How to differentiate Sensor Bloom and CA.

bawang · Joined: 26 Mar 2008 Posts: 548 Location: Indiana, USA

Can someone show & explain to me the difference between Sensor Bloom and CA (purple fringing)? I have been seeing more of the purple thingy since I got the 500D. I have been using it extensively with the CZ 35-70/3.4. So I am not sure if the purple thingy is caused by the lens or the tiny sensor/pixel of 500D.

Perhaps the knowledge of the two will help me to properly identify which is which and hopefully teach me how to avoid situation in which they are more prone to happened.

Thanks.

bawang · Joined: 26 Mar 2008 Posts: 548 Location: Indiana, USA

Google is a friend indeed.

I found an explanation here.

http://www.dpreview.com/learn/?/key=blooming

http://www.dpreview.com/learn/?/key=chromatic+aberration

Based on what I understood, the purple thingy I have been experiencing *could* have come from the sensor itself, not sensor bloom, but purple fringing caused by the micro-lenses on the sensor itself.

Time for more testing...I guess. In the meantime, I would like to see more samples showing the purple thingy from members here.

no-X · Posted: Mon Jun 08, 2009 7:17 am Post subject:

It's simple. Blooming has never a color tint. Purple fringe is a form of CA (axial CA) - sensor bloom can it make a bit more visible, but it isn't the cause of this problem.

This is one of the best articles about these problems:

http://toothwalker.org/optics/chromatic.html

Xpres · Expire: 2014-10-28