Originally posted by cpoteet As a new K-1 user, I have a question about the effect of the Crop function. If I mount a DA* 400mm on the K-1 in Crop mode, will I have an effective 600mm lens?
Thank you.
---------- Post added 11-08-17 at 07:09 AM ----------
Correction: will the DA*300mm give me an effective 450mm lens?
It makes no difference to your images.
Field of view is measured as an angle. On APS-c that would be 5.4º horizontal and 4.6º which would be the equivalent of 450mm is it were a full frame image.
The 300 on full frame will be approximately the equivalent FoV of a 200mm lens on APS-c. The DA* 200 on APS-c is 8.1º and 6.9º. But only the FoV changes. The resolution and image is the same, there is just less of it. So, it's not the same as a 150--450 in full frame mode, because you've cropped so much of the sensor.
SO it's not the same as 450 in full frame mode, you've lost a lot of resolution, but it's a lower res 450 FF image.
So really, unless you have large file issues with your computer, shoot in FF mode and crop to suit.
Last edited by normhead; 11-08-2017 at 07:14 AM.