TMB Planetary II
Posted 08 May 2013 - 10:12 PM
Posted 08 May 2013 - 10:39 PM
Gregory93, I tried the TMB II 9mm in my TV NP127 which is f/5.2. There was very significant field curvature so it was no good in my scope. Keep in mind though, the TV scopes are very demanding on eyepiece design and quality, and I only have my own eyes to go by... Cheers, Fox
I have a set of TMB Planetary eyepieces and I frequently use the 9mm, the 6mm and the 4mm in my NP-101. They all exhibit what appears to me to be off-axis astigmatism. If my memory is correct, I cannot get them to focus at the edge of the field. Using them with the front section of a 1.25 inch GSO Barlow which provides about 1.5x magnification and a shift in the effective focal ratio from F/5.4 to about F/8.1 really cleans up the astigmatism, a tight double can drift past the field stop still nicely resolved.
For the money, they are quite good eyepieces... Last night I was using the 9mm in my NP-101 from my light polluted backyard to view M65 and M66. I could see both galaxies but they were not easily seen. I switched to the 9mm Nagler, both were slightly easier to see.
Posted 09 May 2013 - 11:46 AM