Astronomy Specialist

M54 EXTENSION TUBE - 7mm

$39.00 AUD
SKU: AX-M54-EXT7

  • M54 x 0.75 Male
  • M54 x 0.75 Female
  • Optical thickness: 7 mm



This 7mm M54 extension tube features a male M54 x 0.75 thread on one end and a female M54 x 0.75 thread on the other.

This is a very useful accessory for making up the exact backfocus distance required by correctors.

 

Connection side A
Male M54 x 0.75
Connection side B Female M54 x 0.75
Optical length
7 mm
SKU AX-M54-EXT7

Customer Reviews

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G
Greg C
A Treasure Trove of Extensions

I had been operating with an Optec Gemini focuser/rotator on a commercial Schmidt-Cassegrain telescope. The limited range of focus of the Gemini focuser was not a problem as the SCT had a very wide range involving the movement of the primary mirror. However, when I moved to a Ritchey-Chretien scope, that wide range of focus was no longer available. I found that the adapters available from most dealers were either too long or two short and autofocus with my software failed. The problem was exacerbated when changing cameras. So, it was with a great sense of relief to find smaller extenders at Testar. I purchased both the 7 mm and 5 mm, giving me three possibilities for extending the length. Success!