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Astronomy > Telescope accessories > Astrophotography > Masks > Focusing Masks > ASToptics > ASToptics Bahtinov focus mask 100 for 109mm to 145mm diameters
Product no.: 47309

Bahtinov focus mask 100 for 109mm to 145mm diameters

$ 28.90 incl. VAT plus shipping costs
in stock
ready for shipping in 24 h + lead time
There is a follow-up model for this product: ASToptics Focusing Mask Bahtinov acrylic 100-140mm
This product is available in the following variants:
Diameter (mm) Price
109 - 145 $ 28.90
120 - 152 $ 34.90
140 - 170 $ 34.90
175 - 212 $ 34.90
185 - 210 $ 45.90
212 - 252 $ 45.90
240 - 268 $ 57.00
67 - 87 $ 22.90
86 - 105 $ 22.90

Product description

The focusing mask according to Pavel Bahtinov facilitates precise focusing, which is particularly important in astrophotography. The mask is attached to the front of the tube or lens. When looking at a star, it produces a pattern of rays. When the long ray intersects the two slightly shorter rays symmetrically in the middle, the focus is correct. Thanks to its many opening slits, the Bahtinov mask can also be used with relatively dim stars. This is an advantage over the classic Scheiner mask.

A Bahtinov mask should actually be calculated separately for each aperture ratio. However, experience shows that one mask can be used very effectively for an entire aperture range.

How to attach the mask to the telescope: Each mask is supplied with a pair of bolts and fitting plastic covers. Just push the bolts through the holes in the mask and slide the covers onto the bolts from the other side. Now the mask can be simply hinged onto the dewcap or the telescope tube. This adaptation is very universal and fits for widely varying tube diameters.

Specifications

General


Colour
black
Diameter (mm)
109 - 145

Product safety

Manufacturer: NIMAX GmbH, Otto-Lilienthal-Str. 9, 86899 Landsberg am Lech, DE, www.nimax.de
ASToptics Bahtinov focus mask 100 for 109mm to 145mm diameters

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