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08-07-2020, 01:59 PM   #1
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Medium format 6 x 7 question

Do these fit the K-1?

I see a lot of cheap 300 mm lenses, which I am in the market for.

I won't pay the $700 for an APS-C version of F3, 300.

08-07-2020, 02:57 PM - 1 Like   #2
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Hi,

Pentax made three adapters, that I am aware of.

(i) 6x7 or 67 to 35mm
(ii) 6x7 or 67 to 645
(iii) 645 to 35mm

These are all manual adapters so yes you can use your 300mm 6x7 or 67 lenses on your K1 with the appropriate ad adapter and the results are well worth the trouble!

Regards,
Gordon.
08-07-2020, 03:00 PM - 1 Like   #3
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QuoteOriginally posted by condor27596 Quote
Do these fit the K-1?

I see a lot of cheap 300 mm lenses, which I am in the market for.

I won't pay the $700 for an APS-C version of F3, 300.
You need a 6x7 to K adapter. The lens will work fine, but full manual control as there will be no mechanical linkage between the lens and body.
This means focus wide open, stop the lens down to the desired aperture and then use the green button in manual function to set an appropriate shutter speed.
08-07-2020, 03:07 PM   #4
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Is it adapter K to 6x7 lens $100 on ebay.? There are 1000 choices.

08-07-2020, 05:44 PM - 1 Like   #5
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I 3d printed this one I think: Pentax 6x7 K mount adaptor by simonpw - Thingiverse

it works fine
08-08-2020, 08:06 AM   #6
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The 6X7 300 mm f/4 lenses you see listed used for 100 $ are the old 5 element model. It weighs a ton, has no tripod mount and suffers from severe chromatic aberrations. I don't think you would like it. Check the "Lens Reviews" on this Pentax Forum before spending any money. The newer 67 M* 300 mm f/4 is stellar but will cost 1000 $, not 100 $.

Regards
08-08-2020, 11:42 AM   #7
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I would not cantilever the 6x7 generation of the 300mm lens off your camera. And like Richard said it does not have a good reputation among medium format cameras. I can't say what it would be like on your camera. It's most likely not a lens you'll want to carry around.

The M* version of the 67 300mm is a sweet lens but you'd get the same results with a much more compact A* 300/4 lens given a choice.
09-04-2020, 03:07 PM   #8
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If you are going to use the 300mm (6X7) hand held, then you could get away with using it. I don't agree with the above post that it has severe chromatic. I used one for 20 years and found that only wide open and f/5.6 could you see a problem and only in high contrast situations. Using this lens on a tripod would be a mistake.

11-24-2020, 06:32 PM   #9
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I have the 6x7 300mm (early version) and it makes the 6x7 200mm look positively stellar by comparison, both in terms of handling and image results. In truth, the 300 is marginal if only because it is such a lump compared to its modest optical performance in my experience.
11-25-2020, 09:53 AM   #10
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Better go to the Gym to build arms and shoulders if you want to use the old 6X7 300 mm lens handheld. I had one and got rid of it to acquire a newer 67 M* 300 mm f/4 with a tripod-mount : a World of difference !

Regards

Last edited by RICHARD L.; 11-25-2020 at 12:57 PM.
02-18-2021, 05:58 AM   #11
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I see this thread is already a couple of months old and you may have resolved the issue already.

I'll risk a suggestion or two: You get a FF 300mm f4.5 F* lens on eBay for anything from $300 to $1000. The lens has a few characteristics to get used to, but is fantastic to use, super light and small, built-in hood, Sharp as you can get and autofocus. You need to get used to the way you switch from autofocus to manual focus. It needs the camera switched to auto and manual correspondingly, otherwise it does not disengage the focusing motor. Easy to learn and not an issue afterwards. The only other characteristics I know of, is it does not play well with ibis and it does not like to shoot into the sun. If you can figure out your personal workarounds for these issues you will never part with this lens. It also has a removable tripod mount.

Another lens in the same category is a 400mm f/5.6 FA* slightly bigger, does not have the special needs of the 300mm and also tack sharp. Highly recommended, and not too expensive on eBay.

Hope you get a solution that works for you.

Last edited by TDvN57; 02-18-2021 at 06:11 AM.
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