Hi,
I was testing my 90mm F10 refractor (D=90mm, F=900mm, refractor achromat) today, and I tried White light with a Baader filter first of all.
There was quite a lot of cloud but there was "sunshine" and I could get reasonable focus of sunspots and the limb (focus at 43mm + diagonal)
I then switched to H-alpha (Quark chromosphere eyepiece filter) and although focus was near, I did not get the limb really focused or surface details or proms. I tried various combinations of extension tubes and diagonals.
Should I wait until the sun is free of cloud or should I be getting reasonable surface detail and limb focus despite the cloud ?
Many thanks.
Magnus
Focusing sun through cloud ? 90mm refractor
- Radon86
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Focusing sun through cloud ? 90mm refractor
Solar: H-alpha": Quark Chromosphere filter; Baader white light filters
Scopes: Altair Astro Travel ED70mm (F 420mm, D=70mm);; Skywatcher 90mm (F 910mm D=90mm); GSO focuser;;Altair Astro 60mm guidescope (D=60mm,F=225mm)
Cameras: ASI120mm-S,ASI174mm
Mount: SW HEQ5 Pro, SW EQ3 Pro Synscan (SW = Skywatcher),Vixen Polarie tracker (portable setup)
Accessory: SW Auto-focuser
Scopes: Altair Astro Travel ED70mm (F 420mm, D=70mm);; Skywatcher 90mm (F 910mm D=90mm); GSO focuser;;Altair Astro 60mm guidescope (D=60mm,F=225mm)
Cameras: ASI120mm-S,ASI174mm
Mount: SW HEQ5 Pro, SW EQ3 Pro Synscan (SW = Skywatcher),Vixen Polarie tracker (portable setup)
Accessory: SW Auto-focuser
- marktownley
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Re: Focusing sun through cloud ? 90mm refractor
Hi Magnus
Yes, with the Quark wait until there is no cloud. Don't forget the 4,3x amplification on the quark with that scope means you are working at f43.
MArk
Yes, with the Quark wait until there is no cloud. Don't forget the 4,3x amplification on the quark with that scope means you are working at f43.
MArk
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- Radon86
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Re: Focusing sun through cloud ? 90mm refractor
Thanks Mark,
The cloud has now completely blocked the sky now, so I will try again later this week or Sunday.
Magnus
The cloud has now completely blocked the sky now, so I will try again later this week or Sunday.
Magnus
Solar: H-alpha": Quark Chromosphere filter; Baader white light filters
Scopes: Altair Astro Travel ED70mm (F 420mm, D=70mm);; Skywatcher 90mm (F 910mm D=90mm); GSO focuser;;Altair Astro 60mm guidescope (D=60mm,F=225mm)
Cameras: ASI120mm-S,ASI174mm
Mount: SW HEQ5 Pro, SW EQ3 Pro Synscan (SW = Skywatcher),Vixen Polarie tracker (portable setup)
Accessory: SW Auto-focuser
Scopes: Altair Astro Travel ED70mm (F 420mm, D=70mm);; Skywatcher 90mm (F 910mm D=90mm); GSO focuser;;Altair Astro 60mm guidescope (D=60mm,F=225mm)
Cameras: ASI120mm-S,ASI174mm
Mount: SW HEQ5 Pro, SW EQ3 Pro Synscan (SW = Skywatcher),Vixen Polarie tracker (portable setup)
Accessory: SW Auto-focuser
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