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Dome or Roll-Off
- dmcdona
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17 years 11 months ago #39076
by dmcdona
Dome or Roll-Off was created by dmcdona
Folks - anyone have pluses/minuses for domes and roll-offs based on Irish weather conditions (including high winds!)?
Cheers
Dave
Cheers
Dave
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- phoenix
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- Red Giant
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17 years 11 months ago #39080
by phoenix
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
Replied by phoenix on topic Re: Dome or Roll-Off
Dave,
I have the roll off and have been c***ing myself about the recent storms. I did anchor it at each corner and so far its OK. You do loose a lot of the horizon with the shed walls and thats why I also have a cg5gt mount for those low down targets. I am still much more comfortable inside the shed though.
Kieran
I have the roll off and have been c***ing myself about the recent storms. I did anchor it at each corner and so far its OK. You do loose a lot of the horizon with the shed walls and thats why I also have a cg5gt mount for those low down targets. I am still much more comfortable inside the shed though.
Kieran
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
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- astroguy
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17 years 11 months ago #39102
by astroguy
LX 200 GPS, Williams optics 80mm APO, Meade LPI, Canon 300D, Skymap pro, Lunar phase pro, Image plus, Exploradome.
Replied by astroguy on topic Re: Dome or Roll-Off
I have decided for Dome exactly because of the wind protection that gives. There is many a clear night here in south-west cork with a good breeze. Especially if I use a dew shield my scope is susceptible to strong winds.
Regards
Jouke
Regards
Jouke
LX 200 GPS, Williams optics 80mm APO, Meade LPI, Canon 300D, Skymap pro, Lunar phase pro, Image plus, Exploradome.
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- dmcdona
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17 years 11 months ago #39105
by dmcdona
Replied by dmcdona on topic Re: Dome or Roll-Off
With the 8" on the AP1200, even strong breezes weren't an issue. With the C14 on board though, that may be more of an issue - especially with the dew-shield on.
I'm hoping tonight will be clear with a bit of wind so I can judge the impact of the new OTA on the mount and see if wind is more of an issue than with the 8"
Domes are rather more expensive than roll-offs and more tricky when it comes to automation - but they do seem to give better wind protection.
Also, when we move to Galway, I don;t want to have buy something new
If Eamonn A, Jeff and Dave L are around, your experiences would also be useful...
Cheers
Dave
I'm hoping tonight will be clear with a bit of wind so I can judge the impact of the new OTA on the mount and see if wind is more of an issue than with the 8"
Domes are rather more expensive than roll-offs and more tricky when it comes to automation - but they do seem to give better wind protection.
Also, when we move to Galway, I don;t want to have buy something new
If Eamonn A, Jeff and Dave L are around, your experiences would also be useful...
Cheers
Dave
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- philiplardner
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- Red Giant
17 years 11 months ago #39109
by philiplardner
Replied by philiplardner on topic Re: Dome or Roll-Off
Domes will give you much better wind and stray-light protection but they also have their drawbacks. If you intend to observe from inside the dome then you will need to have temperature-controlled forced air circulation to prevent the dreaded "dome effect" caused by the body heat of the observer. Making the dome much larger than necessary helps minimise this. The dome aperture/slit *needs* to be *at least 1/3* of the diameter of the dome. Otherwise you will run in to problems with warm air exiting the dome at the margins of the slit and interfering with the light path. I have opted for the over-kill solution and am going for a 5m dome... but this has it's own set of problems - weight!
Phil.
Phil.
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- dmcdona
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17 years 11 months ago #39133
by dmcdona
:shock:
Replied by dmcdona on topic Re: Dome or Roll-Off
am going for a 5m dome
:shock:
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