Info: CNC secondary mirror spiders from Artesky and Backyard Universe

For a conversion of a Skywatcher Quattro 200, we took the opportunity to order two different CNC-machined catching spiders:

 

1. The secondary mirror spider from Artesky: [not listed in the shop]
   
   The CNC secondary mirror spider from Backyard Universe: https://www.teleskop-spezialisten.de/shop/3D-Druck-Entwicklungen/3D-Druck-und-Fraes-Artikel-von-unseren-Partnern/Fangspiegelspinne-SW200-CNC-gefraest-von-Backyard-Universe::6228.html
   
   Both secondary mirror spiders appear to be of very high quality and are precisely manufactured. They are milled from solid material using CNC machines.
   
   The advantage over the original sheet metal secondary mirror spiders:
   
   The diffraction-induced spikes are razor-sharp and could even be used like a Bahtinov mask for focusing.
   
   Collimation lasts significantly longer, and collimation stability is significantly increased.
   
   Comparison of secondary mirror spiders:
   
   Artesky
   
   Backyard Universe
   
   Width of struts:
   
   1.6 mm
   
   1.8 mm
   
   Height of spider:
   
   15 mm
   
   18 mm
   
   Width of outer ring:
   
   9 mm
   
   7 mm
   
   Dullness:
   
   Coating appears brighter and reflects more in oblique light.
   
   Coating is darker and reflects significantly less in oblique light than Artesky.
   
   Installation instructions:
   
   Instructions seem overrated.
   
   A link to excellent instructions is provided via the enclosed QR code.
   
   Light reflection on the Artesky CNC spider:

Light reflection on the Backyard Universe CNC spider

 

Due to its better reflection properties, we decided to use the Backyard Universe CNC spider in our conversions.