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FWIW, I’ve been trying out the Baader M68 15-18 variable extension. Whilst the concept is good I find that unlocking the “locking” ring results in the whole unit unscrewing from what ever it is screwed into, particularly once it has been secured in the image train. I was hoping that it would allow me to make small adjustments to the back spacing without having to disassemble the image train but it doesn’t appear that this will be practical. For now I have gone back to a combination of extension tubes and thin spacers.
Last edited by Ryderscope; 27-02-2024 at 10:04 AM.
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