I could use some other opinions here regarding the Q and telephoto lens use. After a severely disappointing outing with the FA* 300 and Vivitar 1.4x shooting the migrating Tundra Swans on Easter Sunday, I gave it a go yesterday without the TC.
It was tripod mounted, though the ballhead was loose allowing for free movement. I tried SR on and off, and the pictures were clearly better with it enabled. While composing, the images looked amazing on the screen...hit the shutter...instant softness, low contrast, almost out of focus. The inside of the Fotodiox adapter is not yet painted--it's such crap anyway, it's not worth the effort.
These are the only two even worth showing...
Mallard at 1/200s ISO 125 (he wasn't moving, and let's ignore the exposure error for now). Bokeh is weird due to a hill 20 feet behind him. Cropped to vertical, some processing. Adapter wide open.
Woodpecker at 1/400 ISO 400, cropped maybe 30%, minimal processing. Adapter closed "one click," effectively f/6.3-7.1 from visual comparison of using the aperture ring on the lens.
They're just...not as sharp as I expect. Any motion in the subject, even with 1/400 shutter speed, means a blurry photo. How much, if anything, would the real Pentax adapter help? I would almost rather skip the adapter and keep saving for the K mount TC Pentax may or may not ever release. Or are my expectations too high?
This was the best I could muster with the Q and 1.4x. Naturally, the closer the subject, the better...they didn't allow me to get within 70 feet.