SM40 Double Stacking Question

[Hans Tucker]

Last year I purchased a Solarmax SM40 40mm Double Stack external etalon with T-Max Tuner (manufactured/shipped in November 2010). This is a SM40 external etalon with T-Max Tuner that came with a BF-15 Blocking Filter which was kept by the seller.

I am now interested in a Solarmax SM40 Scope that has come up for sale which the seller states is around the 2010 era.

Can I use the Solarmax SM40 40mm Double Stack external etalon with T-Max Tuner to double stack onto the Solarmax SM40 Scope or do the two etalon elements need to be match at the factory?

[Merlin66]

Hans,
They don't have to be factory matched.
I use a double stack of SM60 filters on the front of my ED80.
Tuning is a bit fiddly, but when you understand the principle, it works very well!