Posted 31 January 2013 - 03:35 PM
Posted 31 January 2013 - 04:26 PM
I bought a 24 Brandon in Dec. and it's one of my favorites. Used it last night last night barlowed back with my 10 XW and 12 Delos with very good seeing on Jupiter, Saturn and the Moon. The Brandon's every bit their equal but with a special quality to the image that's all it's own. I got to use it and the 10XW barlowed at 550X on the Moon in my C-9.25 with excellent seeing a few weeks ago. One of my all time favorite lunar sessions. As for DSOs while image seems darker than the widefields I can see as many stars and or as much nebula detail. Once again that special quality comes through. David
The 24 has become my favorite too. It has sharpness, contrast, and great eye relief. The best view I have ever had of the M11 region (including large Dob views) was through an 8" refractor with the 24 Brandon. The rifts of dark nebula, range of grayscale, and the tiny diamond stars were incredible.
While I love my Delos eyepieces last year I put a barlowed 24 Brandon against my new 10 Delos, and on the narrow field targets it was the clear winner, as I wrote in post 5179553.
Posted 31 January 2013 - 04:53 PM
As for DSOs while image seems darker than the widefields I can see as many stars and or as much nebula detail.
IMO, the darker "look" to the background is a consequence of the reduced transmission of single coated optics and the hypothesized better polish could be a factor as well. FWIW, in many tests I have done over the years with Brandon's vs other multicoated eyepieces, was easy to detect greater extent to nebula and more faint or adverted vision stars with the multicoated optics. Most recently I pitted the 8mm Brandon against the 8mm AP-SPL and it was *no contest* on which pulled in more stars and nebula (the AP)...similarly with the 24mm Brandon vs the 25mm Sterling. On Moon and Planets though, the Brandon definitely outclasses most normal eyepieces showing more or better details.
Posted 31 January 2013 - 05:24 PM
Posted 31 January 2013 - 05:30 PM
Really was one of the very simplest eyepieces to take apart I have done. No little retaining rings to futz with or anything like that. And very easy to "properly" reassemble. [/quote]
No, you're out of luck. You released the magical stardust that Don includes between the lens groups. Your Brandon will never be the same again.
Posted 31 January 2013 - 10:01 PM
Glade you took the time to show the lens elements of the Brandon . I may have known about the lens configuration and let it slip my mind , but it come as a suprise that it looks this way .
I had it in my mind that the Brandon had one lens group with a smaller diameter than the other like what may be called a true Plossl.
Thanks for showing .
PS - Sorry about steering the topic away from thread , I feel remorse over the fact , enough said .
Posted 31 January 2013 - 10:20 PM
Posted 01 February 2013 - 10:27 AM
try rubber O-rings they work great!
Hey! Gonna blacken the edges with a sharpie before you put them back in? Are these easy to take apart and put back together? (I want to blacken mine...) I ordered mine with no fieldstops because I'm alt/az at F20. I'm gonna try cutting my own fieldstops out of a soft black plastic waste-basket. Getting the holes perfectly centre for merging with binos will be the tricky part.