76毫米 Maksutov 观测望远镜

76mm Maksutov Spotting Telescope

2024-01-13 21:06:26

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Summary

This is a small spotting scope based on the 76mm Maksutov lens/mirror combo available from The Surplus Shed:

https://www.surplusshed.com/pages/item/PL1298.html

NOTE: This is a hugely popular item. Once Fred gets a new shipment, they sell out the same day. I recommend that you go to the site and click "Notify Me" to get a heads up when they're back in stock.

The body of the scope is a length of 4" schedule 40 PVC tubing, 6-7/8 inches long. The project consists of the following 3D-printed parts:

Meniscus cell: Holds the front meniscus lens and secondary.
Meniscus retainer: Screws into the meniscus cell to hold the lens in place.
Objective plate: Mounting plate for the primary mirror. The hole in the mirror fits over a threaded baffle tube.
Mirror nut: Threads onto the baffle tube to hold the mirror in place.
Objective slide: Mount for the objective plate using three screws and springs, allowing for collimation of the primary mirror. The slide moves inside the tube to achieve focus.
Rear cover: Mounts to the rear of the optical tube. Receives the diagonal holder. Has three holes to access the collimation screws and one hole for the focusing screw.
Diagonal holder: Screws into the rear cover. Has two screws for retaining the diagonal.
Collimation cover (3 req'd): Plugs the collimation holes in the rear cover.
Focusing knob: Holds an M4 nut to engage the focusing screw.
Bezel: Mounts to the front of the optical tube. Threaded to receive the cover.
Cover: Threads into the bezel to protect the meniscus lens.
Strap top (2 req'd): Top half of the strap securing the scope to the dovetail bar.
Strap bottom (2 req'd): Bottom half of the strap.
Mounting bar: Vixen-style dovetail bar. Attaches to the strap bottoms.

Two other parts are needed to assemble and adjust the scope:

Drill guide: Used to locate the mounting holes for the rear cover.
Collimation tool: Sized for an M3 nut. Used to collimate the scope.

The following additional parts are required:

M4 X Xmm bolt and nut: Used to focus the scope by moving the primary mirror.
X X X spring: Moves the objective slide when focusing.
M3 X Xmm screws & nuts (3 req'd): Holds the primary mirror on springs, allowing for collimation.
X X X springs (3 req'd): Part of the collimation mechanism.