#21  
Old 29-04-2015, 07:09 PM
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Logieberra (Logan)
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Originally Posted by Slawomir View Post
All of my 12nm Astronomik's (3 narrowband filters) are rattling around.
Really! Is there a tech explanation why that might be?

My Astronomik LRGBs don't and my sold Astronomik 12nm didn't... how strange!

Big Mike, pls rattle that Ha 6nm
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  #22  
Old 29-04-2015, 08:16 PM
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Slawomir (Suavi)
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Originally Posted by Logieberra View Post
Really! Is there a tech explanation why that might be?

My Astronomik LRGBs don't and my sold Astronomik 12nm didn't... how strange!

Big Mike, pls rattle that Ha 6nm
I don't think it matters for narrowband filters, but a rattling Lum filter could potentially cause some extra unwanted effects due to filter-glass being at a non-right angle (that would vary throughout the night with different telescope orientations) to incident rays and thus acting as a rectangular prism.
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  #23  
Old 29-04-2015, 09:04 PM
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Do they need spacers? I had some 50mm square ones and they are only 1mm thick and most filters are 3mm thick. Without the spacers they rattled around in the filter wheel and got damaged.

Later Gerd sold me spacers for them once they were ready which they weren't when he sold them to me, plus they cost $100. I still haven't forgiven him for that unprofessionalism.

Greg.
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  #24  
Old 30-04-2015, 03:09 PM
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Called the good people at Bintel. Sending me a replacement. Apparently they have a tool for this trick.
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  #25  
Old 30-04-2015, 03:11 PM
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Logieberra (Logan)
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Originally Posted by gregbradley View Post
Do they need spacers? I had some 50mm square ones and they are only 1mm thick and most filters are 3mm thick. Without the spacers they rattled around in the filter wheel and got damaged.

Later Gerd sold me spacers for them once they were ready which they weren't when he sold them to me, plus they cost $100. I still haven't forgiven him for that unprofessionalism.

Greg.
I don't think so Greg. Would be a right pain in the +% if they did.
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  #26  
Old 30-04-2015, 03:41 PM
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Called the good people at Bintel. Sending me a replacement. Apparently they have a tool for this trick.
Good to know it can be rectified
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  #27  
Old 30-04-2015, 03:57 PM
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Originally Posted by Logieberra View Post
Called the good people at Bintel. Sending me a replacement. Apparently they have a tool for this trick.
Oh its probably the little ring that holds the filter in needs to be tightened if this is a mounted filter. They usually have 2 little slots at either side for a tool to grab on and tighten or you could carefully use a kitchen knife if you are game.

Greg.
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