| In selecting
a tube for the 127mm f/9.4 BGRP refractor,
there was little doubt as to the company I was going to purchase it
from. I went with Hasting Pipe Company located in Hastings, NE, who
actually has a small division that caters to ATM'ers. In knowing that the
focal length of the objective is approximately 47.5", I chose to get a
48" length of 5" O.D. tubing, with a wall thickness of .073". It
cost me around $50.00. To make the tube
work, all I have to do is cut it to the proper length (this will
be covered later in the overview). Also, by purchasing a tube with an
outside diameter of 127mm (5"), it fits the objective cell nearly
perfectly, except that I will have to sand the interior of the cell a
bit to increase the opening for an easier fit.
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