Re: Scopes dripping wet


Mark D wrote:
> I have found that even a short bag over the dewshield/lens, and another
> short bag over the entire focuser (with a DDCAP in it), with 2 rubber
> bands
> on each end sealing the bag to the scope, works great.
> Sure, moisture condenses all over the outside of the tube assembly for a
> while, but the bagged ends stay dry.
> ======================================
> Exactly. Provided the OTA doesn't look like a piece of swiss cheese, no
> way can the mositure enter the scope at the center of the tube. It is
> as you say, the ends of the OTA that need to be shielded for all
> practical purposes of keeping the optics themselves dry.
>
> If it was a quite long, large 225mm F-9 TMB or larger Refractor, you
> might be hard pressed finding a long enough bag/bags to seal/protect the
> entire OTA anyway.
>
> Now if it's a smaller-shorter scope, such as a Televue Pronto, C-8,
> C-11, or the like, there's no problem at all covering-sealing the entire
> OTA (and even Forks/Drive Base) in a bag.
> Mark

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

.

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