Since I got my Conquest HD 8x42 I have experienced that I now and then have the feeling of not getting the image in focus instantly, and need to refocus. Recently I noticed that it's a play in the focusing wheel.
The reason I didn't realise the reason at once is the low resistance and smooth traction of the focusing wheel. If it had been stiffer I had noticed it instantly.
Then I spoke to a dealer about it and he told that this is common with the Conquest HD series, and not a fault, but it's just how the focusing wheel works.
While I don't like this issue, I don't consider it as a serious problem. I find it a problem usually at short distance, when the need of changing focus is more frequent.
After reading your post, I think that the salesman was full of horse malarchy to say that play in a focuser wheel is "not a fault." Focusers should focus smoothly and evenly w/out backlash or "play," particularly at this price point. If "play" is common in the Conquest HD series, it's a flaw in the design.
I have the same "feeling of not getting the image in focus instantly, and need to refocus" with the Terra ED, but there's no play in the focuser wheel. It's due to the very fast focuser, which by my measurement turns less than 1/2 turn from cf to infinity. Others have measured it at 3/4 of a turn for their eyes/sample.
Particularly when light levels drop and my acuity goes down, I'm "hunting" for the fine focus. I otherwise like the Terra, but the fast focuser is not for me. I don't think I could deal with a "playful" Conquest HD focuser either, which is a shame, because I had high hopes (high apple pie in the sky-ah-eye hopes) for the Conquest HD in that it would be an affordable near alpha quality roof.
I also don't like your description of the focuser as "low resistance and smooth traction of the focusing wheel." Smooth yes, low resistance, no. I want some stickion not a loosey goosey focuser wheel. Been there, done that, won't do that again.
For close-in birding, the focuser wheel has to be very good. If not, you're fiddling with it trying to get the birds in focus or your fingers hurt from turning a stiff focus wheel all day. .
I'm willing to compromise on other aspects of binoculars, but the focuser
must work well if they ever want to get money out of my wallet (and the moths that accompany it
).
Brock