Quote:
Originally Posted by janoskiss
I have that barlow also, for use at parties, around kids, intoxicated folk etc. It is a good barlow for very little money. Nice FMC optics. Its main shortcoming is the black but shiney lens assembly housing. You get strong glare when a bright object is just outside the FOV, and the contrast in general is not as good as in the Orion Deluxe or Televue barlows. The other minor complaint would be some false colour off axis with wide AFOV EPs (esp when trying to push the power higher using a barrel extension).
One nice thing about the Bintel (ie GSO 1.25" 2x shorty) barlow is that the lens assembly can be unscrewed and screwed directly onto the filter threads on any 1.25" eyepiece to give 1.6-1.8x magnification. Could be a good fairly cheap permanent fixer upper for use with lesser widefield EPs in fast scopes. (some treatment of the shiney metal surface with a matte black coating would be a good idea..)
Barlowing the 6.4mm will yield too much power for that scope IMO.You would not have any problems with focus though.
|
Thanks for the tip about the unscrewing part - will try that out
:-)
I thought the rule of thumb for practical power was 20xper inch of aperature, so for my that should be 200. 500mm focal length with barlow and 6.4mm is only 156X magnification, which should be fine? In my experience it has been.
Cheers,
Steve