henry link
Well-known member
Kimmo,
I added the following addendum to my review. Its a shame the hybrid idea is mechanically unworkable. I could see that the optics of a 9.5x32 are very nice. I imagine a certain WJC could enlighten us all about the differences in internal construction between the EII and the SE. Bill, where are you when we need you?
(Addendum: I played around with the hybrid idea today and found that it isn't workable. The EII eyepiece will drop into the SE focusing tube, but the cylinder that contains the eyepiece optics is actually about 1mm smaller in diameter than the SE cylinder so the fit is not tight enough for stable collimation. The larger SE eyepiece cylinder will not drop into the EII focusing tube. I also noticed that there is a significant difference in the the workings of the eyepiece focusing tubes inside. The SE eyepiece cylinder fits snugly within its tube so that the cylinder and the tube slide against each other with a large area of contact. The EII eyepiece cylinder is smaller than its tube. At the end of the tube there is a thin ring inside which matches the diameter of the eyepiece cylinder and that is the only point of contact. I suppose a thin ring is perfectly OK just for keeping the eyepiece optics centered, but I would have to guess that the SE construction is more expensive. I should have looked at all this more closely when I wrote the original review.)
I added the following addendum to my review. Its a shame the hybrid idea is mechanically unworkable. I could see that the optics of a 9.5x32 are very nice. I imagine a certain WJC could enlighten us all about the differences in internal construction between the EII and the SE. Bill, where are you when we need you?
(Addendum: I played around with the hybrid idea today and found that it isn't workable. The EII eyepiece will drop into the SE focusing tube, but the cylinder that contains the eyepiece optics is actually about 1mm smaller in diameter than the SE cylinder so the fit is not tight enough for stable collimation. The larger SE eyepiece cylinder will not drop into the EII focusing tube. I also noticed that there is a significant difference in the the workings of the eyepiece focusing tubes inside. The SE eyepiece cylinder fits snugly within its tube so that the cylinder and the tube slide against each other with a large area of contact. The EII eyepiece cylinder is smaller than its tube. At the end of the tube there is a thin ring inside which matches the diameter of the eyepiece cylinder and that is the only point of contact. I suppose a thin ring is perfectly OK just for keeping the eyepiece optics centered, but I would have to guess that the SE construction is more expensive. I should have looked at all this more closely when I wrote the original review.)
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