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I am sick to death of banging my head against a brick wall regarding this
problem. Many new buyers will at some time decide to take some pictures
with their new scope, only to find out that they can't. WHY DO RETAILERS
NOT DO THE RIGHT THING AND INFORM BUYERS OF THIS ISSUE.
Skywatcher [and Saxon, same thing] Newts do allow prime focus imaging,
but most other brands don't, unless they are astrographic models.
The standard fitting on SW Newts, which doesn't require the purchase of any adaptors, other than the appropriate T-ring, works at 1.25." All bar one of the prime focus images I have posted over the years have been taken with this set up, and vignetting has not been a problem. The T-ring is flush with the outer end of the focuser.
I have found that very often the mirror needs to be moved up the tube a
lot more than 5mm Glen, necessitating much longer adjusting screws.
I feel so sorry for people in this situation, it is so frustrating.
Rant over.
raymo
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