IQ on long adapted lenses?

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Auf Reisen Forum Member • Posts: 81
IQ on long adapted lenses?

I've been looking for a cheap option to get a little bit more reach for wildlife (birds and seals, mostly) with my EM10 II. I've been looking at the Commlite adapter (1) and a cheap EF-mount telephoto like the Canon EF 75-300mm f/4-5.6 III, or the Canon EF 100-300mm f/4.5-5.6 USM which are available used for 60-70 quid.

AF should work with the Commlite adapter, so should electronic aperture control.
I am aware that AF might be rather slow, but how reliable will it be? I could probably just use MF and focus peaking if worst comes to worst.

My question is: What kind of image quality can I expect from such a combination, especially at the longer end? Will it be comparable to the Olympus 40-150R or will it be noticably worse? I've heard some discussion about the resolution of FF frames not being sufficient for smaller sensors, but I haven't been able to make much sense of the discussion.
Does anyone have any other recommendations for affordable lenses with acceptable IQ that go up to 200-400mm?


 Auf Reisen's gear list:Auf Reisen's gear list
Panasonic Lumix G 20mm F1.7 ASPH
Olympus OM-D E-M10 II
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