![]() A Newtonian has two mirrors so there's no mirror reversal - as long as you turn the map the right way you'll get a view that matches what you see on the map. That depends on how many mirrors there are in the optical train - if it's an odd number then what you see through the eyepiece is the mirror image of what's on the map. This is assuming that your scope inverts the image but doesn't mirror-reverse it. You also need to have some sense of how large the FOV is in relation to the map - either measure and make a wire hoop, circle on transparency etc - or just get the feel of it from experience (which is what I do). You turn the map so that West matches the direction in which stars are leaving the field of view (or just turn it mentally in your head if physically turning the map is inconvenient). the horizontal ones - called Declination) and if North is at the top then West is on the right (not left). On a sky map this is the equivalent of the "latitude" lines (i.e. Watch how stars move across the FOV at high power - that line is the celestial East-West line. ![]() ![]() This is one aspect of a PC atlas that is very powerful since you can make it match the "scope view" (I have been told). upside down/left to right with the view of the stars in the atlas? I have not got my head around this at all yet - it is highly confusing. Very basic question guys? When you are at this level of detail how do you match the "scope view" i.e. ![]()
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