Spring Flowers using the Sigma 24-105mm F4 DG (OS) HSM and the the Sigma 70mm F2.8 EX DG Macro lens

Started Jun 8, 2014 | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 12,059
A Caveat . .

Nancy and Pete Spader wrote:

Thanks for the good advice. We find +0.3 to be a good general setting, but you are correct, no setting is good for everything. We will try the -1 range for these types of flower shots. Yes, we have used iso100 to allow us to get better DOF and really should have done so with this closeup shot. I was doing things faster than I should have and whenever you are doing things undeer time pressure you forget things.

Thanks again, Vince

Good advice indeed, provided that the problem being avoided is "burnt out" colors caused by sensor saturation in one or more of the layers.

The Caveat

Since color rendition is so important in flower shots, another problem is color saturation in the scene itself - leading to color clipping when the captured image is transformed eventually into sRGB for posting. Color clipping, in extremis , causes false colors - or it caused the far more subtle effect of a flat appearance in highly saturated color areas. Here's an exaggerated illustration of that flat appearance taken from a X3F which was axtually quite under-exposed (about -1EV):

Saturation adjusted in PhotoPro Working space then 'saved as' sRGB. +0.7 at left, -0.3 at right

Of course +0.7 sat. was a bit much but this X3F, when saved as zero sat. sRGB, showed color clipping in ColorThink even though it was originally underexposed -1EV (according to RawDigger).

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Cheers,
Ted

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