astromaster 70az eye peices

[IRT]

Hello IIS

I have a astromaster 70az- http://www.celestron.com/browse-shop/astronomy/telescopes/astromaster-70az-telescope


I would like to start using it again however when moving house I seem to have lost all the eye peices..... I had a 10x a 15x and moon filter.....

were is the best place to buy replacement ones? bear in mind I only paid $160 for the scope so Im hoping the eye pieces arn't too expensive.:thanx:

[BeanerSA]

Me again! Your best bet are going to be Plossl eyepieces that run at $30-$35.

http://www.ozscopes.com.au/skywatcher-super-plossl-eyepiece.html

[dannat]

also advertise a wanted ad here for either a 15mm 60x] or 20mm [45x] superview eyepiece, they have a larger fov..you should get one for the same price as the plossl's
something like a 7-8mm ep is what you'll want for planets

[IRT]

Thanks guys

so it looks like you don't know 'celestron' branded ones for it?
I am trying to load that website beaner but it says connection not found I think the site is down at the moment will try again later.....

yes i really want to see saturn and its rings... will this scope be able to do it I read up I need at least a 40x zoom to see the rings

[Atmos]

I get that a LOT on the OzScopes website. Try it again in 20 minutes and it may work.

[IRT]

how do I know what zoom the eyepeice has all it says is the mm ?

[BeanerSA]

No, they don't have to be Celestron branded eyepieces.



You calculate the magnification (zoom, to use your term) by dividing the focal length of the telescope, by the field stop (the mm number) of the eyepiece.

For your telescope, the focal length is 900mm. A 10mm eyepiece, for example would give you 90x magnification (900/10).

A 25mm eyepiece would give you 36x magnification.

Does all that make sense?

[IRT]

Yep it's starting to make sense now :eyepop:

So to see saturn would I go for a 10mm eyepeice or 15? I know that its not a azsomething mount so it wont turn with the earth so might be hard to 'follow' saturn at a high zoom with a standard mount is that right?

[BeanerSA]

As you correctly point out, a 10mm will give you higher magnification, but Saturn will move out of view quicker. A 15mm will show saturn slightly smaller but it will stay in your view longer (depending upon the FOV of the eyepiece). Which raises another point. Eyepieces come in varying Field Of View (FOV) types, from around 45degress up to 110 degrees. A Wide Angle (FOV) eyepiece will give you a bit more viewing time.

If I had to recommend an eyepiece that I think would be within your budget (based on our prior involvement), I would suggest http://www.ozscopes.com.au/skywatcher-9mm-1-25-super-wide-angle-eyepiece.html

You might see them referred to as 'gold line' eyepieces on other forums.