Favorite cameras for adapted lenses

Started 3 months ago | Discussions thread
ProfHankD Veteran Member • Posts: 6,866
Re: BSI sensor

ThomasB wrote:

Belgarchi wrote:

I would like to know why BSI sensors are better with old lenses.

Here is the explanation:

BSI increases the active area as well as avoiding burying the detector in a deep hole, but that mostly just means it depends less on microlens qualities. The microlenses are still an issue, as is cover glass thickness.

The microlenses are cr*ppy, single-element, lenses, and they don't really focus all the colors to the same spot. You can tune the microlens placements (i.e., not have them regularly spaced) to compensate for rays coming in at unfortunate angles, but that only helps when the rays are as expected.

Thick cover glass actually does at least as much harm if it isn't modeled in the lens design... especially involving CA. Old lenses don't expect 4mm of glass in front of an MFT sensor. 

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