On Sharpness, ISO and Shutter Speed

Started Nov 29, 2013 | Discussions thread
Shop cameras & lenses ▾
Bernard Delley
Regular MemberPosts: 460Gear list
Re: Difference Between Horizontal and Vertical Readings
In reply to Jack Hogan, Dec 29, 2013

It would be harder to explain the A7/D610 V/H switch as a result of the shape of the 'fill' factor, since both sensors were designed by Sony and it is suspected that they come off the same fab line. And I am not sure how the CFA could cause such an effect, especially given how the MTF50 measurements are made off the white balanced raw data only.

The Bayer CFA and, if present the microlens array, are of very different material than the underlying 'silicon' sensor. So its brought up in registry in a later processing step. Obviously there are fabrication tolerances. I could imagine that a very slight displacement of the CFA would lead to a minor light spill and a concomitant reduction of edge contrast in that direction. The next batch has random other displacements inside the tolerance field.

This displacement is wild speculation. A serious discussion would need V/H data from several samples of a camera model.

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow