Did a couple of tests in the field with the Sigma, I was not impressed with the results.
Really it appears that if you want to use the Q as a 5.5x adapter you need a prime with superb IQ on its own.
Here is a shot of Legg Lake in Rosemead, CA taken with the Prime 01, it gets some decent waterfowl visitors during the week when human visitors are scarce.
There is a Snowy Egret in the reeds across from the bank.
Best I could do with the Sigma was this shot, the zoom is backed off below 200 as at 200 it would get smoky. This one won't be used with the Q.
I'm thinking maybe a better 70-200 like the Tammy or the Pentax 60-250 might improve things.
The real joy today came from the DA*300, which should come as no surprise, but really what this thing can pull off is truly amazing.
Here is a Great Blue Heron, which typically is very skittish so I initially kept my distance.
The setup taken with my iPhone. Q+DA*300
I can't believe how good these shots came out
Yes this is a DA*300 +Q, no cropping, minor clarity and sharpen that I do on any shot.
So then I take the DA*300 and put it on my K-5, figure I will get some BIF shots as soon as it sees me.
Turns out this guy was on his meds today and let me get super close before he flapped.
Comparing the close shots with the K-5/DA*300 I don't really see a diff, perhaps just the bokeh is a little nervous from the Q setup.
I am truly amazed
Oh he did eventually get annoyed