[Shiraz (Ray)]

the chip is actually a fairly big one as chips go.

as you slide the camera around you will get images from different parts of the focal plane produced by the mirror. Only the central bit is really good and you want to firmly fix your camera so that bit stays on your chip. When you collimate your scope you are positioning the primary mirror so that it puts the best bit of the image plane on the centre of the chip.

One of the reasons for using a scope is that it will give you high magnification so you can see fine detail (it also captures lots of light). Forget about focal reducers and image stitching for now - your combination will provide a good field of view for years worth of imaging.

You will probably not get any useful results on stars by holding the camera against the focuser - they are hard to focus on without a very steady setup and you will need to use exposure times of seconds rather than 1/250. Could try it on the moon though - you might be lucky and get a wobble free image and you can also measure the actual height of the focal plane. You should see the whole of the moon.

then you need to wait until you get a better focuser and a camera adapter before you can try serious imaging. Therin lies a whole new set of challenges.