Baader Hyperion 21mm 1.25: £92.99

High Quality 68 Degree Eyepiece

Modular dual 31.7mm/50.8mm widefield eyepieces that performs as well as eyepieces three times its price.

Will work in conjunction with a Baader adaptor ring to mount a camera directly onto the eyepiece.

Characteristics for visual use:

Optimal 68° apparent field of view, the largest accessible to the stationary human eye.

The entire field remains visible despite the slight involuntary motions of an observer’s head that simply can’t be avoided.

The 80°+ apparent fields of many other eyepiece designs may sound very appealing on paper, but the need for the observer to slavishly maintain an eye position precisely on the optical axis is seldom if ever mentioned.

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, when the 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.

Thanks to the short 1.25 chrome sleeve of 0.94”, all Hyperion’s are principally compatible with spotting scopes, including high-end units by Leica, Swarovski, and Zeiss. For Zeiss Diascope models we already offer an 1.25-inch Diascope-Bayonet Adaptor

Please note that stock levels do fluctuate so please call or email to check today's stock before placing your order.

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Suggested accessories for this product.

*** Click product name for details ***

• Baader 14mm Hyperion Fine Tuning Ring  £12.00  Add to cart
• Baader 28mm Hyperion Fine Tuning Ring  £14.00  Add to cart
• Baader Diascope Bayonet 31.7mm ocular adapter  £34.99  Add to cart

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