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mrrat
some links on this site are affiliate links which earn me a small commission. Contact Email: mrrat @ the domain name.
Astrophotography Targets - mrrat
Background Sky Surface Brightness rough equivalence to the Bortle Scale. Lower SB numbers are brighter, while lower Bortle numbers are darker. Bortle 9 = SB 17.5\u000BBortle 8 = SB 18\u000BBortle 7 = SB 18.5\u000BBortle 6 = SB 19\u000BBortle 5 = SB 20\u000BBortle 4 = SB 21\u000BBortle 3 = SB 22\u000BBortle 2 = SB 23\u000BBortle 1 = SB
ASIAIR Plus Review - mrrat
The equipment the ASIAIR Plus was tested with were a Losmandy GM811G Equatorial Mount, William Optics GT81 Telescope, ZWO ASI2600MC Cooled Color Camera, ZWO ASI120MM Mini Camera, ZWO 30mm Mini Guide Scope, ZWO EAF - Electronic Automatic Focuser, and ZWO EFW - Electronic Filter Wheel. Using both an Android phone and a sideloaded Chromebook. …
Star Tracker Gear - mrrat
Telescope Connection Breakdown - right to left Recommended back focus for RedCat is 55mm to the 54mm adapter Camera: threads 42mm female, space to sensor 6.5mm Spacer: threads 42mm male/female, width 11mm (comes on camera) Filter drawer: threads 42mm to 48mm female, width 21mm Spacer: threads 48mm
Deep Space Astrophotography Gear - mrrat
Telescope Connection Breakdown - right to left Recommended back focus to flattener for use with the GT81 telescope is 62.1mm Camera: threads 42mm female, width to sensor is 17.5mm Adapter: threads 42mm male to 54mm male, width 2mm Filter wheel: threads 54mm female on both sides, width
How To: Laser Alignment Guide - mrrat.com
CAUTION: never look directly into the laser as it may cause permanent eye damage. The adjustable laser can be purchased directly from MoveShootMove.com To adjust the laser you will need; adjustment wrench, laser mount, tripod, ruler, masking tape, and a fine tip marker.
How To: Make a Custom Stellarium Landscape - mrrat
Use your cell phone on tripod to shoot a level panorama. Just spin it slowly a full 360 with the camera in Panorama mode. Load into Photoshop and resize to 2048 wide.
AstroPhotography - mrrat
Standard Tracker Gear - getting started Advanced Tracker Gear - pushing the limits Star Tracker Targets - the short list
How To: Best Way to Make Flats - mrrat.com
I saw a recent video from Peter Zelinka where he had a piece of a t-shirt held in a ring. Brilliant. We just need something more uniform than a t-shirt. Embroidery Rings.This is the way to hold a stretched piece of fabric smoothly in place for use as a circular diffuser cover.
Advanced Tracker Gear - mrrat
5% off if you use the code: MrRat ZWO ASI2600MC-P Camera Not wanting to spend time fighting my photos I wanted a camera that was capable of usable one shot color images.