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
"The heavens declare the glory of God"...
Scopes: EON 120, ST80, ST120, AT80ED, Edmund Astroscan Binoculars: Oberwerk 10x42 Sport RP, Bausch & Lomb 10x50, GO SS 10x50, 15x70, 22x85, GO GBT100 Mounts: Vixen Porta Mount, GO series 5000, Orion Paragon, GO Series 1000 monopod, EQ1 EPs: Orion Expanse, Ultrascopics and Plossls, AT Paradigm, Agena SWA, Baader Hyperion/Zoom, Edmund RKE, Meade Zoom
binoculars 21-150mm scopes 90-368mm AL MasterObserverC #24
Quote:"...unofficial law of diminishing returns..." Unofficial indeed, for it does not apply. If a gigantor of a binocular is not relevant, nor is any size bino. Whether big or small, one is using two eyes and hence enjoying the same gain in signal to noise. The improvement realized when going from, say, a 2" to a 4" bino is the same gain found when transitioning from a 6" to a 12" bino. It's all about ratios. And for given exit pupil diameter, the true bino always offers an image twice as bright as that of the BV-equipped mono job. The humongous bino is quite as relevant as any other size.
17.5" f4.1 Manual Discovery Split Tube Dobsonian (Love 100 AFOV and wide TFOVs).
Denk II Dual Power Switch 3x3=9 powers x3 OCS = 27 power options per eyepiece pair.
2.3x40 to 25x100 Binos (and many in between).
Quote:I can understand going up to 150mm (I have one),but have never understood the logic, reason, usefulnessof the larger BT due to the cost, duplication of opticsWhy not just get a larger scope with binoviewer?Other than uniqueness,doing it because you have the money and can,what is the advantage of this binocular over a telescope?edj
Quote:Ah, but I'm not referring to the precisions of optical law; I'm referring to the fact that, say, a 100mm binocular telescope (like my BT) simply cannot manage the magnification of a good quality 100mm refractor, and is hugely sensitive to the slightest collimation offsets in a way that the telescope isn't.I expect that this custom 12 inch binocular will be built with the intention of being so mechanically and optically perfect that it can perform equally with respect to a mid-sized telescope (I count 12" as mid-sized), but I wouldn't be surprised if the final result was not able to achieve such a level of perfection.Some evidence for my expectations lies in the reviews I've seen of the giant reflector binoculars made by JMI. They are definitely not high magnification instruments, though their aperture is capable of very high magnification in a telescope.
Quote:Quote:http://www.astromart.com/classifieds/details.asp?classified_id=808439 WOW, It really is for sale. I thought is was made for someone or some observatory.
Quote:WOW, It really is for sale. I thought is was made for someone or some observatory.
MarkLeica 8x20; Nikon Action 7x35; Vixen Apex Pro 8x42; Orion 15x63; Docter Nobilem 15x60WO Megrez II 80 FD / APM 107mm f/6.5 / Mewlon 210 on DM-6 + Berlebach Planet
JAWAID IQBAL ABBASI
The night sky is the canvas....
My optics are the brush....
The Milky Way is the masterpiece
reductio ad absurdum of epistomology is solipsism....
Quote:Having lugged 5" binoculars out to the back yard for donkey's years, I'm firmly of the opinion that a pair of 6", ideally built with light weight in mind, is the limiting aperture UNLESS you plan to leave the thing outside. If you want one-man portability AND more light grasp then it has to be commercial or home-built JMI-style reflectors, or a 'scope + binoviewer (a Dob if you must have low powers or an SCT if you like high mag). You couldn't GIVE me that 12", unless it came already installed in a decent observatory, in a property with great skies. Anything less would be a waste.
Quote:Quote:Having lugged 5" binoculars out to the back yard for donkey's years, I'm firmly of the opinion that a pair of 6", ideally built with light weight in mind, is the limiting aperture UNLESS you plan to leave the thing outside. If you want one-man portability AND more light grasp then it has to be commercial or home-built JMI-style reflectors, or a 'scope + binoviewer (a Dob if you must have low powers or an SCT if you like high mag). You couldn't GIVE me that 12", unless it came already installed in a decent observatory, in a property with great skies. Anything less would be a waste. I agree, if you don't live under a dark sky a 6" instrument is an excellent choice. I built such an instrument http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/3720212/page...with 160 mm f/6.5 oilpaced apo lenses, total weight 11.8 kg. Such an instrument can easily be transported to a dark side and hooked up to a mount. The big advantage compared to a bigger refractor with binoviewer, the large field, with 17 mm Ethos I get 1.6 degree TFOV at 65x maginification.Thomas
Quote:I'm surprised at you two not paying more attention to detail ! :-)