Who has Lightroom "lens correction" profiles for Large Format lenses ?

[sinarleica]

HI ,
I 'd like to use the "lens correction" profile option of Lightroom for my LF lenses
SINARON 90 MM F4.5; 65 MM NIKON F4, and others

WHo has these profiles ?


Thanks

[Walter Calahan]

Adobe has a lens profile software program you can download and create your own profiles.

[DJG]

Just wondering, but would this even be possible if you start using things like tilts and swings?

[Kirk Gittings]

As with Tilt shift lenses, this would really complicate the calibration as the lens would need a separate calibration if unshifted vs. shifted up 5cm etc.

[Kirk Gittings]

As with Tilt shift lenses, this would really complicate the calibration as the lens would need a separate calibration if unshifted vs. shifted up 5cm etc.

OP what problems are you trying to correct?

[Ken Lee]

Are those lenses not rectilinear ? Or is the issue merely the distortion and light falloff typical of wide-angle lenses ?

[rdenney]

Ken, it's mostly lateral color. Just last night I spent time correcting, as best I could, the lateral color of a Pentax 67 fisheye. I then just saved the settings as a lens profile. That was using the lens correction filter in Photoshop--I don't know if that feature, with its detailed controls, is available in Lightroom.

With shifts, I expand the canvas so that the optical axis is in the middle of the frame. Then, I can apply corrections for falloff and lateral color, which are both symmetrical about the optical axis. I then crop it back down to the portion of the canvas filled with image. I learned this trick with the first Canon 24mm TSE lens, which suffers from lateral color.

Rick "who will look into the Adobe profile builder" Denney

[Greg Miller]

Lightroom uses ACR (Adobe Camera RAW). ACR has similar corrections and the ability to save custom settings.

[C. D. Keth]

Just wondering, but would this even be possible if you start using things like tilts and swings?

It's possible (I don't know if it's possible in lightroom), we do it for effects work in movies sometimes, but you need first a very detailed profile of the lens' behavior. Then, you need recorded any movements and how much, as precise as possible. I'm satisfied doing it all by eye rather than spending my time recording "film portrait layout, 27mm of rise, 2.6 degrees tilt forward"

[Kirk Gittings]

Are those lenses not rectilinear ? Or is the issue merely the distortion and light falloff typical of wide-angle lenses ?

Once you shift the lens, aberrations like barrel distortion are no longer symmetrical. The more you shift the less symmetrical the aberrations are. With LR4 CA is treated differently so that is no longer an issue with shift lenses. The newest Canon T/S lenses require very little correction however.

Only Capture One V7 software has a lens correction module which allows you to offset the center allowing for better correction of shifted lenses. I have not tried it however.