plese help with canon eos rebel xti

[daisey]

Hi everyone, i finally received my t ring and adapter to start taking photos with my digital camera. I set up everything and then when it came time to taking some photos of the moon, there was no setting for me to change the apeture!! I have the camera set on AV and the screen only shows FOO, as soon as it take off the adapter poof i can change it to any F stop i want.
It does tell me to change from AF to MF on the display but I do not have that option on the t ring??

Does anyone know how to change the setting so i can start taking some photos, the only thing i can do is change the exposure time

Any help will appreciated.

I am using as mentioned the canon eos rebel xti
canon t ring
orion adapter

[turbo-1]

You are expecting your telescope to act like a camera lens that has aperture control, and it cannot do that. Your camera body cannot change the aperture of your telescope, nor can the body auto-focus the telescope. You need to change the body's setting to manual focus so you can focus the image. Then you must decide what ISO to shoot at and what shutter speed to use.

[daisey]

thanks, so bascially my XT8" is F5'9 that will not change, so now i adjust shutter speed and iso only and focus using the telescope and i should be fine

any suggestions for saturn, moon shots?

[Egregious Philbin]

Trade up to the XSi, the live view makes focusing very simple.

Just port out the live view to the laptop, find a star, blow it up 5X and focus.

Good all night.

I could never get a satisfactory focus with the XTi.

[skintigh]

Rather than spending $900 to get one new feature, you could spend $99 and buy one of those modified webcam things: you'll get far better results than with your DSLR. However, you'll probably also need a 2x or 3x barlow to get a close shot of planets, and maybe a reducer to get the whole moon at once...

Or you could do what I currently do: focus, take a shot, zoom way in to check the focus, repeat ad nauseum until you get nice, crisp focus. Or, what I do when I'm lazy is get the focus close and then take a shot, very slightly adjust the focus in one direction, take another, and do that 20 times and one is bound to be crisp :)

That live view thing does sound really cool. I would hope Canon will release a software update for the XTi, or maybe the hackers can add the feature. I've seen hacked firmwares that will add every software feature from the top end Canons to the XT. Of course, it wont change the hardware so maybe it wont work... One can dream.