 1.6 - 1.7 figure quoted above (but expressed the other way around - so the reciprocal) ;-)

09-21-2012, 02:57 PM   #24
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Re. the 200mm lens, it's not really the resolving power I am uncomfortable with. It's more the contrast, the drawing and the bokeh. I know this is subjective, but it's somehow insipid to my eye in how it renders things - even though resolution is high. Difficult to explain!
09-21-2012, 03:18 PM   #25
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Ed, Interesting how a lenses qualities are preceived differently by people. Nick Brandt, who does some interesting B&W African widlife work, loves the 200, and doesn't care for the M* 300/4 EDIF. I love them both!
09-21-2012, 03:40 PM   #26
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I still use the lens when it's the focal length I need - it just receives a bit more processing to make it look as I would wish. Here's an example...[IMG]
[/IMG]
09-21-2012, 06:07 PM   #27
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what about a new, second generation D?

Okay, I think I've got a pretty good feel for the lens issues. NOW, I'm hearing there's a new successor body in the pipeline. Is this imminent? Will there be some special attributes that make waiting (a couple of months? six?) a good idea? I have enough film to carry over to January.
09-22-2012, 07:53 PM   #28
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No one in a position to say anything (i.e. people who don't work for Pentax) know the answer to that one - at least as far as I know. Rumours suggest maybe 6 months or so, with both higher resolution and larger sensor, but that's pure speculation. If it does come, I also hope it has much better noise at all ISOs.
09-22-2012, 10:48 PM   #29
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looking ahead

If what you speculate comes true, Mr. Hurst, the Pentax will be a strong player in the MFD field, especially at its current price level. For a while now, I'm going to concentrate on using a formidible FILM camera the next several months -- my 67ii. Thanks, Ed, for your timely and thoughtful input about the conversion to digital and those intriguing possibilities.
09-23-2012, 05:10 PM   #30
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Where is a "higher resolution/larger sensor" going to go in a [645D] body already stretched to limits? You'll probably be looking at one that needs two people to carry it, a 20kg tripod and $20,000 to splash in the bank.
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