Tripod adapter flanges

The C8 EdgeHD has got 133mm backfocus from the SC-thread, the Atik 13mm from the T-2-thread, so we have 120 cm backfocus.

You need:
2459128 - 2" UNF-adapter (2" SC-thread) - 1mm length
2459110 - UFC Filter Changer Base - 13mm length
2459115 - T2-adapter - 2mm length

Which gives a remaining backfocus of 104mm. You can use either the UFC-extensions (larger, and bring the filter closer to the camera):
2x 2459143 - 40mm UFC-extension (=80mm)
1x 2459141 - 5mm UFC-extension (=5mm)
1x 2459145 - VariLock, set to 19mm

Or you use a combination ot T-2-extensions, which would be cheaper, but increase the distance to the camera, e.g.
2x Baader T-2 / 40 mm Extension Tube (T-2 part #25B) # 1508153 (=80mm)
1x Baader VariLock 29, lockable T-2 ExtensionTube 20-29mm (T-2 part #25Y) # 2956929 set to 24mm

In addition, you need filter slider; for mounted 2"-filters
Baader UFC 2" (M48) Filter Slider # 2459112

With the VariLock, you can also take in account the focus shift introduced by the filter; add 1/3 of the filter thickness to the length of the setup (e.g. 0.66mm for a 2mm thick filter)

If the ClickLock is fully opened (by rotating the larger ring counterclockwise), the Hyperion Zoom Barlow should fit into the Clicklock easily.
If you look into the Clicklock clamp, you will see too clamping bars - they should vanish completely into the housing when the Clicklock is open. You may have to give them a small push once.
But you should be able to insert the Barlow or any 1.25" eyepiece at least a little bit into the Clicklock.
For further advice, we need some more information - can insert it only a little bit into the Clicklock or not at all?

WARNING! This filter is only for Deep Sky imaging! Experiments on the sun are not recommended, this would be dangerous for your your eye! A proper Halpha solar filter for taking photos of prominences and filaments needs to be below 1nm (around 0,8-0,3nm).The 35nm filter is much too open for this and way too bright. Adding an Astrosolar film in front of the telescope will reduce all wavelength, Halpha too, so that you don´t see anything.

The inner clear diameter of this item is 61,5mm so it should work. More technical data is to find under the link <specification> at the website.

For Planewave Telescopes we suggest our M68/Securefit Adapter #1323840, which can be mounted directly to Hedrick/IR90 Focusers OR to the Securefit extensions.

Then you can use our M68 Clicklock #2956268. Make sure you have enough backfocus after the ClickLock. Old 17" and current 20" do not allow for the ClickLock and 2" Diagonal. You wont reach focus.
If you need NO 2" Diagonal you may need M68 Extensions. In this case we suggest our M68 Adapterset for Planewave which includes various Extensions and the Planewave Adapter.