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Hi Guys, i'll just put my two bob's worth in here.
I use a Canon 5D with various lenses, ranging from F2.0 to F4.0 and i believe at F5.6 this will work as well, and it dose work very well, for me.
Although i do have a Canon angle finder, i only use this if the F Ratio is beyond F4.0-5.6.
This is what i do, and i'll show the example using my Canon 300mm F/4.0
Set the camera so that only the center red square activates when you press the remote button half way down, it will also beep, when focused.
Mount the camera as normal on the mount with lens, and remote connected, and manually move the mount.
Put the lens on auto focus, have the expo set on bulb, find a star close to where you intend to image, and center it on the red square, which will eluminate each time you press the shutter half way down, once you hear the beep, beep you are focused.
Now switch the lens back to manual, (most important, i forget sometimes too). and image away, works every time for me, and as it gets colder you can re-focus, just repeat the procedure.
You dont need a computer to focus, admittly it can be a little fiddly at times, but once you get the hang of it it comes natural.
Cheers leon
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