Purchasing Help 

Who makes this stuff? 
What Size Tandem Bar?
If you are wondering what size bar you need, here is how to calculate it.
Desired bar length = R1 + R2 + C + 4"First measure the outside dia. of your OTAs. Divide the numbers in two to get the effective radius of each scope. Add to each radius any extra for rings or other attachments that would come between the two scopes. Add the radii together. Add the clearance space you want between scopes. Add 4". This is the distance from the center of the OTAs to the ends of the Tandem Bar when using my saddles. On each end of the bar, the center of the scope will be 2" from the end of the bar. The distance is similar with most setups. The AstroPhysics DOVE8 is about 1.75" instead of 2". When you have a total, select a bar that is equal to or longer than your total. 
12"  Tandem12  
14"  Tandem14  
16"  Tandem16  
18"  Tandem18 

Tandem12  6" & 5" refractors  5" refractor & 6" Russian MakCas, MakNewt, or standard Newtonian  6" refractor & 4" refractor 
Tandem14  Two 6" refractors  6" refractor & 6" Russian MakCas, MakNewt, or standard Newtonian  Mewlon 250 & 4" refractor 
Tandem16  C11 & 6" refractor, Mak, or Newt  Mewlon 250 & C8  C14 & 4" refractor 
Tandem18  C14 & 6" refractor  C14 & C8  C11 & C9.25 
Astro Accessories 

