TMB Optical Planetary 4mm long eye relief 1.25" Eyepiece TMBP04

TMB Optical Planetary 4mm long eye relief 1.25" Eyepiece TMBP04 Reviews

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This 4mm TMB Planetary eyepiece was designed to provide exceptional high power/comfortable eye relief observing with long focal length refractors, reflectors, or catadioptric scopes under average or better seeing conditions. It is optimized to view bright objects, both on and off axis, while showing maximum contrast, detail, and definition. It has very high light transmission, very high contrast, minimal lateral color, and minimal light scatter.

Combine the high resolution of the 4mm TMB planetary with its high contrast and you have an eyepiece that's unexcelled for lunar and planetary observing and binary star splitting. While the 4mm TMB eyepiece is optimized for observing subtle lunar and planetary detail and contrast, the eyepiece works equally well for splitting close binary stars, resolving compact globular clusters, etc. The 4mm focal length of this TMB provides very probably the maximum power possible with an f/10 Schmidt-Cassegrain, as it gives a very high 62.5x per inch of aperture with such a scope. That's more than the 50x-60x per inch of aperture considered the maximum possible under excellent seeing conditions. It provides the 0.5mm exit pupil recommended as the minimum usable for maximum detail with an f/8 focal ratio refractor or reflector.

Eye relief, at 10mm, is quite good for an eyepiece with such a short focal length. Vignetting will only be moderate for those who must wear eyeglasses while observing. This usually won't be a problem when using the TMB Planetary eyepiece on the kinds of objects for which it was optimized - planets, binary stars, etc. - as these small objects are generally kept in the center of the eyepiece field, where your eyesight is sharpest.

For Dobsonian users and others without tracking drives, the very low lateral color and other aberrations of the 4mm TMB allow a planet to drift across its entire 58 degree field while still being sharp and having high cont

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Jul 07, 2011 16:56:05

Celestron EdgeHD 1100 Schmidt-Cassegrain Optical Tube

Celestron EdgeHD 1100 Schmidt-Cassegrain Optical Tube Reviews

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Celestron EdgeHD 1100 Schmidt-Cassegrain Optical Tube Feature

• Celestron 11" aperture aplanatic Schmidt-Cassegrain telescope produces astrograph-quality flat focal plane
• EdgeHD coma-free Cassegrain optics and a built-in field flattener ensures sharp focus all the way to the edge of the field
• Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around a mount
• Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror
• All EdgeHD optical tubes are Fastar compatible for imaging down to f/2 with optional accessories

Celestron's innovative new EdgeHD telescopes are aplanatic Schmidt Cassegrain models designed to produce aberration-free images across a wide visual and photographic field of view. Celestron EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt Cassegrain telescope. This guarantees you visibly sharp stars across some of the largest CCD chips available today. Superior edge performance not only creates rounder, more pleasing stars but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestron's High Definition optics you will be able to capture the faintest of galaxies all the way to the corner of your full frame camera chip. Coupled with Celestron's XLT coating group on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum. The EdgeHD tube has been redesigned with top-notch features to make sure you get the most from your optics each and every night. Mirror locks hold the mirror in place and reduce image shift when rotating the tube around the mount. Flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror, keeping the image centered in the eyepiece (or chip). Cooling tube vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 60 micron mesh filter guaranteed to let warm air out without letting dust in.

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May 14, 2011 02:12:04

Astro Tech 6" f/4 imaging Newtonian Optical Tube

Astro Tech 6" f/4 imaging Newtonian Optical Tube Reviews

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Astro Tech 6" f/4 imaging Newtonian Optical Tube Feature

• very fast f/4 focal ratio 6" Newtonian reflector optics
• contrast-enhancing extended tube length
• 2" dual-speed linear bearing Crayford focuser with 2" and 1.25" compression ring accessory adapters
• 8 x 50mm finderscope in a quick-release bracket
• dual split hinged mounting rings

This Astro-Tech Imaging Newtonian optical tube has:

This 6" Astro-Tech AT6IN optical tube is a very fast focal ratio f/4 reflector that has been optimized for very wide field deep space imaging. It can be used with 35mm cameras, DSLRs, web-cams, DSI-type cameras, and large format CCD cameras alike.

The light weight standard equipment mounting rings of the Astro-Tech Imaging Newtonian allow you to use it on a wide variety of dovetail plates and German equatorial mounts from the most basic to the most elaborate high payload go-to system.

In addition to deep space imaging, the Astro-Tech AT6IN is also usable for solar system imaging as well as deep space and solar system visual observing. Solar system visual contrast will be somewhat reduced compared to a longer focal ratio reflector because of the AT6IN's larger secondary mirror that has been optimized for full-field photographic illumination. However, the visual performance will still be much more than acceptable, and the 610mm focal length of this Astro-Tech makes it quite possible to achieve the high powers needed for detailed lunar and planetary observing. Simply add optional 1.25" or 2" eyepieces, and perhaps an optional Barlow lens, and this Astro-Tech Imaging Newtonian will provide you with crisp and sharply detailed close-up views of the Moon and planets.

This Astro-Tech Telescope's Optical System . . .

Newtonian reflector optics: 6" aperture, 610mm focal length, f/4 focal ratio. Parabolic primary mirror. Both primary and diagonal mirrors are ground and polished under computer control for guaranteed diffraction limited performance, coated with 91% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life.

The mirrors are made of B270 "water white" optical crown glass that is free of internal stress and striae. B270 glass is equivalent to

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May 08, 2011 05:21:04

Celestron EdgeHD 800 Schmidt-Cassegrain Optical Tube

Celestron EdgeHD 800 Schmidt-Cassegrain Optical Tube Reviews

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Celestron EdgeHD 800 Schmidt-Cassegrain Optical Tube Feature

• 8" aperture aplanatic Schmidt-Cassegrain telescope produces astrograph-quality flat focal plane
• EdgeHD coma-free optics and a built-in field flattener ensures sharp focus all the way to the edge of the telescope's field of view
• Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around a mount
• Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror
• All Celestron EdgeHD telescope optical tubes are Fastar compatible for imaging down to f/2 with optional accessories

Celestron's innovative new EdgeHD telescopes are aplanatic Schmidt Cassegrain models designed to produce aberration-free images across a wide visual and photographic field of view. Celestron EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt Cassegrain telescope. This guarantees you visibly sharp stars across some of the largest CCD chips available today. Superior edge performance not only creates rounder, more pleasing stars but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestron's High Definition optics you will be able to capture the faintest of galaxies all the way to the corner of your full frame camera chip. Coupled with Celestron's XLT coating group on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum. The EdgeHD tube has been redesigned with top-notch features to make sure you get the most from your optics each and every night. Mirror locks hold the mirror in place and reduce image shift when rotating the tube around the mount. Flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror, keeping the image centered in the eyepiece (or chip). Cooling tube vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 60 micron mesh filter guaranteed to let warm air out without letting dust in.

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Apr 05, 2011 20:22:04