Converging verticals.

Some interesting stuff on the PTLens site. In the profiles it says that Panasonic digital cameras do not need any correcting for distortion because its done in camera. No doubt all cameras will one day have this K50D perhaps? The Panasonics looks good here's a site with some samples Also see the links from PTLens to reviews.... better than DxO or PS at lens corrections.

The only Pentax lens listed as not requiring corrections is the 77mm Limited.

shim

It's (comparatively) easy to correct for distortions in-camera when the lens is fixed - ie. a known quantity. I think you'd have a lot harder time adapting the same technology to a DSLR as you'd have to include seperate corrections for any/all lenses that could possibly be mounted - on Pentax cameras that's a *lot* of potential lenses!

It wouldn't be impossible but I'm not sure how cost effective developing such technology would be tbh.

Silkypix also has digital shift and distorton correction functions.

The shifting does crop the image, though, of course, so allow for this when possible when taking the shot in the first place.

There is information on the PTLens site about having lenses calibrated. link

Click on the calibration tag on the Contents menu, where there is info on how to get a lens profiled by Tom Niemann (author of PTLens).

At the moment the following Pentax lenses are profiled:

Pentax 12-24mm f/4.0 P-DA ED/AL
Pentax 16-45mm f/4.0 P-DA J ED/AL
Pentax 16-50mm f/2.8 ED/AL (IF) DA*
Pentax 18-55mm f/3.5-5.6
Pentax 18-250mm f/3.5-6.3 P-DA ED AL IF
Pentax 28-70mm f/4 FA
Pentax 50-135mm f/2.8 DA IF SDM
Pentax 50-200mm f/4-5.6 P-DA ED
Pentax 55-300mm f/4-5.8 P-DA ED
Pentax 14mm f/2.8 P-DA ED IF
Pentax 20mm f/2.8 P-FA
Pentax 21mm f/3.2 P-DA AL Limited
Pentax 24mm f/2.8 SMC-A
Pentax 28mm f/2 SMC-A
Pentax 28mm f/2.8 SMC-A
Pentax 31mm f/1.8 P-FA Limited
Pentax 35mm f/2 SMC-A
Pentax 35mm f/2.0 P-FA AL
Pentax 40mm f/2.8 P-DA Limited
Pentax 50mm f/1.2 SMC-A
Pentax 50mm f/1.4 SMC-FA
Pentax 70mm f/2.4 P-DA Limited
Pentax 77mm f/1.8 P-FA Limited (no distortion)
Pentax 135mm f/2.8 SMC-A
Pentax 300mm f/4 SMC-A

There are also a host of third party lenses that are profiled. For a complete listing click on the Profiles tab on the Contents menu in the link above.

Cheers

It could be done by the firmware if it contained a database of lens info. The camera can automatically identify the more modern lenses; older lenses could be selected manually from a list.

It's not technologically difficult and could be done in a couple of weeks by a team of programmers. It's just a question of whether Pentax users would want such a feature. There are side effects to any corrections, for a start.