Hallo to you,
Can you let me know,
1. Does this Zhumell spotting scope with an angled eyepiece, or any similar other model, have ED aperture lens.
2. is there any significant chromatic aberation with this model
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This is a spotting scope, mostly used in conjunction with firearms on the firing range or maybe hunting. It is a terrestrial refractor scope and shows erect images (the right way up). It isn't really ideal for astronomy.
One would generally want a larger diameter objective and a simpler eyepiece system (not a zoom) for stargazing. Some people start astronomy with a pair of binoculars (7x50), which would be as good or better than this for the purpose. Eventually you will want to see faint objects which requires a larger objective (main lens or mirror) to gather enough light and give good resolution. The upside down thing doesn't matter when looking at stars.
But when you're talking about rifle scopes, here's what you need to know:
Adjusting the angle of your scope by 1 MOA will change the point of impact by about 1 inch at a distance of 100 yards. So 4 MOA is roughly 4 inches over on an object viewed at 100 yards.
Usually, the windage and elevation adjustments on a scope will be about 1/4 MOA, or about a 0.25 inch change over 100 yards.
sounds like it was designed to use only the eyepiece that came with it. here is an idea...mount the scope on a tripod with no eyepiece in it...now take an 1 1/4" eyepice and place against the scope where you would put the eyepiece ..try to focus..if you cant, then slowly bring the eyepiece away from the scope till you see a sharp image..im sure a machine shop can make a sleeve to screw into your scope and hold 1 1/4" at that point.any questions i can answer call me firstname.lastname@example.org 5088331232