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02-17-2014, 11:30 PM   #1
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Can I use my 67 lenses on the new 645D 2014?

I have six primes (trending toward a seventh) for my 67ii. As I contemplate a move this year to digital SLR I consider IQ the prime factor in my deliberations. If I go D800E I also have to invest in five or six new lenses. If I can use what I have, I can put my dollars into a camera body, maybe the new 645D. So, the big question is, can I use my primes and get great IQ? What kind of adaptor do I have to use? What are the Pros and Cons of doing this?

02-17-2014, 11:52 PM   #2
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You can, with the Pentax 67->645 Adapter. Quality is variabile, it depends on the lens. Read the MF forum where there is many information about how 67 lenses performes on 645D.
02-18-2014, 12:03 AM   #3
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Here is an adapter for mounting 67 lenses on the 645D. I can't find an English version. It's only for MF.
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02-18-2014, 01:44 AM   #4
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QuoteOriginally posted by codger Quote
I have six primes (trending toward a seventh) for my 67ii. As I contemplate a move this year to digital SLR I consider IQ the prime factor in my deliberations. If I go D800E I also have to invest in five or six new lenses. If I can use what I have, I can put my dollars into a camera body, maybe the new 645D. So, the big question is, can I use my primes and get great IQ? What kind of adaptor do I have to use? What are the Pros and Cons of doing this?
See here:
Pentax 645D Review vs. Nikon D3x - Construction and Handling - PentaxForums.com

67 lenses, with the proper Pentax adapter, can be used in M and Av mode. Here's the adapter:
Pentax 67 Lens to Pentax 645 Body Adapter Reviews - Pentax 67 Teleconverters and Adapters - Pentax Lens Reviews & Lens Database


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02-20-2014, 07:02 AM   #5
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QuoteOriginally posted by codger Quote
I have six primes (trending toward a seventh) for my 67ii. As I contemplate a move this year to digital SLR I consider IQ the prime factor in my deliberations. If I go D800E I also have to invest in five or six new lenses. If I can use what I have, I can put my dollars into a camera body, maybe the new 645D. So, the big question is, can I use my primes and get great IQ? What kind of adaptor do I have to use? What are the Pros and Cons of doing this?

the short answer YES
02-20-2014, 12:07 PM   #6
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For the current 645D, YES. For the upcoming 645D II, no one knows for sure yet, but on the other hand there isn't any hint yet why it shouldn't work.

The only problem: 45mm is the widest non Fisheye 6x7 lens. Might be you need one shooter lens, too. Very good on the 645D according to my experience, among the 6x7 lenses: 45mm, 105mm. Good: 150mm (although f/2.8, it has to be stopped down to f/8 at least), 300/4 non ED (also, at least f8), 90/2.8 LS (again, f/8 or slower for good sharpness). Super: 55/4 latest version, 75/4, 200/4 new version, these lenses are close to perfect, even wide open. OK: 135mm Macro (for distant objects, haven't tried any macro shots), 165/2.8.
05-16-2014, 05:27 AM   #7
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QuoteOriginally posted by bull drinkwater Quote
the short answer YES
yes, I got mine at keh, I have the 135mm and the 300mm, they also had the adaptor at a good price. the images are great. the longer lenses are heavy as hell and need a lens support.
05-18-2014, 01:48 PM   #8
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QuoteOriginally posted by bull drinkwater Quote
yes, I got mine at keh, I have the 135mm and the 300mm, they also had the adaptor at a good price. the images are great. the longer lenses are heavy as hell and need a lens support.
don't forget to allow for a 1.62 crop factor. it will be impossible to get a wide angle lens. the only way to get wide angle is to use the 45mm 645 lens and pair it with a .5, 0.3 or .16 screw on lens.

05-18-2014, 10:16 PM   #9
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I would think the 35mm 645 lens or the 35mm 6x7 lens would provide a reasonably wide angle; no?
05-19-2014, 01:09 AM   #10
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QuoteOriginally posted by revdocjim Quote
I would think the 35mm 645 lens or the 35mm 6x7 lens would provide a reasonably wide angle; no?

from what I've been told, normal for the 645D is 55mm, the 6x7 35mm is 56mm for the 645d. that's normal. the 645 35mm is 44mm for the 645D you have to get down to 20mm or 25mm to really call it wide angle. I am experimenting with .5 and a .16 screw on lenses on my 45-85mm zoom to see well I can do. if I can figure out how to post them i'll share a few down the road.
05-19-2014, 03:36 AM   #11
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ummm... your calculations don't make sense. A 35mm lens is a 35mm lens regardless of what mount it is. So the 6x7 35mm lens and the 645 35mm lens will yield the same FOV on the 645D. The only difference will be a bit more curvature distortion with the 6x7 version since it is a fisheye, although given how much gets cropped by the 645D the effect wouldn't be nearly as pronounced as it is on a 6x7 camera. Those conversion figures you are using are supposed to be used to compare relative FOV angles that a given focal length will yield on various mounts.
05-19-2014, 04:11 AM   #12
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QuoteOriginally posted by revdocjim Quote
ummm... your calculations don't make sense. A 35mm lens is a 35mm lens regardless of what mount it is. So the 6x7 35mm lens and the 645 35mm lens will yield the same FOV on the 645D. The only difference will be a bit more curvature distortion with the 6x7 version since it is a fisheye, although given how much gets cropped by the 645D the effect wouldn't be nearly as pronounced as it is on a 6x7 camera. Those conversion figures you are using are supposed to be used to compare relative FOV angles that a given focal length will yield on various mounts.

it's the same principle as full frame vs a crop sensor. a smaller sensor captures a smaller portion of the image. the 645d has the smallest sensor ,the 645 lens was made for a bigger sensor, so you get a crop factor. if the 645d camera could switch back and forth between 645 and 645d, you'd see it in a hot second.
not meaning to give you a hard time, but I do this all the time. I shoot a sony a-850 a lot. it shifts between ff and asp with Minolta maxxum lenses you can see the diffefence , why wouldn't it be the same btween the 645d-645-and 6x7????

Last edited by bull drinkwater; 05-19-2014 at 04:26 AM.
05-19-2014, 06:04 AM   #13
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QuoteOriginally posted by bull drinkwater Quote
I shoot a sony a-850 a lot.....
I also shoot with the A850, and now the A7R. OT, I'd like to hear about your experience contrasting the A850 against the 645D, file -wise.
05-19-2014, 07:46 AM   #14
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QuoteOriginally posted by bull drinkwater Quote
it's the same principle as full frame vs a crop sensor. a smaller sensor captures a smaller portion of the image. the 645d has the smallest sensor ,the 645 lens was made for a bigger sensor, so you get a crop factor. if the 645d camera could switch back and forth between 645 and 645d, you'd see it in a hot second.
not meaning to give you a hard time, but I do this all the time. I shoot a sony a-850 a lot. it shifts between ff and asp with Minolta maxxum lenses you can see the diffefence , why wouldn't it be the same btween the 645d-645-and 6x7????
I'm fully aware of the crop factor of the 645D and how it affects the FOV. But if I read your earlier post correctly you said that the 6x7 35mm lens and the 645 35mm lens would give different results on the 645D. And that is the mistake I was trying to point out and correct. A 35mm lens is always a 35mm lens. The only difference between the 6x7 35mm lens and the 645 35mm lens is that the former has a larger image circle and that the former is a fisheye. Of course, depending on what camera the 35mm lens gets attached to and what frame size that camera captures the resulting FOV will be different. So the 645D with it's 44mm x 33mm sensor will crop out a larger percentage of the 6x7 35mm lens than it will when using the 645 35mm lens, but what remains in the captured image will be identical in terms of FOV.

If you want to think about in terms of full frame vs. aps-c, if I attach a Minolta 50/1.4 lens to my A77 camera and take a picture, and then with the help of a mount adapter, attach a medium format 50mm lens such as the Zenza Bronica Zenzanon-S 50/3.5 to the aps-c camera and take a picture, the two pictures will be identical, because a 50mm lens on an aps-c body always yields the same FOV.

Take a look at this table for the actual FOV numbers in degrees. The far left column is the focal length in mm. The subsequent columns show the FOV in degrees for each frame size. According to this chart a 35mm lens on the 645D will yield a FOV of 64.3 degrees. And that is all I am saying. Regardless of whether the lens was originally designed for the 6x7 frame or the 645 frame, or for large format for that matter, it makes absolutely no difference. On a 645D they will all yield 64.3 degrees. I hope this helps.
05-19-2014, 11:37 AM   #15
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If Pentax had made a rectilinear 35mm for the 6x7, the FOV would be much narrower than the 35mm Fisheye. The Fisheye is 180 degree FOV at infinity but a bit less at closer focus. Fisheyes do not fit in the typical focal length/ FOV formulas, probably because of their massive barrel distortion.
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