Hi Martin,
My understanding is that most modern lenses don’t focus exactly at infinity - particularly if it is not a fixed focal length design.
That sounds strange as they’re both the same chip although you have different distances to space correctly. Interested to hear the results I’ve got a 2600mc on the way with EF adapters so it sounds a little alarming - the zwo options looked like they had their adapters in order more so than qhy (probably due to more room to play with in the spacing).
Cheers
Russell
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