Almost all vintage refractor with 0.965in eyepieces have baffles positioned according to a cone of light ending in a focal point instead a focal area. When 1.25" eyepieces are used, even with a 0.965"-1'.25 adapter, we will not have the full eyepiece area (diameter=27mm) illuminated. Instead, original baffles will act as diaphragms resulting in a light cone of reduced diameter. The solution is to put new baffles or to adjust the position of the original ones in order to accept a light cone with grater diameter ending at the focal zone as a circle of 27mm. In this picture a 76.2mm FL=1250mm (f/16.4) OKKK refractor.
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