I tried a mirrorless. Have you?

MarBa wrote:

unhappymeal wrote:

Every time I feel nostalgic and want to pick-up a KP or K-1, I have to remind myself how awful calibrating lenses is and how much harder manual focus using the OVF is compared to an EVF.

I hate this too ... But Pentax could improve the process! This could be entirely automatic with little user input. Simply use LV to focus compare this with AF measurement and calculate correction .. they can even take photos and compare sharpness in the center etc ... All this could be automated for calibration of different focal lengths, or AF points.

So .. yeah .. with bit of software development it could be an easy proces .. put camera on a tripod and press a button!

I am a programmer, and I have been thinking about this one. If I can write such a program.

There are some problems.

1. The communication protocol is too simple. It do not support what you want/need.
   You cannot do micro movements.
   You do not really know where you have focused.
   You cannot set the adjustments.
2. There is really no way to calibrate zooms over the entire interval.
3. Focusing is not accurate. It varies from try to try.
4. Evaluating if you are in focus is not easy.
5. Focus shift makes it sometimes nearly useless to calibrate for full opening and then use F5.6. They need separate calibration.
6. How about calibration not only center spot?

Number 1 is a blocker for totally automatic calibration I would say. But you could do it by manually set the different calibration steps, and for every step automatically take a number of pictures and analyze the result into a number. Calibration with highest sharpness wins.

Number 2 is a blocker for zooms really.

Number 3 and 4 makes it difficult.

Number 5 makes calibration of some fast lenses almost impossible. Actually even AF.

Number 6 I think is something that those that calibrate chose to ignore.