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Are the BBHS coatings easy to clean? Do the coatings have a life comparable to your dielectric coatings? Do the coatings degrade over time and at what rate? Is there a difference in performance between your dielectric diagonal and the BBHS one, what are the differences and are they significant or very slight? I own an early Televue APO 4 inch refractor.
Question by: John on Sep 9, 2016 1:29:00 AM | 1 Answer(s)
In regards to this style of diagonal, please clarify T-2 fitting?..
Are the threads (standard) for say a 2inch telescope eyepiece that could directly attach to this unit from the bottom barrel of it? Yes or no? .if not what is the diameter/threading of a T-2 fitting?
Thanks Dennis
Are the threads (standard) for say a 2inch telescope eyepiece that could directly attach to this unit from the bottom barrel of it? Yes or no? .if not what is the diameter/threading of a T-2 fitting?
Thanks Dennis
Question by: Dennis Young on Dec 6, 2018 6:40:00 PM | 1 Answer(s)
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Baader BBHS ® reflective properties
Exclusively available on Baader Sitall Ceramic Mirrors and on selected Baader prism Star Diagonals: BBHS® reflection coatings predominantly are being utilised on our highest quality grade 2" BBHS® Sitall Stardiagonals (#2456115 – incl. black housing and 2" ClickLock clamp) as well as on the BBHS® T-2 Sitall Stardiagonal (#2456103) - where the housing features a male and female T-2 thread - for shortening the optical path with bino use, and to offer the utmost in adaptation variability as well as much more light throughput than with any conventional 1 1/4" star diagonal. BBHS® stands for Broad Band Hard Silver. When applied onto our Sitall (zero expansion glass-ceramics) substrates, these multiple deposited layers of hard silver are being sealed by a set of dielectric layers to achieve long term durability. With this advance in coating technology our BBHS® coating lifetime equals that of a high quality AlSiO2 coating, matching the durability of standard aluminium coated diagonals (and telescope mirrors) which have been in wide use for many years. The BBHS® spectral bandpass is much wider though, when comparing with our 50 layer all dielectric coatings utilized on the 2" ClickLock Star Diagonals. The all dielectric coating system on the 2" ClickLocks...
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Additional Information
| Manufacturer | Baader Planetarium |
|---|---|
| SKU (#) | 2456103 |
| Optical Design | Mirror Diagonal |
| Outer Connection (lens sided) | Thread, T-2 (M42 x 0,75) |
| Inner Connection (eyepiece/-camera-sided) | Thread, T-2 (M42 x 0,75) |
| Reflection surface | BBHS coated, Dielectrically protected |
| Image Orientation | Erect image, Mirror inverted |
| Optical length (mm) | 43 |
| Clamping System | no clamp |
| Deflection angle | 90° |
| Inner Diameter / Clear Aperture (mm) | 33 |
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