Quote:
Originally Posted by grimsay
Music to my ears Alexander... exactly what I'm looking for (5-7mm), more mag for my 8" f/6 dob... any chance you could make some recommendations - in the not so big bucks region? I'm keeping my eye on the classifieds but it's hard to know what's good value for money.
Cheers, Iain
|
Hi Iain and others.
If you want a budget 6mm eyepiece you can't go too far wrong with the Long Perng LER series. I have tried the 3mm, 5mm and 9mm in my f5 dob, f8 refractor and CPC 800 (f10) and they are sharp with great eye relief (20mm), well color-corrected and with very little edge distortion. Andrews sell them for around $79. They have a 55 degree AFOV, which is better than a plossl, and while this is not as good as some of the other cheaper "wide-field" eyepieces out there, it is a field that is sharp almost right to the edge, compared to only about 60% of the way for a lot of the others- so the sharp,
usable FOV is actually pretty good.
The Williams "Super Planetary" series and Orion "Edge On" are pretty much identical, but twice the price...
I have tried the 3mm and 5mm against a barlowed Nagler 13mm T6, and the Nagler 3-6mm zoom, and they stand up pretty well.
Compared to the Naglers, a bit of reflected light is visible if there is a really bright object (like the moon) just out of the FOV, and the image isn't quite as bright (the Nagler coatings allow more light through-put), but you are hard pressed to see much difference in the sharpness of the image.
Well worth a look: and you could get a 4-eyepiece set for around $300...
- Dean