Focusing Aids

Bahtinov Mask | "easy-sharp" Focusing Mask | Links

Both with my Atik Infinity camera and when photographing with the projection method, I have problems with focusing the telescope reliably. I therefore bought two focusing aids on the AME2018 astronomy fair in Villingen-Schwennigen, Germany: a Bahtinov mask from Lacerta and an "Easy-sharp" focusing mask from noctutec. I will report my experiences as soon as there are any..

 

Bahtinov Mask

Photo: Bahtinov mask (Lacerta, for 150 mm aperture), delivered with 3 clamps

From the product description (from Astrogarten, translated):

How to use the mask (from Astrogarten, translated):

A photo of what a correct setting looks like can be found on the product page on the Astrogarten Website (author: Nils Kloth).

I will report my experiences as soon as there are any available... At my first attempt with this mask I saw the "spikes", although not always evenly bright. The focusing with the Bahtinov mask seems to have worked to some extent. But this was just a short test on the eyepiece. The "easy-sharp" mask, which I also tested, seemed to be more "stable" and easier to adjust.

 

"easy-sharp" Focusing Mask

Photo: "easy-sharp" mask (noctutec, for 150 mm aperture)

Description (from noctutec, translated):

Procedure (from noctutec, translated):

Photos of how to approach a correct focus can be found on the product page of the noctutec Website (provided by the Volkssternwarte Köln).

I will report my experiences as soon as there are any available... At a first attempt with this mask, I saw the above-mentioned three stars offset by 120°, and also how they superimposed. Focusing with the "easy-sharp" mask seems to have worked. But I cannot remember the 6 spikes anymore... Anyway, this was just a short test on the eyepiece. The "easy-sharp" mask seemed to be more "stable" and easier to adjust than the Bahtinov mask, which I also tested. That is what the advertising claims!

By the way, the mask was too tight to fit into the tube of my Explorer 150PDS. That is why I temporarily held it by hand. This was announced to me by the dealer when I bough the mask. Now I have to sand some plastic corners...

 

Links

 

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10.09.2018