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I am having a difficult time merging the two views into one image. I get two overlapping circular fields but not a double image. Not comfortable. I suspect this has more to do with the very small exit pupil than collimation

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This has more to do with close focus than anything else and really has nothing to do with small exit pupil or collimation. Typical 20x binoculars, regardless of what is posted as close focus, have a real closest usable focus of about 75 ft. (20m). They will show the field circles of the barrels will not completely overlap at least out to 200 feet (60m). This is common to most binoculars, and especially prominent in higher powerd binocs. Typical low powered binoculars that have a close focus of 15-20 feet will show generally only 75% to 85% of the barrel views is overlapped at 20 feet. Roofs do much better than porros in this respect, with roofs generally showing 85% to 90% of the barrel views overlapped at 20 feet.

FWIW, I checked the edge of field in the barrels of this 20x60 and it matches perfectly when used on night sky at infinity.

Early evening, I spent most of my time viewing the moon. There was always some false color. depending on eye placement and even a slight change in angle of view, the color border on the bright edge of the moon could be made to change from yellow to green to blue. It was narrower than some of the most prominent false color models I've seen. It wasn't really distracting so much that it bothered me.


I noticed this Pentax 20x60 is very sensitive to having IPD set correctly. It is easy to see blackout in the eyepieces when this binocular is not adjusted to your IPD and ER. When I used this with the eyeguards in all the way, I could easily move side to side slightly and experience blackout. If I did not take care to set IPD, I could experience blackout easily.

With my eyeglasses (I typically find best eye relief between 12-15mm), I needed to have the eyeguard turned out one click for proper eye relief. Once I got the IPD and ER set properly, I spent the remainder of a 3 hour evening without experiencing any blackouts at all.

edz

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