Originally posted by DaveInPA Crewl1,
Thanks for taking the time to create and post this! I'm going to check this out this week.
I just got my Fotodiox adapter and I'm anxious to try it on my Sigma 70-200/2.8. I also just ordered a Pentax M-135 off eBay for $40 to play with as well.
Any special advice on using focus-peaking?
I like the Sigma 70-200 2.8 on the Q, I have the HSM II version and I found the best spot for it is #2 on the Fotodiox which gives about a 5.6 F stop.
This lens particularly requires that the Fotodiox be modified to have the internal reflections reduced since it has an element very close to the rear that can catch reflections. I painted the adapter with
flat black spray paint inside, masking off the aperture mechanism. Use a good quality spray paint, not a 99c cheap store brand so it will stick well. Rustoleum or Krylon or something for engine parts from the auto supply store should work.
If you try it without, you will get a kind of smoky hazy look to the pictures in shots with a lot of light.
The first two images in this post shows the IQ before the paint
https://www.pentaxforums.com/forums/pentax-q/173602-reach-q-images-3.html#post2116729
This shows what you can get afterwards
https://www.pentaxforums.com/forums/pentax-q/173602-reach-q-images-5.html#post2120904
As far as focus Peaking, it really depends on the subject and shooting conditions as to when it will be most effective.
When shooting birds outdoors with the longer lenses I usually turn it off because I can get a better focus view with the 4x magnification, and now I am using a lcd loupe which really helps.
In dimmer lighting the peaking helps. Just try it both ways and see which you like better.