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The advantages in a nutshell:
• High Degree of Finish
The material is all aluminum, black anodized, with a high finish, make the product more qualitiable.
• Thread for Eliminating Light
The interference of stray light is effectively reduced, which not only improves the brightness of the image, but also effectively reduces the formation of dark edge and makes the edge details of the image clearer.
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Features
• View of 45-Degree
• Standard 2 " diameter
• Prism clear aperture: 31mm
• Entirely machined aluminum
• 2"-1.25" adapter with brass compression rings
• Image erecting BAK4 prism with anti-reflection coating
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• Precision Prism
Image erecting BAK4 prism with anti-reflection coating, high quality optical prism inside rather than a mirror which makes your image clear and sharp. As optical quality here is critical, you should really use a high-quality prism. High accuracy and high light reflection prism, good for astronomical viewing, you can get a real original image.
• Anti-reflection Coating
Internally matte blackened and threaded for no internal stray light reflection. The interference of stray light is effectively reduced, which not only improves the brightness of the image, but also effectively reduces the formation of dark edge and makes the edge details of the image clearer.
• Correct Upside Down Image
This wide 90 degree angle makes you view correct image from telescope stand,makes it easier to observe.
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Brass Ring Design
Improved attachment design features a brass clamping ring which does not mar, and provides a more secure connection.
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2''-1.25" Adapter
31mm - 2"-1.25" adapter. Both 1.25-inch and 2-inch eyepieces can be used to better meet customer needs.
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Chromed Thumbscrews
Large, chromed thumbscrews, which make the connection more firm, more stable and more convenient to use.
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Astromania 2" 45-degree erecting prism diagonal for telescope
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Astromania 1.25" 45-degree diagonal prism optical prism inside
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Astromania 2" 90-degree mirror diagonal with 93% reflectivity
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Astromania 2" 90-degree diagonal 99%
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Astromania 2" SCT 90-degree mirror diagonal with 93% reflectivity
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Connection (to the telescope)
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2''
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1.25'
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2'
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2''
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2''
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Viewing posture
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45°
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45°
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90°
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90°
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90°
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Coating of optical system
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Fully-multi-coated
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Fully
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Dielectric
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Dielectric
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Dielectric
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Correction of vertically revers-ed image
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Yes
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Yes
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-
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Yes
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-
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Correction of horizontally revers-ed image
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Yes
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Yes
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-
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-
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Ring clamp
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Yes
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-
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Yes
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Yes
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Yes
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Filter thread
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Yes
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Yes
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Yes
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Yes
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Yes
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Type of build
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Amici prism
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Amici prism
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Diagonal mirror
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Diagonal mirror
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Diagonal mirror
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Type
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Deviating optics
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Deviating optics
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Deviating optics
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Deviating optics
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Deviating optics
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Other contents
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2" to 1.25" Eyepiece Adapter
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-
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Extension tube
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SCT Adapter
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Qualifies Towards Free Ground Economy Shipping (CONUS Only) For Most Orders Of $149 Or More