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Observing >> Variable Star Observing and Radio Astronomy

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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Photometric V filter sources? new [Re: gavinm]
      #5289126 - 06/25/12 08:45 PM

Hi Gavin: What method did you used to clean your filters, I suspect many on the forum would like to know.

Ed


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gavinm
Carpal Tunnel


Reged: 08/26/05

Loc: Auckland New Zealand
Re: Photometric V filter sources? new [Re: Ed Wiley]
      #5289382 - 06/26/12 12:17 AM

Will probably sound like sacrilege but I just use a lens cloth (on the V-filter). I have never cleaned my other photometric filters. I kept them pretty clean installing them and I am pretty pedantic about dust around the camera.

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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Photometric V filter sources? new [Re: gavinm]
      #5292163 - 06/27/12 08:17 PM

No sacrilege to my mind, Gavin. Thanks for sharing. I have heard everything from toothpaste to find abrasive.

Ed


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Tim Hager
member
*****

Reged: 02/19/06

Loc: New Milford, CT, USA
Re: Photometric V filter sources? new [Re: Ed Wiley]
      #5302557 - 07/04/12 04:17 PM

I've cleaned my Schuler V filter with a finger dipped in water and then a little red mirror polishing rouge left over from an old mirror kit. Then a rinse. I suppose cerium oxide will work too.

Incidentally, the B filter suffers from this problem too. The type of glass used in the B and V Schuler filters reacts with moisture in the air to form a coating which is easily washed or polished off.

...Tim


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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Photometric V filter sources? new [Re: Tim Hager]
      #5309028 - 07/08/12 09:56 PM

Thanks, Tim: I think that is what Arne Henden also uses. Toothpaste for me.

Ed


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Andean Slave
member


Reged: 01/08/11

Re: Photometric V filter sources? new [Re: gavinm]
      #5513335 - 11/10/12 03:36 PM

Quote:

The filter crystalisation is not an 'old' filter problem, but a 'cheap' filter problem. Due to the type of glass substrate being exposed to the air, more expensive filters have dielectric coatings (or similar) that obviously push up the price.

Mine is the cheaper AAVSO version which does suffer from this, but it cleans off easily.




..bit of a lay view there, it's a known phenomenon to users of the Schott glasses and others too.

The solution is a solution: Balzers Plastic Polish

..btw Arne Henden gave _everyone_ a V filter lol


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gavinm
Carpal Tunnel


Reged: 08/26/05

Loc: Auckland New Zealand
Re: Photometric V filter sources? [Re: Andean Slave]
      #5513725 - 11/10/12 09:41 PM

Quote:



..btw Arne Henden gave _everyone_ a V filter lol




I know... lol back


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