Quote:
Originally Posted by Merlin66
Ryan,
Usually a pinhole, as small as possible in aluminium foil is used.
I have a couple of the Hubble torches which work 200% - the accuracy of the pinhole is what's its all about.
The pinhole should be around x10 the focal length from the scope - for the C8 that would mean around 20m.
The image you show looks Ok BUT what's causing the secondary fainter image? I assume you only have one hole in the card?
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Thanks Ken, makes sense. The reason for the two holes was I just did a quick dodgy job and used a stapler. One of the holes I made larger with a pin so I could try the different brightness. Yup, foil would have made much more sense. But I checked out Saturn again last night and it looks like, for what it's worth... I have a working telescope.
I did have 3 holes and in the end (after the shown photo) I did block the other hole and only used one.
