Re: [ATM] Lining a newtonian with cork - information required

["Thomas Janstrom" <thomas@moiler.com>]

Hi, 

Where in Oz are you? I'm in QLD.

I saw some very thin cork (almost thick art card thickness) sheets at an
art supplier recently, I just can't quite recall where exactly, but
maybe you'll have some luck with art shops?

Cheers, Thomas.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
Of Think
Sent: Friday, 16 June 2006 9:11 AM
To: ATM@atmlist.net
Subject: Re: [ATM] Lining a newtonian with cork - information required

Sorry Tony, I forgot to mention it is a metal tube. I have yet to
research
baffles properly (most of the pages that I get linked to are missing
these
days, including the one in the lists FAQ), they may be another option.

I have already contacted Protostar about their tube liners, though
unfortunately the couriering costs to get them to Australia are
astronomical.

Thank you for the reply.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
Of
tony gondola
Sent: Thursday, 15 June 2006 11:40 PM
To: ATM@atmlist.net
Subject: Re: [ATM] Lining a newtonian with cork - information required

You didn't say what your tube is made of. If it's metal then a cork
lining 
may help. It would be even better with an air space between the inner
tube 
wall and the liner. ProtoStar now sells a sleeve just for this purpose:

http://www.fpi-protostar.com/tubeliner.htm

IMO the best way to eliminate tube currents is to eliminate most of the 
tube. If doing that isn't an option the addition of proper flocking or 
baffles will increase contrast. Make sure the bottom of the tube is open
so 
you can get good air flow to cool the mirror. Lastly consider adding a
fan 
that pulls air in from the top of the tube and out the back.

Tony



----- Original Message ----- 
From: "Think" <thiink@gmail.com>
To: <ATM@atmlist.net>
Sent: Thursday, June 15, 2006 2:33 AM
Subject: [ATM] Lining a newtonian with cork - information required


> Hello list,
>
> I am going to attempt to line the inside of my solid tube 10" F/5 Guan

> Sheng
> branded Dob/Newt and require the expertise of you fine people. The 
> specific
> questions I have are as follows:
>
> - is lining the tube with cork still an effective method of 
> slowing/stopping
> tube currents? Are there better options?
>
> - I have searched in both Google, and around this list and have yet to

> find
> specifics on how to adhere the cork to the tube, or if this is at all
> required?
>
> - The mirror is 10", and the tube OD is 12". If I use 4mm cork tiles 
> (joined
> together for the length/height required), I take it this should have
no
> impact on the light path/other?
>
> - is there any caveats in regards to painting cork flat black instead
of
> using flocking paper? Is flocking paper a better idea?
>
> If anyone has any good websites/books (that are available in
Australia) 
> that
> can answer these questions; that would be great as well.
>
> Thank you all for reading,
> Simon
> NSW, Australia
>
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/ 

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