The following objectives SP500 : after 55mm the 135mm. A short telephoto lens handy, cf. what I said about SMC Pentax-M 135mm f: 3.5 .
- Type: manual lens fixed focus
- Manufacturer: Asahi Pentax
- Model: Super-Takumar 1:3.5 / 135
- Focal Length: 135mm
- Holder Filter: 49mm
- Aperture: f/3.5 to 22
Comparison with SMC Pentax-M 135mm f: 3.5 shows the evolution of optical Pentax during the 1970s: they both have a filter holder 49mm (while the immediate successor of the SMC-Takumar, SMC Pentax (not M) bayonet was in 52mm), but the Takumar is more end, the tube being adapted to mount M42, narrower, and it is against the longer, have not benefited from advances in optics of the Pentax-M.
In terms of image quality, I have not noticed any obvious difference, in terms of convenience, note that the Pentax-M 135mm features a retractable sunshade, in-lens ;: the advantage of having a little more leeway in terms of size, I suppose. The Takumar was sold with a metal hood, but I noticed it caused a significant vignetting of the images: it is too long, while the literature gives the Pentax as suitable for this purpose ... 'll Understand.
Note on the right picture, some features of the draft final optical Asahi Pentax screw: the small pin that protrudes into the frame. When the lens is mounted, the housing press stud is now open aperture, it's only permanently active when the cell to measure light that the diaphragm is released. On the side near the frame, button, zipper Auto / Man : it only serves to disengage the previous mechanism, where we mount the lens on a box of another brand which the spike clutch would end down permanently. Obviously, given in 2008, the reference Auto let wait much more ... The charm of old equipment!
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