Quote:
Originally Posted by Solanum
Thanks for this, I was actually going to ask about a focal reducer in a new thread, what are the downsides? Presumably there is less back-focus? Does this also affect the eye-relief? Does focussing become more difficult (the travel on the focus knob is a lot less than I am used to, which makes it a bit more fiddly)?
Everard
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I've never had a problem getting any eyepiece to focus with my f/6.3 reducer. That said, I rarely use it.
While it worked fine on open clusters, I always felt that when trying to observe the really faint stuff at a dark sky site, using eyepieces that gave equivalent focal lengths, I could see the really faint galaxies better without it than with an eyepiece and it.
I did think that it would be handy for my more expensive eyepieces to get more use out of them - at the time I had a 14mm ultrawide angle, which acted like 22mm UWA with the focal reducer. Instead I found I just preferred to use my simple 20mm wide angle.
The focal reducer is certainly good for astrophotography.
Regards,
Renato