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04-18-2009, 06:14 AM   #1
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6x7 SMC Takumar 400mm F4.0

Does anyone have experience with this lens? do you think it will do well with a 6x7 to K adapter and AFA 1.7x teleconverter for a 680mm F6.8?

let me know

04-18-2009, 09:04 AM   #2
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Mike:

I have no experience shooting this lens, but I have regularly been shooting 3 other 67 lenses on my K20. The results are very good---look here if you have not already https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/49428-medium-f...tml#post561155

Also, there is some data on the 6 x 7s here Antique and Classic Cameras The lens is a very good performer and I'd be willing to bet it does great on a Pentax DSLR. If you decide to shoot this setup, please post some pics in the 67 Medium Format to DSLR link provided above--thanks. Here is a shot, no PPing, with the 6 x 7 165mm 2.8 and Tammy 2x Tele:

Last edited by Jewelltrail; 09-25-2009 at 09:08 AM.
04-18-2009, 08:58 PM   #3
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It is so hard to hit the buy button... its too expensive to just buy and try but it seems like a good price for what it is
04-18-2009, 11:32 PM   #4
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QuoteQuote:
MightyMike
It is so hard to hit the buy button... its too expensive to just buy and try but it seems like a good price for what it is

How much are you talking? There really are no bad 67 lenses. The only downside I see for this focal length is the weight, but you would be mostly shooting on a tripod anyway, especially with the tele hookup. Let us know how you do?

04-18-2009, 11:39 PM   #5
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Tripod... i've never shot any telephoto from a tripod unless it was a uniques situation... SR is a great tool and i've hand held my Sigma 100-300mm F4 with 2x teleconverter with no issues... i can't track a plane or bird in flight with a tripod. my decision to buy or not to buy is coming but i have to be sure.
12-26-2011, 01:53 AM   #6
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I have the combo that the OP is asking about and it suffers from some serious front focusing issues on my K-7. Is there any way to prevent / fix this aside from the in-camera AF adjustment?
12-26-2011, 05:10 AM   #7
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I have the 400mm f4 6x7, it's quite heavy on CA even stopped down. I much prefer my A series 400mm f5.6 which provides much better results and is a hell of a lot lighter.
12-26-2011, 12:07 PM   #8
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QuoteOriginally posted by littledrawe Quote
I have the combo that the OP is asking about and it suffers from some serious front focusing issues on my K-7. Is there any way to prevent / fix this aside from the in-camera AF adjustment?
A manual focus lens does not have "focusing issues". You should not rely on the AF indicator; it's useless with MF lenses. Buy yourself a good manual focus screen.

12-26-2011, 06:42 PM   #9
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QuoteOriginally posted by Asahiflex Quote
A manual focus lens does not have "focusing issues". You should not rely on the AF indicator; it's useless with MF lenses. Buy yourself a good manual focus screen.
There is also the F 1.7X AFA the OP mentions so there is an autofocus component, unless the 1.7X is not capable of front or back focusing, in which case it is operator error and I just need to improve. Could the autofocus adapter cause front/back focus?
12-26-2011, 06:50 PM   #10
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QuoteOriginally posted by xjjohnno Quote
I have the 400mm f4 6x7, it's quite heavy on CA even stopped down. I much prefer my A series 400mm f5.6 which provides much better results and is a hell of a lot lighter.
I would love less weight, but wanted more reach and the ability to use the 1.7X AFA which I would not be able to do with a max aperture of f5.6. This was the most cost effective lens I found longer then the 300mm I had previously with the aperture I needed.
I would love to sell the 1.7x and get an A*600mm but I need some more cash.
12-27-2011, 06:32 PM   #11
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If you want that kind of reach at an affordable price with reasonable IQ I'd suggest the Tamron SP300 f2.8 with their BBAR 2x converter. Even if using your x1.7 after the adaptall PKA mount would get you reasonable distance plus IQ that I doubt you will get from the 400mm 6x7.
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