Bahtinov mask

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Conn Buckley
Posts: 230
Joined: Tue Aug 07, 2007 11:28 am
Location: Crecora, Co. Limerick

Bahtinov mask

Post by Conn Buckley » Fri Feb 12, 2010 9:33 pm

Got a bahtinov mask recently for the LX 200. When I bought it I expected that it would fit very precisely inside the outer rim of the tube. This mask was greater in diameter than the front lens and had 2 holes drilled in it (see image).
I tried it out the other night by using a couple of rawl plugs in the holes and hung it on the front of the scope after centering it. Moving it slightly did not seem to make any difference to the view through the eyepiece. Does anybody know if it has to be an absolutely perfect fit?
I took a 10 sec image of Sirius while using the mask and here is the result. Is that what a near perfect focus should look like?[/url]http://farm5.static.flickr.com/4023/435 ... e8.jpg[url][/url]http://farm3.static.flickr.com/2798/435 ... 9d9aa9.jpg

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Dave Lillis
Posts: 2757
Joined: Sun Aug 05, 2007 10:02 am
Location: Limerick city

Post by Dave Lillis » Fri Feb 12, 2010 9:39 pm

I dont know if it has to be absolutely perfectly centered, I made up one from laminated sheets of hard paper.
The image of Sirius looks perfect to me.
Looking at the mask I'm wondering is it for an RCX400 and not an LX200 ??
It would be worth emailing the manufacturer and asking them how its supposed to be used.
Dave L. on facebook, See my images in flickr
Carrying around my 20" obsession is going to kill me, but what a way to go. :)

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