Guide camera resolution?

[Juri]

I'm thinking of setting up a guiding system on my EQ5, in true DIY fashion of course.

How much resolution is necessary for a guide camera? There are inexpensive webcams available from VGA to full HD res, how much is enough? Is more always better? (question hat-trick)

What else should I take into account besides resolution?

[stem1989]

I'm not sure about resolution I'm working pretty small at the moment it's more about the ability to adjust the exposure time for guiding as long as it has this capability I don't think resolution is a problem. Correct me I I'm wrong though people!

[JKB]

I'm using a cheap Tesco VGA webcam through a SW ST80. seems to work fine.

Cheers

Jamie

[Jessun]

The sensitivity is more important than pixel size, since programs like PHD guide on sub pixel level. The trick is to see stars in the first place. I used a few versions of MS lifecams with fairly good result on an ED80.

/Jesper