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A challenge?
- DaveGrennan
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- IFAS Astronomer of the Year 2010
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17 years 4 days ago #58576
by DaveGrennan
Regards and Clear Skies,
Dave.
J41 - Raheny Observatory.
www.webtreatz.com
Equipment List here
Replied by DaveGrennan on topic Re: A challenge?
One Problem Guys, The image would need to be several degrees wide to capture saturn and the galaxies. At that scale saturn would appear as no nore than a starlike object. Would certainly be pretty though.
Regards and Clear Skies,
Dave.
J41 - Raheny Observatory.
www.webtreatz.com
Equipment List here
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- philiplardner
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- Red Giant
17 years 4 days ago #58605
by philiplardner
IIRC the Skylux is a 70mm refractor, so you should be able to use magnifications up to around 150x depending on the seeing. A 2x Barlow is certainly one way of increasing the number of magnification steps you have at your disposal even if the top magnification is OTT!
Magnification is worked out by dividing the focal length of the telescope by the focal length of the eyepiece. You can usually push the magnification up to around 50x per inch of aperture. Your minimum useful magnification is around 10x (70mm aperture divided by 7mm maximum exit pupil.) As I don't know the focal length of the Skylux you'll have to work out what eyepiece will give you 10x for yourself!
Phil.
Replied by philiplardner on topic Re: A challenge?
One more question.... Is there much point in getting a 2x Barlow for the Skylux, or should I wait until I get a bigger scope for that? Brand new they seem to be around €50 which is almost as much as the telescope so I'm in no hurry to buy one anyway.
IIRC the Skylux is a 70mm refractor, so you should be able to use magnifications up to around 150x depending on the seeing. A 2x Barlow is certainly one way of increasing the number of magnification steps you have at your disposal even if the top magnification is OTT!
Magnification is worked out by dividing the focal length of the telescope by the focal length of the eyepiece. You can usually push the magnification up to around 50x per inch of aperture. Your minimum useful magnification is around 10x (70mm aperture divided by 7mm maximum exit pupil.) As I don't know the focal length of the Skylux you'll have to work out what eyepiece will give you 10x for yourself!
Phil.
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- dave_lillis
- Offline
- Super Giant
17 years 3 days ago #58646
by dave_lillis
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor
Replied by dave_lillis on topic Re: A challenge?
My thoughts exactly.One Problem Guys, The image would need to be several degrees wide to capture saturn and the galaxies. At that scale saturn would appear as no nore than a starlike object. Would certainly be pretty though.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor
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