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Discussion in 'Adapted Lenses' started by BAKatz, Sep 25, 2016.
Has anyone seen or have this lens ? About $150 on E-Bay. This was the first time I've seen it.
Did some research and found out this is called Digiscoping. The above lens gets, mixed reviews. More poor than good. Also found out spotting scopes can be costly.
According to multiple sources it has 70mm aperture and 1200-3600mm focal length.
This means f/18 - f/48 lens. It's totally pointless from so many reasons - not enough light, low contrast, diffraction limit, absurdly small field of view, optical aberrations, atmospheric distortions etc.
There are some good spotting scopes usable for photography but this isn't one of them.
It's not dissimilar in spec to my Tasco World class scope (1000-4000mm). I paid £60 for mine used (with some accessories), I guess it might be worth that, but it wasn't a bargain in hindsight.
On a solid tripod and with a DSLR my scope is just about usable at 1000mm, IIRC its F/16 there so only slightly suffering from diffraction. Zoomed in its F/64 and TOTALLY useless for a camera. It is acceptable throughout the range from use as a telescope. Perhaps I should give it a try via a focal reducer sometime...
For µ4/3 my 600mm mirror lens is far more usable (cost about the same), but even that sort of FOV seriously needs support, it's just too highly magnified to hold steady. I find it works quite well on a focal reducer instead of a 1200mm f8, it's more like a 900mm f5.6 which can be handheld if required