Merge pull request #56 from andre-stefanov/guide

Added improved guide scope files to Addons

Author: Fabian

Addons/Guide/CAD/oat_guide_scope.f3z

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+# Guide scope
+
+This is an improved version of the already great OpenAstroGuider which mounts to the new aluminium base. 
+
+## Whats new:
+
+- Added thread between front and mid part to simplify focusing and make it more precise
+- Lens hood holds the lens now (instead of friction only which was dependant on 3d printer tolerances and other factors)
+- Made new 20x20 extrusion holders which can be mounted without the need to disassembly the main camera mount
+- More precise guide camera sensor mounting improves polar alignment and guiding
+- Camera sensor mounted without screws now
+- Supporting many different camera modules as long as they have have same screw holes
+- Reduced overall required screws amount
+- multiple further small improvements
+
+## What you'll need:
+- Achromatic lens with 50mm diameter and 182,8 focal lenght
+- Camera sensor performing well in low light (e.g. AR0130 or IMX290). Monochrome sensor recommended.
+- 2 x M4x8 screws
+- 2 x M4 t-nuts
+- 4 x M3x12 screws
+- 2 x M3 hex nuts
+
+## Printing
+
+Printed at with 0.15 layer height and 4 perimeters. Dark filaments improve signal to noise ratio by preventing light from the side (e.g. laptop) to hit the sensor.