IR filter on a lens without a code

[jamriman]

Just wondering if I should buy a IR filter for my 40 rokker, which can't be coded. Any experience? Thanks

 

[Cindy Flood]

You will correct the magenta, but will probably have some problems with cyan in the corners. This can be corrected in post. The lens correction codes for self-coding (depending on your mount, ymmv) are here http://www.digital-leica.com/lens_codes/index.html, but there is no 40mm code. You might play around with a 35 code and see where that gets you. It is definitely worth it to correct the magenta most of the time. It even affects greens in landscape.

 

[furcafe]

FWIW, I haven't noticed any cyan fringing w/a B+W 486 mounted on the 40/2 Rokkor, nor w/any of my Leica 35mm lenses (Summilux & Summicron ASPH). None of my lenses are coded. Per Cindy's post, the filter makes a big difference, especially if you shoot in IR-heavy environments (e.g., in my case, stages & night clubs).

Just wondering if I should buy a IR filter for my 40 rokker, which can't be coded. Any experience? Thanks

 

[Cindy Flood]

I'm only coding lenses that have the cyan vignette. You can check for the vignette by shooting a white background. You won't miss that cyan if it is there. I coded my 15 Heliar and 28 Cron. I had a cyan problem with my 21 pre-ASPH Elmarit with the filter, but I sold it.
BTW, the cyan is so noticable with the 15mm Heliar that you can see it on the screen for a few seconds before the M8 makes the in-camera correction.

 

[grduprey]

I'm using the Leica UV/IR filter on my pre-asph 35 Sumilux, which cannotbe coded, and no cyan shift at all. I think the cyan shift is only there for wider lenses than 35mm. Don't see it at all on longer lenses.