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Author Topic: Lens profiles  (Read 683 times)

tonyespofoito

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Lens profiles
« on: December 02, 2022, 08:27:25 pm »

Regarding lens profiles for unlisted lenses: If using a T/S lens, there is no profile available. What is the best practice? I've been checking 'remove chromatic aberation' and leaving it at that. It's just a guess on my part if that is the best choice. Canon does not have another 45mm or 90mm lens so picking something similar is not possible. I'm hoping that one of you with more experience than me might have a better answer. I use ACR but this question would apply equally to Lightroom. Thanks in advance to any of you who reply.
 
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digitaldog

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Re: Lens profiles
« Reply #1 on: December 02, 2022, 09:11:55 pm »

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mcbroomf

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Re: Lens profiles
« Reply #2 on: December 03, 2022, 04:00:33 am »

You can't profile a T/S lens due to the movements (the lens cannot send the tilt/PC movements).  I guess you could do one with no movement but Canon/Adobe have never done that with any of their T/S lenses.  I always check remove CA and don't worry about distortion or vignetting (or make manual changes).
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Rhossydd

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Re: Lens profiles
« Reply #3 on: December 03, 2022, 04:03:54 am »

Adobe won't deliver any sort of lens profile for T/S lenses. Any distortion from the lens will vary with shift and tilt, so any correction would have to know how much a lens has moved. As these lenses don't record on EXIF how much T&S has been applied, a profile would be useless.

However these lenses do have excellent base characteristics, especially when used with small amounts of movement. So there's little to correct, especially so with the 45mm & 90mm.
Bottom line; Don't worry about it.
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kers

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Re: Lens profiles
« Reply #4 on: December 03, 2022, 06:09:44 am »

The only way tot correct a TS lens is to know the movement of the particular image and project the (moved) image in the complete lens circle and apply the lens distortion there.

I have done that in the past, but it is cumbersome and you have to know ( calculate) the distortion. There was a plug in, but i don't think it still exists.

https://www.epaperpress.com/     plugin was called : pt lens   by Tom Niemann
« Last Edit: December 03, 2022, 06:30:32 am by kers »
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tonyespofoito

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Re: Lens profiles
« Reply #5 on: December 03, 2022, 06:58:13 pm »

Thank you all for your replies. Short of creating a set of lens profiles including various combinations of tilt and shift, the only solution is to correct only for CA, which is what I will continue doing. I greatly appreciate all who took the time to reply. It is gratifying to be able to call upon others whose knowledge and experience is greater than my own. Thank you very much.
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