Hi there, I have a bit of a noob question I need an answer for here. If Im viewing an object through the eyepiece and have what appears to ME to be the prime focus for this object, assuming that everyones eyes are different, does the next person to look at this object need to re-focus the telescope to suit their own eyes?
Hi Peter, It doesn't matter whether you are using an eyepiece or prime
focus, everyone's eyes are different, so some will need to refocus and some won't.
raymo
As Raymo said some won't need to, some will need to refocus.
There is another factor too - age. Youngsters should be able to focus over a wide range, but adults ability to focus will be quite limited. In your 40's your eyes pretty much lose their ability to focus and you may need laser surgery, contact lenses or specs to correct short/long sightedness.
If I'm on my own I'll take my specs off to observe (I'm quite long-sighted) but if there are others around I'll keep them on and focus the scope accordingly, which gets it pretty close for most.
