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davidpitre
Carpal Tunnel
Reged: 05/10/05
Posts: 1826
Loc: Central Texas
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How do these 2 compare ?
Is there anything else in the same price and size class that is 90° ?
I'm interested in using these for low power extended bright and dark nebulae . I like the that the Garrett will give me more FOV and it's design looks as if it would cool quicker.
Will one vignette more with a 40mm plossl or 24mm Panoptic ?
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David
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Rich V.
Pooh-Bah
Reged: 01/02/05
Posts: 1395
Loc: Carson Valley, Nevada, USA
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They're two really different binoculars.
The Garrett is a copy of the Miyauchi design and is much more compact and lighter than the Obie, weighing in at a bit over 13#. It has smaller prisms with a rear prism aperture of around 22mm. Eyepieces with significantly larger field stops like the 24 Panoptic and the 32mm and 40 plossls (27mm FS) will likely vignette to some extent. I don't think you will find any eyepiece that will provide much over a 2.5° FOV. I don't know if the Garrett is operating at it's full 100mm aperture. (If anyone has measured this, I'd be curious)
The Obie is a larger, more robust binocular weighing in at almost twice that of the Garrett. It has larger prisms so it takes the larger FS 1-1/4" eyepieces without vignette. A 2.5°+ FOV is still about it's maximum, though. It may be operating at closer to 92mm according to recent posts in another thread about measuring effective aperture. It obviously needs a heavier mount to carry the extra weight. Most report very good sharpness to the edge of field depending of course, on the eyepiece used.(although EdZ recently acquired an astigmatic sample, IIRC.)
The Obie has more of a track record in the mini-reviews pinned to the top of the page than the newer Garrett model. Reading the provided links should keep you busy for a while. 
Neither is a substitute for a telescope if high magnification views are required, but they're nice for low-mid power views.
I'd love to read about a side-by-side comparison of the two myself!
Rich V
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Binoculars:
33/50/75/150x100 Saturn III, 16x70 FMT-SX, 10x50 PCF-V, 10x43 DCF-SP, 10x35 E2, 7x35 E, 8x30 E2, 7x26 Custom, 8x23AS Diplomat, 8x23 Travelite
Scopes:
C9.25, 6" f8 reflector, SV80S
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beachchairbill
professor emeritus
Reged: 11/06/08
Posts: 509
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Rich V,
Your right on the money and I would love to see that comparison myself.
Just as a reminder, not every model ep will fit into the GBT 100 and not sure if it is the same with the Obie.
Beachchairbill
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GlennLeDrew
Pooh-Bah
Reged: 06/18/08
Posts: 1304
Loc: Ottawa, Ontario, Canada
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I wouldn't be concerned about cool-down times, as one would be for a telescope. The low-to-mid powers of such an instrument will not be overly sensitive to temperature differences. On the contrary, my preference would be to have a bino which cools more *slowly*, so as to hold off dewing that much longer!
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Home-made Mk II RA bino, using interchangeable objectives and eyepieces
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