[mikeSF]

I think you are probably correct on this assesment. ,,,
More soon.

Good stuff. thanks!

[clickclick]

Finally had a chance to dig back through old test shots and get something together. As I did this, I came away wanting to do a whole new series. The shots I've picked were all from groups starting wide open and stopped down by 1/3 steps, 3 second delay remote release on a tripod, SR off, contrast detect AF - probably would do it manual next time. I picked the sharpest/most detailed one from each set for these comparisons. To my surprise, a few of these were stopped down pretty far e.g. enough so I'd have thought defraction would have started - part of why I want to do more tests. I decided to just take the jpegs out of the camera. I did shoot RAW+, and considered evening out the exposure on a couple of them, but decided this was good enough as a starting point. Most of these were taken with my K-3 II, but the last series across the river were with my K-1. My DA* 60-250 doesn't have the baffle modification. Need to find someone with a 3D printer. Each set consists of the original OOC without the adapter, that same file resampled to 170% using laczose2 to simulate the magnification of the 1.7x multiplication done by the adapter, and then a shot with the Pentax 1.7x AF/TC, so four photos for each set. They are all here: https://www.flickr.com/gp/148580750@N05/1i61b3

For immediate viewing on this page, I've linked versions of the crop from the 170% resamples and then the version with the TC. And again, for those who want to pixel peep: https://www.flickr.com/gp/148580750@N05/1i61b3 Let me know if there are problems viewing.

I'm totally open to any constructive input on getting more out of my TC. I am fully aware that primes do better than zooms, and I'd be very interested in trying out a DA*300. Perhaps a future subject of LBA. I also realize that some knowledgeable work in post can make a big difference in final results, and I was lazy here by just using the OOC jpegs. I think the adapter works best on the K-1. I believe it's because the higher pixel density of the K3 II can grab more to start with and is resolving more. Figuring out how to get the most out of these is all the more reason to go take more photographs.






DFA 150-450 crop from 170%




DFA 150-450 with 1.7x AF/TC





DA* 60-250 crop from 170%




DA* 60-250 with 1.7x AF/TC




DFA 150-450 crop from 170%




DFA 150-450 with 1.7x AF/TC




K-1 DA* 60-250 crop from 170%




K-1 DA* 60-250 with 1.7x AF/TC

[clickclick]

Good stuff. thanks!

Finally got some things together this past weekend. Wondering how it compares to your experiences?

[mikeSF]

Finally got some things together this past weekend. Wondering how it compares to your experiences?

if you are applying an algorithm to one set and not the other, you have introduced a new variable and are no longer comparing optics.