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02-18-2020, 10:27 PM   #1
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Pentax 6x7 lenses on 645Z?

I have an old Pentax 75 and 200. Also a newer 165 f2.8. A thread on 200's doesn't speak very highly of the 6x7 200 on the 645Z. Do my 75 or 165 warrant buying a 645 to 6x7 adapter?
Thanks,
barondla

02-18-2020, 10:45 PM   #2
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Which 75mm?
02-19-2020, 01:41 AM   #3
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Both 75s (ignoring the shift lens) are sharp, the f/2.8 AL is preferred but the f/4.5 is a very good lens (I haven't tried it on my D). I have the second and third versions of the 200/4 and have no issues with either on the D (the 3rd version is apparently preferred but I haven't noticed a significant difference). For me, the 200 is a more useful focal length than the 75.

I'd buy the adapter (although I have more 67 lenses) it works seemlessly in M & Av with open aperture metering, although I'd probably price up a 645 FA 45-85 first which is a very good 35-70 equivalent.
02-19-2020, 06:06 AM   #4
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In general, there are the Takumars, Pentax 6x7 and Pentax 67 generations of the lenses. Only a few of lenses were optically updated between the Pentax 6x7 and the Pentax 67 generations of the lenses which the 200mm was one of them. The optics were unchanged between the S-M-C Takumar 75mm and the SMC Pentax 67 75mm.

02-19-2020, 06:27 AM   #5
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You should definitely get the Pentax 67 to 645 adapter. You can use 67 lenses in automatic exposure mode (Aperture preferred) on 645 bodies. I use my 75 mm f/2.8 AL and my M*300 mm f/4 ED this way with good success (the 300 is a massive and heavy lens but has a tripod shoe). I amassed ten 67 lenses over the years (45, 55, 75, 90, 100 macro, 105, 165, 200, M* 300 and 55-100 zoom, all late models 67) but have only tried these two on my 645Z yet ...

Last edited by RICHARD L.; 02-19-2020 at 06:40 AM.
02-19-2020, 06:46 AM - 1 Like   #6
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A couple of examples with the 2nd & 3rd 6x7 200 F/4 lenses on the Pentax adapter (direct from the raw file with no PP other than re-sizing and JPG-ing).

2nd version: Pentax 645D, S-M-C Takumar 6x7 200mm F4, ISO 200 @ 1/500th:
Please forgive any manual focussing errors on a subject moving fast towards the camera!
S-M-C Takumar 6x7 / Super Takumar 6x7 200mm F4 Reviews - 67 Telephoto Primes - Pentax Lens Reviews & Lens Database


3rd version: Pentax 645D, SMC Pentax 67 200mm F4, ISO 200 @ 1/180th:
SMC Pentax 67 200mm F4 Reviews - 67 Telephoto Primes - Pentax Lens Reviews & Lens Database
02-19-2020, 09:10 AM   #7
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Original Poster
QuoteOriginally posted by pentaxus Quote
Which 75mm?
Metal focusing ring, f4.5 75mm.
Thanks,
barondla

---------- Post added 02-19-20 at 10:15 AM ----------

QuoteOriginally posted by johnha Quote
A couple of examples with the 2nd & 3rd 6x7 200 F/4 lenses on the Pentax adapter (direct from the raw file with no PP other than re-sizing and JPG-ing).

2nd version: Pentax 645D, S-M-C Takumar 6x7 200mm F4, ISO 200 @ 1/500th:
Please forgive any manual focussing errors on a subject moving fast towards the camera!
S-M-C Takumar 6x7 / Super Takumar 6x7 200mm F4 Reviews - 67 Telephoto Primes - Pentax Lens Reviews & Lens Database


3rd version: Pentax 645D, SMC Pentax 67 200mm F4, ISO 200 @ 1/180th:
SMC Pentax 67 200mm F4 Reviews - 67 Telephoto Primes - Pentax Lens Reviews & Lens Database
Thanks for your info filled post. This gives me more to consider. Since the 165 and 200 aren't that far apart in focal length I'd probably only carry one, whichever performs the best on the 645Z.
Thanks,
barondla
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