IRUV Filters and Coding

[wilfredo]

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Perhaps someone can clarify? Will lens coding still be needed to correct the Magenta problem even after shooting with the IRUV 486 filters on the lens? I only shoot RAW my understanding is that coding is only an issue when shooting JPEGS.

 

Thanks,

Wilfredo+

Benitez-Rivera Photography

[Shootist]

To my knowledge the coding has nothing to do with the magenta problem caused by NO IR filter on the sensor. The coding is to help on wide angle lenses for vignetting and cyan corners and to place the lens MM in the file info.

[dhoelscher]

Wilfredo,

 

I'm not an expert, but my understanding is that:

 

1) (for the most part) Using a 486 filter on the lens tackles the IR Magenta Madness problem by itself

2) for lenses with focal lengths of 35mm and shorter, there will be some Sean Reid Cyan Drift manifesting as progressively more cyan-ness heading into the corners.

3) Coding will allow firmware 1.10 to identify and destroy #2 as well as lens-dependent luminance vignetting (darkening in the corners) in both DNGs and JPEGs; presumably also will trigger a 486-appropriate color profile as well.

 

For lenses you can't or don't won't to code - (mostly) No issues in black and white photography with the 486 filters; and for color photography with lenses 35mm and wider you can use third party software like Panotools to take care of the cyan vignetting.

 

DH

[wilfredo]

I mostly shoot with the 35mm Lens so I guess I'll have to get it coded eventually for those times when I will want a color shot.

 

Thanks,

Wilfredo+

Benitez-Rivera Photography

[Guest guy_mancuso]

Wilfredo,

 

I'm not an expert, but my understanding is that:

 

1) (for the most part) Using a 486 filter on the lens tackles the IR Magenta Madness problem by itself

2) for lenses with focal lengths of 35mm and shorter, there will be some Sean Reid Cyan Drift manifesting as progressively more cyan-ness heading into the corners.

3) Coding will allow firmware 1.10 to identify and destroy #2 as well as lens-dependent luminance vignetting (darkening in the corners) in both DNGs and JPEGs; presumably also will trigger a 486-appropriate color profile as well.

 

For lenses you can't or don't won't to code - (mostly) No issues in black and white photography with the 486 filters; and for color photography with lenses 35mm and wider you can use third party software like Panotools to take care of the cyan vignetting.

 

DH

 

Well said David except for the profile if that is what you meant. That will be in your Raw processing software

[chetccox]

I don't know which 35mm lens you have, but they are all easy to self-code. The 35/2.0 is the easiest - just one mark. All 4 marks are together, so you just need one mark that covers the 4 sensors and does not extend to the sensors on each end. It takes me one minute or less to code a lens, and it works. Even if you change lenses all the time the marks wear very well and are very easily renewed with the sharpie. The other advantage is you can't screw it up! If you do, it is easy to erase the sharpie marks and start over. Try it, you'll like it!

[dhoelscher]

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Well said David except for the profile if that is what you meant. That will be in your Raw processing software

 

 

So true, Guy .... but I was referring to the JPEG ...

 

DH