George You know you're getting on when the equipment you farmed with is showing up as suburban lawn ornaments.
Home-built Dob 10 F6/Zambuto/Osypowski Platform Starmaster 7 Oak Classic- Zambuto Discmount DM-4 w encoders Stellarvue 80ED Stellarvue 70ED Stellarvue 60 Finder Tasco 50 refractor (1966 birthday gift) Orion 80ST Lunt 60 Double Stack Bogen with Dwarfstar mount AT Voyager mount Celestron SLT mount Astro Physics 15x70 Binos Orion Parallelogram mount
Quote:I'm going to answer your question from another perspective.Glass shatters when it breaks. Oh sure, being next to a Telescope you're likely not going to have to worry about it, but many of us also do woodwork and light drilling, and you're likely to wear your glasses for that as well.Call me OCD when it comes to eye safety. I only have one left.
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html
17.5" Dob "Beta Version"
NP 127 on a CG-5 and CGEM DX
25x100 and assorted other binos
Naglers, Ethos and various others.
Quote: Glass is better optically
Quote:Here's my experience with them, for what its worth. I use the Crizal plastic lenses and I love them. I realize that glass is a better lens material, but I sure don't notice any issues. Stars are pinpoint sharp when I'm wearing them, and I'm not aware of any optical aberrations while wearing them. Plastic lenses are also lighter. My glasses are in wire frames, so they are extremely light and comfortable. As far as being smudge resistant and all, I don't notice any difference between the Crizal lenses and anything else--mine still get smudgy and dirty like any others, so I think there might be a bit of hype in that claim. I'm on my second set, and I'll keep getting them with the Crizal lenses until something better comes along.
Happy owner of--
A Mag 1, 12.5 inch Porta Ball
A Dual Axis Equatorial Platform
A PST Double Stack
Dark Arts Observatory - Brockport, NY - Skyshed POD XL5 with iOptron iEQ45 Mount
Scopes: C8, C5, SV110 ED, EON-72 ED, ST 80, ATRC6, Megrez 90
ATM 13.1" reflector Sky Watcher BK 120 ED Orion 80 ED HEQ5 Pro and EQ6 Pro Modded Rebel XT and T3i unmodded KWIQ Guider http://www.pierresplace.ca
Chris Small telescopes, some medium size, a smattering of eyepieces and filters. The human brain-a 3 pound, 30 watt, self-programming supercomputer that can be mass produced by unskilled labor. Member IDA
Quote:I once tried polycarbonate lenses. I did not like them at all. They had terrible off-axis dispersion. I went back to glass. Chuck
Quote:Quote: Glass is better optically This has not been my experience. I have had several pairs of both and I have had turkeys in both types.Generally, though, my plastic lenses have had superior coatings for anti-reflectivity. I suspect it is simply because of the much higher popularity of AR coatings on plastic lenses.I find it a little amusing that my best glasses have used lenses from Nikon and Zeiss. I guess if you do optics well, you do optics well.
Friends call me Duane. Compustar C14, Leo Henzl's Custom C8, 6" Refractor Adv. GT mount, 6" F5 Omni XLT Newt., LXD-75 F4 Imaging SN8, Meade 8" F6 Newtonian, EX Dynamax DX6, RV-6 ETX-90 Astro, Meade 2045 4" SCT, B&L 4000 Vixen/Celestron 80mm F11 JC Penny 60mm AZ/ALT Refractor Binos 25x100
Quote:I need to wear glasses while observing. Before purchasing my new glasses I researched astronomy friendly lens/coating options. The general consensus I got from the web was that glass lenses were preferred for their higher clarity and Crizal Avance coatings were recommended for their A/R and anti-smudge properties. I have unusually long eyelashes so I was particularly attracted to the anti-smudge factor because my eyelashes frequently deposit oil on the lenses.
When I picked up my new glasses today the optician told me they did not have the Crizal Avance coatings because it cannot be applied to glass lenses. I vented my displeasure and let them know that they should have given me the option before substituting generic coatings on the glass lenses. They agreed to let me try the glasses for 30 days and if I am dissatisfied I can exchange the glass lenses with generic A/R coating for plastic lenses with the Crizal Avance coatings.
Do any of you use the Crizal Avance coatings and if so do they live up to the hype or is it just marketing? If you had to choose between glass lenses and top notch coatings what would your choice be? The extra weight of glass lenses isn't a factor. I've been wearing them for 8 hours without a problem.
Quote: My sharpest pair were High index Glass Progressive Varilux Lenses with AR Coating.
Quote:Are progressives a problem at the ep? Mike
Quote: Yes. I use progressives for my normal glasses, but went with standard bifocals for the astronomy glasses. I used a larger than normal frame and had the closeup section of the bfocals set lower in the frame so that the line would not be in my view at the eyepiece.