minty Posted December 8, 2005 Share Posted December 8, 2005 hi ive got a 114mm newtonian scope but would like advice on min specs to get good detailed views of planets, should i go for another newtonian? what size? or should i go the dobsonian rote? all advice will be welcome as i wish to make a well informed purchase of a new scope. thank in advance to all who can help. Link to comment Share on other sites More sharing options...
Ant Posted December 8, 2005 Share Posted December 8, 2005 Welcome Minty, The answer really depends on the budget! If cost is a factor then a 8" F8 Dob will do the trick I think. If not maybe a SCT or APO refractor - but then you're talking loads a money Are you going to be wanting to take images in the future....? If so then the mount is vital and a dob won't do.CheersAnt Link to comment Share on other sites More sharing options...
OXO Posted December 8, 2005 Share Posted December 8, 2005 [glow=green,2,300]Welcome to the Forum Minty![/glow]Like Ant says it depends on your budget and what you wish to do with your scope be it imaging,Planets, Deep sky Objects or a mix of all of them?James Link to comment Share on other sites More sharing options...
Rob Posted December 8, 2005 Share Posted December 8, 2005 Welcome to the forum!Rob Link to comment Share on other sites More sharing options...
Jamie Posted December 8, 2005 Share Posted December 8, 2005 Welcome minty hope you find the right scope. Link to comment Share on other sites More sharing options...
tom.yates Posted December 8, 2005 Share Posted December 8, 2005 HI MINTY, Welcome as far as the scope goes if i was starting out again i would go for a 8" F6 on a GPDX WITH DRIVES Perhaps a bit expensive but you would be set for years just my humble opinion.Regards Tom. Link to comment Share on other sites More sharing options...
FLO Posted December 8, 2005 Share Posted December 8, 2005 ... would like advice on min specs to get good detailed views of planets, should i go for another Newtonian? what size? or should i go the Dobsonian rote? Welcome aboard Minty,For planets, you will need a long focal length (for higher magnification) and a small central obstruction (for greater contrast). The two together produce a 'slow' focal-ratio ... about f8 or more.There aren't many Newtonians that fit the bill though the new Orion Optics (UK) Europa 150 f11 springs to mind:http://tinyurl.com/7rxpzAlternatively, consider a Maksutov Catadioptric with at least 4" of aperture. Something like this:http://tinyurl.com/azb33Or this:http://tinyurl.com/cmxo4Or, if you have really deep pockets you might consider this:http://tinyurl.com/dfjcqIt does of course depend on your budget and other requiremants you might have.Hope that helps,Steve Link to comment Share on other sites More sharing options...
CELESCOPE Posted December 9, 2005 Share Posted December 9, 2005 welcome Minty , a sct for me at F10 and can be reduced for DSOs as well and all round good performer, i use the Celestron GPS8 have two of them , the drives are very accurate and the scope performs very well , the go to system is spot on , and the optics are good as well ,Cheers Rog Link to comment Share on other sites More sharing options...
daz Posted December 10, 2005 Share Posted December 10, 2005 Hi minty and welcomeYou've already had 2 tonnes of advice, so there's nothing more to add there..... Link to comment Share on other sites More sharing options...
The Warthog Posted December 11, 2005 Share Posted December 11, 2005 You've had lots of advice, but that doesn't stop me from putting my oar in. I have a 114mm reflector. Infact, I have two. I started with a Meade f/8, and as I got more sophisticated, I realized that I had a problem with my mirror, to wit: it was a spherical mirror, not a parabolic one. I had already improved my views dramatically by buying better eps, and whe I went to a star party last year, an American correspondent of mine brought along his Tasco 4.5". I had a look through it, and it was immediately obvious that the view was much better at high magnifications (>150x) So I bought it, and now use it almost exclusively. I have been able to see detail on Mars, and much detail on Jupiter. The Cassini division in the rings of Saturn still eludes me, but I can sometimes see surface markings on Saturn. Either of the two scopes is fine for DSOs, within the limits of magnitude.You can doe quite a lot with that scope, with some extra eps and patience. Link to comment Share on other sites More sharing options...
FLO Posted December 11, 2005 Share Posted December 11, 2005 Hi Warthog, you make some interesting points...... I realized that I had a problem with my mirror, to wit: it was a spherical mirror, not a parabolic one. A spherical mirror isn't always an indicator of poor performance. The TAL-2 has a spherical mirror that produces excellent results and because spherical systems are far less subject to mis-alignment, it requires periodic alignment only. ... correspondent of mine brought along his Tasco 4.5". I had a look through it, and it was immediately obvious that the view was much better at high magnifications (>150x) So I bought it, and now use it almost exclusively. I have been able to see detail on Mars, and much detail on Jupiter. The Cassini division in the rings of Saturn still eludes me, but I can sometimes see surface markings on Saturn. This is curious? A 4.5" should easily be able to see the Cassini division in Saturns rings. At first, I wondered whether it was a contrast problem but, if you can see detail on Mars, in Jupiter's weather bands and the surface of Saturn .... I'm flummoxed :scratch:Steve Link to comment Share on other sites More sharing options...
tom.yates Posted December 11, 2005 Share Posted December 11, 2005 Hi Warthog, is it not just down to seeing conditions? when did you look at the planets was it on the same night sometimes i cant see the cassini either through a 5" APO THEN OTHER TIMES I SEE IT WITH EASE So i am wondering if that is the case the seeing can change very quickley Tom. Link to comment Share on other sites More sharing options...
OXO Posted December 11, 2005 Share Posted December 11, 2005 I would go with the seeing conditions i have seen these details ina Tasco 4.5" reflector and crud mirror.James Link to comment Share on other sites More sharing options...
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