Sigma 50mm ART Astrophotography Test

Started Jun 7, 2014 | Discussions thread
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Franz Kerschbaum Contributing Member • Posts: 528
Sigma 50mm ART Astrophotography Test
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Wanna share my quick and personal test for the best aperture of my new Sigma 50/1.4 ART on my astro-modified canon eos 5DII. The pics are showing stripes (centre and below extreme corner lower right) with apertures from 5.6, 4, 2.8, 2, 1.4 with equivalent exposures between 160-10s. raw developed in DXO with vignetting and distortion switched off! My personal conclusion: vignetting invisible at 2.8, perfect sharpness and aberrations at 4.0 but already very good and quite usable for astro work at 2.8 - this is two stops better than my 50/1.2 copy...

(the strange color comes from the UHC clip in filter and the high background)

centre (5.6-1.4) , 100%

corner (5.6-1.4) , 100%

 Franz Kerschbaum's gear list:Franz Kerschbaum's gear list
Canon EOS 5D Mark II Canon EOS 5D Mark III Canon EOS 7D Mark II Canon EOS M6 Canon EOS R +7 more
Canon EOS 5D Mark II Sigma 50mm F1.4 DG HSM | A
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