Webcam questions

[alexl]

Got my self a philips 880 webcam, which has been flashed into a 900 (thanks for whoever wrote that post - made it simple!) and one of Wayne's adaptors. Just waiting for the high altitude cirrus to dissapear now before I can see anything and check it all works! Typical!

what sort of magnification would I expect to see with the webcam - i.e what size of eyepiece is it 'equivalent' to? And if I want to change the magnification optically (i.e not cropping the digital image) how do you do that? I'm guessing a barlow is the only way to do it?

[astroimpulse]

Check this out and you can enter your scope and camera (or switch to ep view) on any of the items in the list "Object Menu".

Should give you a fairish idea

http://www.12dstring.me.uk/fov.htm

[brantuk]

You can also download ccdcalc here:

The New CCD Astronomy Home Page

Put your own scope and camera details in to get what the chip will see

[alexl]

Wow - thats some serious magnification! how do I 'demagnify' it slightly? - I'd like to get the whole moon in the frame so it can be viewed on the laptop screen by the kids- I'm guessing some sort of 'inverse' barlow lens?