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Derek034 May 1, 2007 5:07 PM

Can anyone point out a good lens for my new Canon rebel XTI?

This is what I want to do with it, I want to be able to see the stars through it and to be able to take a good to exellent shot of the moon or what ever I point at.

Thank you.

Mark1616 May 1, 2007 7:06 PM

Sorry to say that it is not going to happen. I have a Sigma 120-300mm f2.8 (a $2700 lens I believe if I look at B&H - I'm in the UK so not 100% sure). I have added my 2x and 1.4x tele converters to this ($190 each) and popped outside a moment ago with my tripod and took a shot of the moon for you. This setup is giving me a focal length of 840mm (not a short length) and as you can see from the shot below the moon is still only filling a fraction of the frame (the diameter is approx 1100 pixels on my 30D so will be slightly more on the XTi) so it is not going to give anything like a good let alone excellent.

Now your $600 is going to get you a Sigma 135-400mm, you have to get nearly to $800 for the Sigma 170-500mm and the much stronger Tamron 200-500mm is nearly $900. All are much shorter than the above setup which was far too short for what you were hoping. The sort of length you want for good moon shots is going to be 2000 + mm and if you look at some fantastic moon shots by Romy Ocon such at this one you will see 4500mm on a 1.6x crop factor camera is getting close.

OK so where does this leave you? I think there might be some mileage in look at digiscoping but not 100% sure as I've never looked into this so poss post in the nature or nature technique sections. Moving onto the next stage, apart from moon and stars what do you really want to photograph with your long lens as we can then look at cheaper/more realisticoptions open to you.

Derek034 May 1, 2007 9:19 PM

Awsome moon photo btw. What about my 1000mm telescope? Can I get some kind of an adapter for this instead? and still use my rebel XTI?

Mark1616 May 2, 2007 4:04 AM

I'm not sure about what can be done but I would start a new thread in newbie help or general Q&A asking this specific question.

Derek034 May 2, 2007 6:00 AM

Ok thank you Mark. Camera should be here at 9am. about 2 hours from now.

Mark1616 May 2, 2007 6:04 AM

Very cool...... but what are you doing up so early!!!!

gryphonslair99 May 2, 2007 9:01 PM

Derek034 wrote:

Awsome moon photo btw. What about my 1000mm telescope? Can I get some kind of an adapter for this instead? and still use my rebel XTI?
That is going to depend alot on what diamater eyepieces you telescope uses. If it the older, smaller .95 inch eyepiece I doubt that you can find an adapeter to fit. If it the 1.25 inch then try here.

It will depend on the make of the telescope. You will need the T-ring for the body and the T-adapter for the scope. You may also want a piggyback adapter to help support the camera on the scope.

Derek034 May 4, 2007 3:15 AM

I'm a night owl. and I perfer to shoot at night.

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