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500mm mirror on Quattro

Started Jul 26, 2018 | Discussions thread
atom14
atom14 Veteran Member • Posts: 3,301
Re: 500mm mirror on Quattro

Not too bad, considering. I used to use a Tamron 500mm f/8 mirror lens on film cams. I tried it on the SD1M but ABSOLUTELY couldn't hold it still enough anymore . I soon swapped back to the Σ50-500 with OS. It was hard to tell, but I think the latter was slightly crisper wide open (f/6.3) than the Tamron.

The sharpest mirror lens I've ever used (borrowed) was a Russian MTO 1000 (I think). It was 1100 mm at f/10 or 11.

That off-axis aperture mask is useful for some applications, but the amount of light-loss is reason to weep. I had a black cardboard version, then made a double aperture version to aid in critical focusing. I took it off to take the picture.

atom14.

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