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10-29-2007, 10:27 PM   #1
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Pentax M42 lens adapter

Hi,

I have the Pentax made M42 lens adapter for my K10D and I have a few Takumar's. I found a Takumar SMC 67 ( 90㎜/F2.8) for a pretty good price but was wondering if the 6x7 is compatible with my adapter?

Also, if I wanted to buy other branded M42 lenses, such as Jupiter-9, Helios-44, Carl Zeiss Sonnar & Flektogon, etc, would I have to get a different adapter?

Cheers

10-30-2007, 05:11 AM   #2
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QuoteOriginally posted by figmental1978 Quote
Hi,

Also, if I wanted to buy other branded M42 lenses, such as Jupiter-9, Helios-44, Carl Zeiss Sonnar & Flektogon, etc, would I have to get a different adapter?

Cheers
M42 is M42 no matter who makes them.
10-30-2007, 06:39 AM   #3
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short and sweet, thanks mate
11-06-2007, 09:48 AM   #4
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QuoteOriginally posted by figmental1978 Quote
Hi,

I have the Pentax made M42 lens adapter for my K10D and I have a few Takumar's. I found a Takumar SMC 67 ( 90㎜/F2.8) for a pretty good price but was wondering if the 6x7 is compatible with my adapter?
Cheers
It would seem no one responded to the first part of the question so I'll give it a try...

So far as I know 6x7 or 67 lenses are not compatible. They're made for the medium-format Pentax and other cams.

11-06-2007, 10:20 AM   #5
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Pentax | 67 Lens to Pentax 35mm K-Mount Body Adapter | 37954
11-06-2007, 11:53 AM   #6
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Thanks Nesster - Ididn't even know they existed. Which 67 lens would interest an slr user, I'm curious.
11-06-2007, 02:46 PM   #7
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QuoteOriginally posted by JCSullivan Quote
Which 67 lens would interest an slr user, I'm curious.
It depends on the user. If I had a 67 system and I could get the adapter cheap, I might play around with it, but if I had to buy everything (lens included) I wouldn't bother for the simple reason that a lens designed for medium format won't be as sharp as a lens designed for 35mm (or APS-C). A large format lens will perform even worse. I can't remember where (Popular Photography maybe?) that I read it, but tests were done that showed that as the native format that a lens was designed for got larger, the resolving power of the lens decreased, but a print at typical viewing distance looked sharper because it required less enlargement.

Now that I think about, a 90mm or 105mm might make a nice portrait lens, but I'm sure there are less expensive ways to get the same effect.
11-07-2007, 07:42 AM   #8
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The way I like to think of the resolution requirements: when the storage size (negative or sensor size) gets smaller, everything else has to get correspondingly smaller.

Imagine a lens that resolves 30 lines per cm.

Imagine this lens is projecting to a 10cm wide piece of film - and you're shooting something that has 100 lines spread out evenly through the frame. That translates to 10 lines per cm that need to be resolved on film. 30 lines per cm is plenty to accomplish this.

Now imagine the same lens is projecting to a 1cm wide piece of film. The same shot now requires all 100 lines to resolve into 1 cm. Suddenly the 30 lines of resolution this lens has is woefully inadequate.

Then, if you enlarge both negatives to say 20cm wide, it all gets even worse...

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