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Old 27-01-2007, 01:39 PM
Stephan
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Stephan is offline
 
Join Date: Jan 2005
Location: Newcastle
Posts: 151
Another Baader sale !

I need to raise funds for some new purchases:

Therefore I have a 3.5mm Baader Hyperion eyepiece for sale.
It’s as new and hardly used.

$165 posted within Australia.

Here all detailed specifics about the Baader Hyperions:


Characteristics for visual use:
Optimal 68° apparent field of view, the largest accessible to the stationary human eye.
The annoying „kidney bean effect”, the bane of many ultra wide-field eyepiece designs, is completely absent in the Hyperion.
8 lens elements in 5 groups provide outstanding sharpness and color correction over the entire field.
Comfortable eye relief of 20 millimeters.
No vignetting or falloff of illumination near the edge of the field.
The use of high-index glasses results in minimal distortion and astigmatism.
Unsurpassed color fidelity. Many eyepieces that employ cheaper glasses or inferior designs impart a yellow or blue cast to the image. With Hyperion eyepieces white stays white!
The most advanced anti-reflection multicoatings are employed on all ten air to glass surfaces for maximum light throughput and brilliant images.
All coatings are carefully matched to the index of refraction for each of the different glass substrates used.
The painstaking design and execution of baffling has all but eliminated troublesome stray light and ghost reflections. Don’t take our word for it – test it for yourself! Put a Hyperion eyepiece and your own eyepieces onto a matte black surface and allow a beam of sunlight or an intense artificial light source to shine into the eyepieces from above.
Looking into the eyepieces from some distance you will note that some eyepiece interiors will shine milky white with stray light, resulting in a „flat” image with reduced contrast. Not the Hyperion! Under all conditions of illumination, the interior of a Hyperion eyepiece will appear jet black, testimony to the virtual elimination of stray light.
Shortest field stop position of all widefield-eyepieces known to us. Specifically designed for binocular viewing
Ideal for use with accessory binocular viewers thanks to a tight barrel diameter (58 millimeters with the removable neoprene rubber grip ring, 56 millimeters with the grip ring removed) that permits interpupillary distance settings of as little as 56 millimeters, permitting stereo wide views even for kids.
Each Hyperion eyepiece in the series is actually two eyepieces in one!
Simply by unscrewing the forward 1.25-inch diameter portion of barrel that houses the negative achromat lens group, will provide a wide-field eyepiece of much longer focal length. Color correction remains excellent, and the field curvature that results is no greater than in a decent specimen of the 6-element Erfle design (and that’s what it is actually, whenthe negative achromat is removed).
Removing the negative lens group exposes an M 48 female thread at the end of the 2-inch diameter barrel of the long focal length component so that large-format light pollution and nebular filters can be employed.

Characteristics as a Projection Ocular:
For afocal projection imaging, the digital camera threads S 54 and M43 x 0,75 have been incorporated for compatibility with our Series 54 digital T-rings that permit attaching almost any digital and video camera without vignetting. These threads are protected by caps when not in use.
The M 43 x 0,75 thread directly screws into many video cameras, notably the recent 3 CCD-Cameras manufactured by Panasonic. Our series of S 54 digital T-adaptor rings screw directly into the filter thread of most digital cameras and digital camcorders.
Some camera models equipped with exposed, movable zoom lenses will require a separate intermediate (filter) adaptor available from the manufacturer. However, the vast majority of large digital cameras and camcorders of recent vintage feature an internal zoom lens with a fixed front lens and standard filter threads.
The robust construction of Hyperion eyepieces is capable of directly supporting heavy video and film cameras weighing up to 3 kilograms. Hyperion eyepieces are also ideal for use with so-called clamping-style universal digital camera holders like the Baader Microstage # 2450333, and will precisely support cameras squarely with respect to the optical axis, due to their straightforward cylindrical shaped outer body.
With or without the removable negative lens group, the Hyperion eyepiece is an incredibly sharp projection system.
In combination with a short-focus objective as small as 60mm aperture, the same afocal imaging configuration can be employed in industry for monitoring hazardous operations like plasma welding from a safe distance.

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