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Bob,
A cheap & cheerful method :
Set the focus of the scope to its minimum value, then cover the objective lens with a piece of aluminium foil, and poke a small hole in the foil.
Start with a very small diameter hole, then work upwards - it is a compromise between a brighter image and maximum depth of focus - just like any aperture.
The hole in the foil does not need to be in the centre of the field.
This technique of using a sub-aperture mask has been used quite a lot with astronomical telescopes.
Have fun & a good weekend
Best regards
Russ
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