Help needed - from those who have done it

[Paradigm_sg]

I am using a EOS300D camera and C5 telescope. Was trying to take a picture of the moon last night using a deluxe tele-extender. When I am using a 30mm lens, I could see the image thru the viewfinder of my camera but when I switch to a 9 mm, I can only see a multicoloured-pixelled light source. No matter how much I try to focus, it just would not focus to an image ... Not the first time already. Previously, I was using a C8 with another lens also same problem.

was it due to the exit pupil of my lens being too small?

Thanks in advance

[weixing]

Hi,

I am using a EOS300D camera and C5 telescope. Was trying to take a picture of the moon last night using a deluxe tele-extender. When I am using a 30mm lens, I could see the image thru the viewfinder of my camera but when I switch to a 9 mm, I can only see a multicoloured-pixelled light source. No matter how much I try to focus, it just would not focus to an image ... Not the first time already. Previously, I was using a C8 with another lens also same problem.

was it due to the exit pupil of my lens being too small?

Thanks in advance

Your 9mm eyepiece eye relief may be too short. For eyepiece projection to work correctly, you need a relatively long eye relief eyepiece. Generally speaking, the shorter the eyepiece focal length, the shorter the eye relief, unless you get those long eye relief eyepiece. Try using a barlow instead of a shorter focal length eyepiece if you don't have a long eye relief eyepiece.

Have a nice day.

[Paradigm_sg]

Hi Wei Xing, Thanks for the info ... Hmmm, OK, I will try out using my barlow lens tonight