Rikenon 50mm F1.4 color rendition on NEX-7

[AlexTheCat]

I'm trying out various lenses on an NEX-7. The one that seems very off to me is a Rikenon 50mm F1.4 lens, which has a yellow cast.
Is it normal for the color rendition to vary a lot between lenses or is there some setting on the NEX-7 that needs to be changed when using a manual lens with an adapter?



Sony 18-55mm kit lens



Rikenon 50mm F1.4



Sigma 30mm F2.8 EX DN

[Arkku]

I'm guessing the Rikenon might be one of the many radioactive fast normal lenses and thus yellowed. Or some lenses just yellow over time even if they are not radioactive. You can de-yellow it by exposing the rear element to strong UV light (e.g., the sun for several days with no other glass like window in between).

Other than that, you can adjust the colours easiest by shooting raw, but custom white balance also helps in camera.

[fermy]

[Arkku]

Disclaimer: I don't have this particular lens so I was only guessing about the radioactivity. However, based on some vague and unreliable internet sources, I've been under the impression that the 50mm f/1.4 Rikenon and Yashinon might be the same lens, and I have the Yashinon 50mm f/1.4, which I have measured to be radioactive.

[fermy]

Yeah, my lens is 55mm f1.4, so a completely different one. It could certainly be that 50mm f1.4 is radioactive.

[Keysersoze27]

Got a Mint Rikenon P 50/1.4 for K mount and I don't see any yellow rendering in my 5DII.
I might even say it has a rendering on the cold side.

[AlexTheCat]

I looked through the lens and it seems to have a slight yellow tint. I guess I'll have to give it sun treatment.

[Lightshow]

I've found the AWB in the NEX-7 to be quirky, it will at times shift the WB around depending in what's in the FOV, even just stopping down has caused a shift, my Canon's never did this, set your shots to the same WB(Daylight) when testing lenses.