JAWAID IQBAL ABBASI
Quote:The focuser utilize compression rings. ... But for at least some of those oculars having the so-called 'safety' undercut, they're hell! The spilt ring falls nicely into the 'safety' groove and so in order to be tightened requires turning the upper ring MANY times. And of course, to release the eyepiece the upper ring must be turned as many times in reverse. The somewhat stiff--and FINE--action of rotation doesn't help, either. AArrggh!
Quote:Frankly I blame the eyepiece manufacturers for this. The barrel undercuts are nothing but a headache and I loathe them.
The night sky is the canvas....
My optics are the brush....
The Milky Way is the masterpiece
reductio ad absurdum of epistomology is solipsism....
Binoculars: Miyauchi Saturn III - 33/39/50/71/150x100, WO 22x70ED, Fujinon 16x70 FMT-SX Pentax 10x50 PCF-V, 10x43 DCF-SP, 6.5x21 Papilio
Nikon 10x35 EII, 7x35 E, 8x30 EII, 8x23CF AS Diplomat
B&L 7x26 Custom
Scopes: C9.25, TMB130SS/FT, SV80S-LOMO 80/480
Quote:Glenn, it make me worried that I paid $1200 but they gave me 77mm. If all true then I am really disappointed though, my Orion BT-100 (BT-77 ?) is giving me nice and bright image but I paid for 100mm and ecpect 100mm full aperture.
Quote:I can see (but still wouldn't like) 5% or even 10% less actual effective aperture than claimed but a whopping 22% just goes TOO far.
Quote:You're not going to be happy with the 90s so return them to Orion (they are very good about customer service) and buy a pair of The APM 100 45s which Michael Mc likes a lot or the Oberwerk BT100 45s that I own and highly recommend.
Quote:My official guess would be 88mm effective aperture. It would be suitably ironic, if true.
Jeff Morgan - Wile E. Coyote School of Telescope Making
So this cabbie says: "Know who I had in this cab last week? Bertrand Russell! Wisest man in the Western World. And I says to him 'Bertie, what's it all about?' And do you know, he couldn't tell me..." Kenneth Williams
Quote:I was wondering about the Miyauchi 90° models also. There was a 100mm and a 141mm 90° model that Oberwerk carried a while ago. It would be nice to know what their effective aperture is and if it's close to full, how they did it.Unfortunately if someone on CN has one of these binoculars I'm not aware of it. When I spoke with Kevin awhile ago, he confirmed that someone did buy the 141 90° model he had in '09.