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03-20-2007, 09:21 AM   #1
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This may have been discussed and I missed it, but..

..what specific adapter does it take to use the medium format lenses on a K10D? There appear to be some seriously good prices at KEH on primes for the Pentax medium format ones and since the Limiteds are essentially non-existent at the moment, these appear to be a good option.
Also, anyone using any of them care to suggest which might be the better ones to get? This might become a whole sub-topic of it's own, Mo! "What optional Pentax lenses from the medium format cameras are good replacements for hard-to-get 35mm lenses?"

Rob W

03-20-2007, 09:27 AM   #2
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I think you are referring to the Takumar lenses. You'll be looking for a screwmount adapter in this case. Don't have any links, but I'm sure people will post it before I can edit this.
03-20-2007, 09:43 AM   #3
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Pentax made a 645 to K-mount adapter. There was one a in a local store that I passed on a few months ago - big mistake. I've seen some very nice on 645 lenses in the last little while.

On the "other" forum a while back, someone posted photos taken with a 645 300mm lens that looked quite good
03-20-2007, 10:02 AM   #4
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It's the "big gun" primes like the 300mm/f4 that have me drooling! The 645 version in Ex+ condition is less than $700 at KEH and they have 4! I don't know enough about the older lenses to know which are good and which are stinkers, but if I can find the proper adapter for a reasonable price, I'm willing to investigate the vast pool of 645 lenses as an optional source to satisfy my LBA!

Rob W

03-20-2007, 10:07 AM   #5
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Part # 38455

You can order it from Pentax direct for $235.00. They are out of stock right now but it is still being manufactured. The phone # is 800-877-0155. B & H sells it for $159 but you must order and wait. They show up at KEH sometimes and are listed under "Pentax medium format- 645- miscellaneous" when they have them. I don't remember what the FOV is when using 645 lenses on an APS-C sensor.

Regards,
03-20-2007, 10:18 AM   #6
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I stand corrected. Here's what I found.

645-K mount adapter
http://kmp.bdimitrov.de/lenses/adapters/645.jpg

6x7-K mount adapter
http://kmp.bdimitrov.de/lenses/adapters/6x7.jpg
03-20-2007, 10:53 AM   #7
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QuoteOriginally posted by regken Quote
I don't remember what the FOV is when using 645 lenses on an APS-C sensor.
It doesnt matter how big the mount is. The FOV is a function of the focal length and sensor size. A 300mm lens designed for ANY sized sensor will produce the same FOV on the 16x24mm sensor.

So, if you are used to 35mm FOV, you can compare the 300mm FOV on your pentax DSLR to a 450mm lens on your old 35mm film camera.
03-20-2007, 11:18 AM   #8
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QuoteOriginally posted by kmccanta Quote
It doesnt matter how big the mount is. The FOV is a function of the focal length and sensor size. A 300mm lens designed for ANY sized sensor will produce the same FOV on the 16x24mm sensor.

So, if you are used to 35mm FOV, you can compare the 300mm FOV on your pentax DSLR to a 450mm lens on your old 35mm film camera.
So what is the FOV of a 200mm 645 lens on a K10 in terms of 35mm lens FOV?

Regards,

03-20-2007, 11:29 AM   #9
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QuoteOriginally posted by regken Quote
So what is the FOV of a 200mm 645 lens on a K10 in terms of 35mm lens FOV?
200 mm on 36x24 has a HFoV of 10 degrees.

200 mm on 60x45 has a HFoV of 17 degrees, which is the same as a ca. 120mm lens on 36x24 gives.
03-20-2007, 11:44 AM   #10
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QuoteOriginally posted by regken Quote
So what is the FOV of a 200mm 645 lens on a K10 in terms of 35mm lens FOV?

Regards,

If you stick a 200mm 645 lens on a K10D, it will have the same FOV of a 300mm lens on a 35mm film camera.
If you stick a 200mm 35mm lens on a K10D, it will have the same FOV of a 300mm lens on a 35mm film camera.
If you stick a 200mm 6x7 lens on a K10D, it will have the same FOV of a 300mm lens on a 35mm film camera.


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