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Forum: General Discussion Apr 9, 2010, 9:08 AM
Replies: 37
Views: 2,913
Posted By ac.smith
Yes, the A550 and A900 Sony seem to deliver...

Yes, the A550 and A900 Sony seem to deliver impressive (class leading) DR in jpeg. The A900 also seems to have much better than most raw DR while the A550 seem to be a bit less than the norm. I say...
Forum: General Discussion Apr 2, 2010, 1:57 PM
Replies: 37
Views: 2,913
Posted By ac.smith
Again you have two questions/comments. Pictures...

Again you have two questions/comments. Pictures of solar flares, sunspots and other solar features starts off with HEAVY filtration to get the absolute values into a range that can be handled with...
Forum: General Discussion Apr 2, 2010, 10:37 AM
Replies: 37
Views: 2,913
Posted By ac.smith
Absolutely, photographic technology can and has...

Absolutely, photographic technology can and has over it's history made visible what is not visible to the unassisted eye.

A. C.
Forum: General Discussion Apr 2, 2010, 8:49 AM
Replies: 37
Views: 2,913
Posted By ac.smith
Alan T Good to see you chime in, thanks. ...

Alan T

Good to see you chime in, thanks. As you can tell my issue with the original post was asking for a linear conversion on quantities we typically measure on a logarithmic scale. Nor has...
Forum: General Discussion Apr 2, 2010, 8:21 AM
Replies: 37
Views: 2,913
Posted By ac.smith
In a more simplified manner I caveatted the...

In a more simplified manner I caveatted the brightness (darkness) as you have. My choice of 9 magnitude as black was was based on the 7-8 being the dimmest object discernible in the darkest sky on...
Forum: General Discussion Apr 2, 2010, 7:58 AM
Replies: 37
Views: 2,913
Posted By ac.smith
Sorry, depending on memory and mental math. ...

Sorry, depending on memory and mental math. Looked again at DPReviews most recent tests. The best current jpeg engines across the board on 4:3, APS-C and full frame seem to deliver between 8.5 and...
Forum: General Discussion Apr 1, 2010, 2:21 PM
Replies: 37
Views: 2,913
Posted By ac.smith
It is not anywhere near as simple as you make it...

It is not anywhere near as simple as you make it out to be. The first problem is that you are asking for an answer on a linear scale (percentages) while we typically measure light photographically on...
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