Samyang star problem

[NixA]

First, sorry if I am posting this to the wrong place.

So, I got a Samyang 135mm f2 lens last tear and since than I had problems. I use a Canon 1300D baader modified, an astronomik cls filter and an stc duo nb filter. 

For some reason, my R channel is always horribly out of focus while G and B are perfect. This gives me red stars always and even at f8 the problem is here.

Does anyone have any tips or help to fix this?

No, color calibrating does NOT help even a bit. 

[jiberjaber]

Wow such an odd problem that! Have you tried it with a none modified camera to isolate it to lens / camera ?

[NixA]

Just now, jiberjaber said:

Wow such an odd problem that! Have you tried it with a none modified camera to isolate it to lens / camera ?

Hi, well no. And I had thoughts about that too, as I had the same red stars with the 50mm f1.8. 

[jiberjaber]

Sounds like you might need to investigate that first

[NixA]

1 minute ago, jiberjaber said:

Sounds like you might need to investigate that first

I know a few people who got the Baader mod and they dont have that issue. It is really weird haha

[michael8554]

Can you post a jpeg of one of your subs ?

If the 1300D is Baader modified then bloated stars due to Infrared reaching the sensor shouldn't be occurring.

Michael

[NixA]

Hi everyone.

At the end after a year I fixed it. I threw my bahtinov mask out and focused on small stars. No more red stars, no more red out of focus.