The long tube at the top is an assembly consisting of (from left to right) a 2" to T2 adapter, a Baader TZ-4 Tele-Centric 4x, a Meade variable projection unit (without 1.25" nosepiece or EP in it) acting as a variable T2 extension tube, the Solar Spectrum filter itself (the brass unit with the cooling fins at the top and a cable coming from it), and a Celestron 1.25" visual back. Below it on the left is the controller of the Solar Spectrum filter (temperature control), and below that is a power supply. The diagonal and EP are obvious, and to the lower right is the Beloptic Tri-band ERF in the cell made by Mark Townley.