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StuTodd
06-12-2017, 12:18 PM
I'd like to do widefield imaging using a Takumar 135mm coupled to FW and Atik 414 mono camera.

Would you go for a medium format lens over a standard 35mm lens? Is the M42 thread pitch the same (is it 1mm or 0.75)?

Stu

Atmos
06-12-2017, 12:32 PM
I’d look at the Samyang 135mm F/2. Very sharp, excellent coma control and good colour correction.

StuTodd
06-12-2017, 05:07 PM
They're $450 US plus though :scared2:
I can get a 35mm Takumar for $30..and the 67 format one for $150 or so.

thebonz
06-12-2017, 05:46 PM
In my day the takumar 135mm f3.5 was a very slow lens that had to be stopped down to f8/11 to yield sharp results. 35 mm format I would avoid. The medium format lenses however is a different story

Merlin66
06-12-2017, 05:58 PM
Iíve had good success using the olí Takumar telelenses in various spectroscopes. M42 x 1mm threaded connections.
Well worth trying.....

StuTodd
07-12-2017, 09:50 AM
Ok thanks chaps.
Gutted I sold my Pentax 67 kit now but I'll go for the 6x7 lens as I guess there will be a larger "sweet spot" and more back focus leeway for filter wheel etc..

JA
07-12-2017, 10:31 AM
Given the size of the 414's sensor , some 6 x 6mm, unless you want a longer flange focal distance, I wouldn't go for medium format lenses, esp, vintage era with potentially lower spec glass and the potential to amplify optical aberrations more, compared to new-ish fullframe or APS-C lenses, which now will routinely use ED glass and modern multicoating and modern optical design and manufacturing methods.

Best
JA

StuTodd
08-12-2017, 06:32 AM
Thanks Ken and JA, food for thought...:question: