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Help for a novice please - vignetting (1 Viewer)

kennygee

Well-known member
I am a complete novice and after buying a Nikon digiscope kit (CP4500+Nikon 60mm spotting scope, 20X e/p, adapters etc) I have joined the forum to get tips and hopefully increase my digiscoping enjoyment.

My question is: is it normal to experience vignetting with the above kit? I find I have to zoom in to about 50% on the optical zoom to remove the problem.

Should the rubber eyecup be left on the scope or removed when the kit is assembled? I have left it on (folded back) at present as it may be bad practise in terms of risking scratching the optics. Is this contributing to the vignetting.

I'd like to thank Andy for the thread on camera settings as I was a bit lost before reading it.

This is my first post, I hope its not too basic for you experts.

Cheers

Ken
 
Hi Ken, welcome to birdforum from all the staff here.
The amount of vignetting varies depending upon the scope/eyepiece used and how close you can get your camera lens to the eyepiece. Inevitably there will be vignetting with most birding scopes, with some set-ups it goes quite quickly as you zoom up with the camera.

If the rubber eye-cup is preventing your camera lens from getting as close to the eyepiece glass as possible, then you will have to make the decision on whether it's worth removing the eye-cup completely... if it makes for a substantial improvement in vignetting, then it's probably worth removing.

regards,
Andy
 
Thanks Andy - I'll try it with the cup removed. Hopefully it will improve. If I were more experienced I'd know whether the degree of vignetting is normal. I suspect judging from your reply it probably is.
 
It may be normal for that eyepiece/scope combination, Nikon eyepieces are not known for great eye-relief, which can be a major factor with vignetting. Generally I'd expect vignetting to disappear between a 1/4 and 1/3 of camera zoom range on the more suitable scopes/eyepieces.
cheers,
Andy
 
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