Bryan's New Photo Blog

Just to prove that it can be done, here's an example of the Canon EOS fit Sigma 100-300 f4, at 300mm, mounted using a Commlite adapter, on a Sony a6500 APS-C camera. The effective focal length is 450 mm, and the aperture used f10. The assembly was mounted upon a tripod. OK a particularly uninspiring subject, the view from our bedroom window, but that's not the point! The entire image (click for a larger image) An actual pixels crop from the extreme left side of the image. Given the distance involved and the atmospheric conditions I think that's pretty good, certainly usable.

I possess two Canon DSLRs and two Sony mirrorless compact system cameras. The big full frame Canon I find too heavy to carry around, and, outdoors,  I tend to use the Sony most of the time. However I have a small collection of good Canon lenses that might be useful on the smaller camera. You can buy cheap adapters to fit Canon lenses to Sony cameras, but they do not allow adjustment of the lens aperture, auto focus, or in lens image stabilisation. Alternatively you can spend rather a lot of cash and buy a top of the range adapter, e.g. Metabones, which will give full electronic contact between camera and lens. I don't think that I will be making that much use of my Canon lenses on the Sony, as carrying heavy full frame lenses rather defeats the purpose of using a lightweight compact camera. However I would like to make occasional use of them, possibly in connection with a tripod, and the lens that I would particularly like to fit is my Sigma  APO 100-300 f4 . I used t...