Re: Scopes dripping wet
- From: mmd49@xxxxxxxxx (Mark D)
- Date: Fri, 30 Dec 2005 15:42:51 -0700
Mark. If a pronto for example is not sealed in a bag after observations.
Does the condensation reach the inner surface of the lens behind the
front? When this happens. Do you have to open the lens cell and clean
the lens behind. Or does condensation only occurs at the front element?
I'm asking this because if I'd get the FC-100 and the fluorite being
uncoated at the back. I couldn't wipe it with any clothe because
uncoated fluorite being soft, it can leave mark permanently. For example
if you touch the rear fluorite uncoated element with your fingers. It
would leave permanent fingerprint mark.
Mango
======================================
Hi Mango,
While it will be a rarer occurence of the Inner lens becoming wet with
condensation, yes it can still happen, even though the scope may be
placed in its case, or even such a case as a ultra heavy duty Scopeguard
Case.
I had something like this happen with my own Apomax Refractor once after
an Astrofest Star Party (2000).
When I left the event, I cased the Scope in its Hard Foam Lined Case.
Upon getting Home, and bringing the scope into the house, and opened the
case to wipe it down-wax the tube, and put this baby to bed for storage,
I had noticed the Scope was literally drenched, although the scope was
put into the case bone dry.
With the Apomax refractor, The Lens Cell, Billet Machined Screw On Lens
Cap, and Focuser-Focuser Counter are Rubber O-Ringed, and while I didn't
experience any condensation on any of the Optical surfaces, the rest of
the Scope was soaked.
The moisture can condensate on any glass surface, including the outer
surface of the inner Lens element, as the inside of the tube naturally
will not be zero humidity after you get through using it for the night.
(Hope this hasn't confused you)
This is why products such as the DDCAP made by Particle Wave
Technologies was brought to market, to prevent, and lessen this chance
of occurence. Plus the anodized Billet machined DDCAP, available in
either 1-1/4", or even better yet, the larger 2" model is sure a lot
nicer looking than a plastic cap, and serves its function to
reduce-eliminate internal moisture.
The DDCAP unscrews apart, and the Silica Gel Compound can be
periodically recharged, and/or replaced.
Sorry if I sound like an advertisement, I have no affiliation with the
company, but this is a really nice product, and a good investment,
whether you have a Refractor, an SCT, an MCT, or even a MNT Scope. Mark
.
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