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Alcor Dimm Mask Ø52mm For Ota 10 To 12

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$1,908.00

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Diameter Ø52mm for OTA 10 to 12 Ø75mm for OTA 10 to 11

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Product description

This product is intended to be put at the telescope entrance, and provide a beam deviation, so that to produce two images of the same star, required for seeing measurement using Differential Image Motion Monitor (DIMM). The standard two holes mask is made of two Ø52 or Ø74 mm holes in a laser cut and black anodized aluminium plate. The mask is attached to the telescope.

One of the hole is equipped with a set of tunable prisms, allowing to adjust the two image of the same star at a given distance, to fit as best the field of view of the camera. The angle adjustment is achieved by rotating one of the part. Here are the optical specifications:

Diameter	Ø52	Ø72	Ø100
Material	BK7	BK7	BK7
Anti reflexion coating	MgF2	MgF2	MgF2
Surface flatness (PV)	λ/4	λ/4	λ/4
Deviation angle (min)	1 arcmin	0.7 arcmin	0.7 arcmin
Deviation angle (max)	9 arcmin	9 arcmin	9 arcmin
Thickness	12 mm	18 mm	22 mm
Limiting magnitude ⁽¹⁾	3.2	4.4	4.8