Possible to create Lens Profile for telescopes and/or astronomy CCD cameras?

  • 1
  • Question
  • Updated 5 years ago
Is it possible to use the Lens Profile Creator using a telescope as the lens? I sometimes use my Canon DLSR (T3i) on it.

Sometimes I use an astronomy CCD camera - so can Lens Profile Creator handle that as well?

I'm reading about the procedure and it seems possible, however, I'm puzzled if the EXIF data is critical in all of this. My telescopes and CCD cameras do not "report" EXIF data.

This could be very useful in the astronomy community. Before I go and print calibration charts and whatnot I would like to verify creating profiles for my telescopes and cameras is even possible.
Photo of Alex Dzierba

Alex Dzierba

  • 1 Post
  • 0 Reply Likes

Posted 5 years ago

  • 1
Photo of Steve Sprengel

Steve Sprengel, Champion

  • 2668 Posts
  • 343 Reply Likes
Print a chart and try it.

The EXIF parameters that affect lens profiles are: aperture, focal-length and subject distance, all of which would be empty or zeros for a DSLR body without a lens attached, and who knows what for a CCD image, and if you're doing some eye-piece projection that also involves a camera lens that could have a profile, the lens parameters that the lens-correction would be able to see wouldn't be correct since you have extra optics in front.

One question is whether the LPC will accept image files without these three parameters having meaningful values.

If so then the other question would be whether the profiles would be correct for images that aren't focused at infinity, like stars would be. Placing the chart as far from the telescope as possible would be the best approximation to infinity.

Obviously without meaningful EXIF you'd be selecting the lens-profiles by hand.

If it turns out the LPC needs some sort of EXIF, then you could trick it by using some sort of EXIF changing program to inject some normal-looking values into the photos.

You'd need to create one profile for each optical configuration, so one for the camera at prime focus, and another if you're using a focal-reducer/field-flattener, one for the CCD imager, and others if you add barlows or eyepieces, sometimes.