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04-26-2013, 11:36 AM   #1
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Pentax 67 500mm

Hi,
I want to buy a lens in the 500mm + range for Pentax 645 (with 67-Adapter) and for my future Pentax 67. Im am considering buying a Pentax SMC 6x7 1/5,6 500mm. My question - since the closest focussing distance of 8 Meters is not close enough for small birds etc, - did anyone use it with a Tele-Extender (brand?) or extension tubes? How does the lens perform with an tele-extender (Resultion, colour saturation, colour-fringing etc)? Is it possible to use it with extension tubes or is there the danger of vignetting? In some Pentax - list about their lenses and accessories, they say in the description of the extension tubes for Tele-lenses "for every Pentax 67 Tele-Lens except for the SMC 6x7 500mm". I canīt (i Dont want to) believe it... Anyone who used this lens with extension tubes or Tele-extenders, who is able to tell me about his or her experiences?
Thank you!
I am also considering a Pentacon 500mm lens, that had been converted for the Pentax 6x7. I know that this lens had been used with extension tubes and Tele-converters succesfully (i.e. with pictures, that are showing both great resolution and the lack of vignetting)..
Thank you for your reply!

04-26-2013, 03:26 PM   #2
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I have the 67 500mm and have used it with tubes, the 1.4x and the 2x; they work fine. I've even used the 500mm with the 2x and 1.4x on a K-5. Below is Venus passing in front of the sun, just at sunset. (Transit of Venus on June 5, 2012). You can see there is some CA.


04-26-2013, 11:36 PM   #3
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Thank you, Thomas. I can see, that 1,5x and 2x tubes are working. Now what about extension tubes? What is your impression about the picture quality in general? Thank you!
04-27-2013, 02:31 AM   #4
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QuoteOriginally posted by Thomas Quote
I have the 67 500mm
Wow someone who actually owns it?!?! I know this may be off topic but how is it on the K-5?

04-27-2013, 04:40 AM   #5
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Extension tubes are fully functional. The lens is fine on the K-5. It's a good lens but not a * lens. The above example was using the 2x and 1.4x at the same time; here's a scanned shot taken with film.

04-27-2013, 09:41 AM   #6
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With any telephoto from that era by Pentax (400 Takumar, 500 Pentax, 600 Takumar etc.) one must stop down a bit when using a rear converter. This is because you need to reduce the CA before it hits the converter, otherwise it will magnify it and make the image unacceptable. The 400 and 600 Takumar use the outer bay extension tubes, while the 500 uses the inner mount tubes.
04-27-2013, 01:23 PM   #7
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Thomas and desertscape,
Thank you for your helpful replies! I really know more about that lense. I have to choose between the Pentax 500mm lens and a Pentacon 500mm lens converted for the Pentax 67 mount. Thereīs quiete a lot of information and lots of sample photos concerning the Pentacon 500mm lens in the www, but almost nothing about the Pentax 500mm.
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