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Old 15-04-2012, 05:23 PM
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gregbradley
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Quote:
Originally Posted by midnight View Post
The dark lanes certainly stand out there Lester which gives it some nice contrast.

Give Jjj's advice a go. I find F4 a nice stop on my 50mm.

Crux is certainly one of those southern gems!

Darrin...

PS Greg, would stopping a F1.2 lense down to say F4 help resolve the magenta problem or this a characteristic of a very fast lense that stopping down can't really resolve to a great extent (at least in relation to Lester's image)? Just out of interest.

It may help for sure. Those Photozone lens reviews often comment about sharpness of lenses and very few lenses are sharp to the corners wide open in full frame cameras. Same with chromatic aberration.

How much better is a matter of trial and error though. I have noticed though that the longer the focal length of the lens the less this seems to be an issue.

It certainly reduces other aberrations like coma which is often seen at fast f-ratios.

If you work your way through your lenses you'll find the sweet spot for each. Fortunately the magenta star issue corrects quite well in Photoshop.

Greg.
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