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To control the amount of heat applied to the corrector place
Etalon Material: UV Grade Fused Silica
split foam provides proper size and depth for holding many different eyepiece types and accessories
Features multi-coatings
2021 under a brightly moonlit sky (Moon 12 days old)
Askar 52 mm f/4 Guide Scope - Black - 52F4GS-B type-cameras-and-imaging-accessories To control the amount ofAskar 52mm f 4 Guide Scope in Black The Askar 52mm F4 Guide Scope is lightweight, compact, and stable. The large aperture is 164% larger than that of the Askar 32mm F4 guide scope, with the substantial increase of light the limiting magnitude can reach 10. 4. The optical design of the doublet objective lens, as well as the precise X&Y axis fine adjustment, gives this 52mm f 4 guidescope great accuracy and stability while the OTA weighs in at only 0.
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