Register · Search · Software · Join Upload & Sell · Hosting

	Moderated by: Fred Miranda
	Username   Password FM Forum Rules FM Forums | Alternative Gear & Lenses | Join Upload & Sell    Search Used end    Archive 2009 · Different manufacturers colour casts

foxbat Offline Upload & Sell: Off p.1 #1 · Different manufacturers colour casts I thought I'd have a go at quantifying the colour casts given by lenses of different manufacturers by testing them all side by side against a known reference point using my 450D. The reference shot used for setting the custom white balance was taken with no lens attached to the camera. Subsequent shots where taken with each lens at the same exposure. The crop on the left shows the actual cast as you would see it against pure white. The crop on the right shows an exaggerated view of the cast, basically +80% saturation of the crop on the left. The Tak has the strongest warm cast by far with the Sigma coming runner up. Looks like the Zeiss and Leica are about the closest to neutral with the Zeiss sitting on the warm side and the Leica on the cool side. Jan 02, 2009 at 06:46 PM

sworth Offline Upload & Sell: Off p.1 #2 · Different manufacturers colour casts You can't compare hues unless the shades are evened out. The only ones there that seem to have a really different hue are the Oly and the Leica. And even then, the color of the lighting situation you are shooting under will have MUCH more influence on the colors of the shot than that slight cast to the optics. If you want to really compare colors, shoot a full spectrum of shades and hues along with neutral gray scale and even out the brightness, contrast and saturation before you compare them. Make sure the neutral gray scale is the same on all of them, THEN you'll see if there is a color difference. Jan 02, 2009 at 07:27 PM

G. Thomas Offline Upload & Sell: On p.1 #3 · Different manufacturers colour casts Isn't white already composed of the full spectrum? Jan 02, 2009 at 08:11 PM

foxbat Offline Upload & Sell: Off p.1 #4 · Different manufacturers colour casts sworth wrote: You can't compare hues unless the shades are evened out. The only ones there that seem to have a really different hue are the Oly and the Leica. And even then, the color of the lighting situation you are shooting under will have MUCH more influence on the colors of the shot than that slight cast to the optics. If you want to really compare colors, shoot a full spectrum of shades and hues along with neutral gray scale and even out the brightness, contrast and saturation before you compare them. Make sure the neutral gray scale is the same on all of them, THEN you'll see if there is a color difference. The test target was plain white paper, the lighting was constant and used to set a custom white balance with no lens attached. The shots were processed by taking a center crop then doing Filter -> Blur -> Average to get the overall cast. Then converted to LAB and the brightness equalized by setting the white input point of the L channel to the far left (that leaves only the colour set against pure white). Jan 02, 2009 at 09:15 PM

foxbat Offline Upload & Sell: Off p.1 #5 · Different manufacturers colour casts Does anyone find any of the results surprising? It's been said many times over that Sigma lenses have a yellow cast and I can certainly see that here. Zeiss producing slightly warm colours and Leica slightly cool is also something I expected to see before doing this test. Jan 02, 2009 at 09:21 PM

Daniel Buck Offline Dedicated FM Upload & Sell: Off p.1 #6 · Different manufacturers colour casts doesn't seem surprising to me, different coatings on the glass will give slightly different results. And possibly the type of glass used too? not sure about that though. Jan 02, 2009 at 11:35 PM

trumpet_guy Offline Dedicated FM Upload & Sell: On p.1 #7 · Different manufacturers colour casts Nice test, Andy. I have noticed a slight yellow cast with Sigma's lenses, but nothing problematic in practice. I expected a cool cast with Zeiss glass, as that's what I feel I get with CZ lenses on my Canon bodies. Nice to see the Zeiss T* coatings are delivering very neutral images. Jan 03, 2009 at 04:12 AM

Andrew Gough Online Upload & Sell: On p.1 #8 · Different manufacturers colour casts trumpet_guy wrote: Nice test, Andy. I have noticed a slight yellow cast with Sigma's lenses, but nothing problematic in practice. I expected a cool cast with Zeiss glass, as that's what I feel I get with CZ lenses on my Canon bodies. Nice to see the Zeiss T* coatings are delivering very neutral images. +1 Nice test, and very accurate too. Cheers Andrew Jan 03, 2009 at 03:02 PM

jcolwell Offline Dedicated FM Upload & Sell: On p.1 #9 · Different manufacturers colour casts Thanks for the test. I bet the SMC Takumar would have been a much more neutral hue when it was younger - many of the Taks (like my Super Takumar 50/1.4 on the right below) get a very yellow cast as they age - you can clearly see it. There are two ways to "fix" a yellow Tak (1) expose it to a lot of UV light (direct sunlight will do), or (2) http://www.hermes.net.au/bayling/repair.html. Jan 03, 2009 at 04:16 PM

	FM Forums | Alternative Gear & Lenses | Join Upload & Sell end

You are not logged in. Login or Register

Username   Password   Lost your password?