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 Post subject: finder scope
PostPosted: Sun Jan 04, 2015 3:22 pm 

Joined: Fri Oct 10, 2014 8:12 am
Posts: 121
Location: earby lancs
Hi I keep getting dew on my finder scope so locating stars starts becoming harder as there ruled down I don't want to wipe it due to damaging the lens would it be good practice to put the dust caps back on the finder scope between locating objects

Skywatcher 200p explorer EQ5 mount synscan upgrade kit
Nikon D3100

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 Post subject: Re: finder scope
PostPosted: Mon Jan 05, 2015 11:08 am 

Joined: Mon Jan 09, 2006 11:05 am
Posts: 5018
Location: Lancashire
Outside of the summer months, dewing can be a problem. A basic requirement is to make sure that the dew shield is long enough. The manufacturers often make them too short.
I make mine protrude three times further than the diameter of the finder's objective. As you said, try capping the finder objective between use.
Before capping, it helps to insert a warm cotton cloth inside the shield to absorb the dew.


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