Re: [ATM] Refractor Lens Cell

[Pete <lenses@adelphia.net>]

Hi Alfredo,
Some comments on the staining of the F2 element.
Spray it with clear laquer and then tape it to protect the surface.
The laquer will come off easily with alcohol and do a good job of 
protecting the surface.
OR, if you have access to plastic tape it shouldn't stain the surface.
Depending on how badly its stained you might be able to lightly go over 
the surface using cotton balls with a liittle
polishing compound to remove it.
Hope this helps,
Peter Nance, Jr.
lenses@adelphia.net
aneves@snowsoft.biz wrote:

>HI,
>
>I meant a cell with push-pull screws to align it to the tube. I mean to have the cell machined, but a simple cell with no alignment options is alot easier and cheaper than a two part cell!  I've have not set up a web site yet on my ATM activities. I do have it planned for the near future. The only real problem I have run into so far was stanning of the F2 when I masked it with the brown packing tape so I could polish the other side. I left it overnigh and when I removed the tape I say three dark lines on the glass where the edges of the tape met the glass!! I will have to repolish that side later on.
>
>Regards,
>
>Alfredo
>
>----------------------------------------
> From: wb0poq@visi.com
>Sent: Tuesday, July 12, 2005 12:59 PM
>To: "aneves@snowsoft.biz" <aneves@snowsoft.biz>
>Subject: Re: [ATM] Refractor Lens Cell 
>
>Quoting "aneves@snowsoft.biz" :
>
>  
>
>>Hi,
>>
>>I just polished out my 7.5" achromat and the next stage is a cell to be able
>>to test the lens. Since I made a fraunhofer type lens, do I need to make an
>>adjustable cell or will a simple cell do? From what I've read the fraunhofer
>>does not need an adjustable cell!
>>
>>    
>>
>I would *certainly* recomend a cell that would allow you to align the lens
>assembly with the tube. If you are asking about a cell to allow for alignment
>of the crown and flint, that may be a bit more forgiving in a Fraunhofer (I
>really don't know), but my experience suggests life is easier if this can be
>done.
>BTW, do you have any details of your grinding/polishing/testing process posted
>anywhere, such as on a Web site? I have made a couple of objectives and would
>love to see how you went about it. I'm always ready to learn. :))
>
>Bob
>
>
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>
>  
>

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