Dew on the Primary???
- helicon Online
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Dew on the Primary???
I decided to leave the scope out over night and get up at 4:20 for a morning session. Ursa Major was well placed for observation but as I slewed towards M81/M82 I noticed the stars had rings around and them and were faint. The culprit was dew on the primary, which for me has been a very infrequent experience. Over night the humidity increased from 30% to 75% - I guess that was the problem. Should have used the fan I guess...
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
Naked Eye: Two Eyeballs
Latitude: 48.7229° N
- notFritzArgelander
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Re: Dew on the Primary???
- turboscrew
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Re: Dew on the Primary???
Not at?
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Telescope: OrionOptics XV12, Mount: CEM120, Tri-pier 360 and alternative dobson mount.
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- helicon Online
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Re: Dew on the Primary???
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
Naked Eye: Two Eyeballs
Latitude: 48.7229° N
- KathyNS
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Re: Dew on the Primary???
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Helena Observatory (H2O) Astrobin
- notFritzArgelander
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Re: Dew on the Primary???
Never at. It's too good a friend.
- notFritzArgelander
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Re: Dew on the Primary???
Neither do I. What hair I have I keep close cropped. My hair drier is battery powered and a dedicated astronomy accessory.
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