What is holding Sigma back with the new Merril(s)?

Started 5 months ago | Discussions thread
mike earussi Veteran Member • Posts: 9,127
Re: What is holding Sigma back with the new Merril(s)?

Tom Schum wrote:

mike earussi wrote:

Tom Schum wrote:

mike earussi wrote:

xpatUSA wrote:

D Cox wrote:

A 20 Mpix Foveon is not enough for 24x36mm.

76 lp/mm at the sensor would be good enough for any lens except an Otus mebbe.

I've printed 24x36 images from my 14.7mp Merrill that look excellent when using Topaz Gigapixel AI (in Architectural mode) to enlarge the file. BTW, Foveon files uprez very well, much better than Bayer.

It would be interesting to find out if Topaz Gigapixel would do well with a fp L file that has been downsized to 1/4 original pixels. The quality of these pixels ought to equal that of the Merrill, pixel for pixel, should it not?

No, a Merrill sensor will still look different because of how it determines color. You'll have better DR with the Bayer but poorer color variations.

Sigma knows how to determine color from a Foveon sensor, so they might be able to get a close match for it with special processing of a Bayer image. Or am I guessing wrong here and it is impossible?

It's a property of the silicon filtration vs. colored gels, not just a different way of processing the information from the chip. Gels are more limited in their color discrimination than silicon is. Bayer is always going to look like Bayer, it's just the nature of the technology regardless of software.

TANSTAAFL,  everything is a tradeoff. If you want the high iso, better DR and higher pixel count of a Bayer you have to trade off color discrimination (not accuracy, which is different).

This is one of several reasons I am becoming interested in the fp L.

 mike earussi's gear list:mike earussi's gear list
Sigma SD1 Merrill Sigma 105mm F2.8 EX DG Macro Sigma 17-50mm F2.8 EX DC OS HSM Sigma APO Macro 180mm F2.8 EX DG OS HSM Sigma 70mm F2.8 DG Macro Art +1 more
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