Wide-T-Ring Nikon-Z with D52 to T-2i

This will not be possible, because the required backfocus between Nikon camera and lens is manufactured in such a way that a direct adaptation fits without additional adapter rings. With other rings or the UFC system, the required backfocus is no longer given. What would make sense for your desired setup is an adaptation of the UFC filter drawer in front of your Sigma lens, as in this example: https://assets.baader-planetarium.com/media/extendware/ewimageopt/media/inline/c5/e/baader-ufc-straylight-flange-549.jpg For this adaptation you need the following adapter rings to get from the 77mm Sigma filter thread to our UFC Filter Silder thread and finally to be able to adapt the filter drawer: - # 2958077 Baader Hyperion Stepper-Ring M62 onto M77 - # 2958062 Hyperion DT-Ring SP54/M62 - # 2459134 Baader UFC S70 / SP54 (m) Telescope-Adapter - # 2459110 Baader UFC Base (Filter Chamber) - # 2459114 Baader UFC 50x50 Filter slider - # 2459121 Baader UFC Straylight-Flange

We have created a Digiscoping Brochure which lists all required adapters for all cases of digiscoping, you should find answers to all your questions there: https://www.baader-planetarium.com/en/downloads/dl/file/id/444/product/0/digiscoping_camera_adaptations_for_afocal_photography_and_eyepiece_projection.pdf

You need DSLR (16mm flange focal length) Baader Wide-T-Ring Nikon Z (for Nikon Z bajonet) with D52i to T-2 and S52 (optical height: 8.3 mm) # 2408335 Baader S52 dovetail Camera-Adapter for Wide-T-rings (optical height: 2 mm) # 2459119 Baader UFC Base (Filter Chamber) telescope-sided S70 dovetail receptor (optical height: 13 mm) # 2459110 Baader UFC S70 / 2" SC-thread (f) Telescope-Adapter (optical height: 1 mm) # 2459128 to directly attach it to the telescope. This gives you a total length of 40,3mm. Optimum back focus for Celestron Schmidt Cassegrains is 5" or 127mm, so you may want 2x Baader UFC S70/15 Extension 40mm # 2459143 1x Baader UFC S70 Extension 5mm # 2459141 to achieve 125,3mm (126mm with a 2mm thick filter), which is close enough to the perfect distance. If you use a seperate focuser or an Off-Axis-Guider, you need less extensions. In that case, you may need another telescope adapter instead of #2459128, depending on the thread on the telescope side.

Please check out our digiscoping brochure with all our adapters, needed distances, recommended producs and so on, this should already be a big help: https://www.baader-planetarium.com/en/downloads/dl/file/id/444/product/0/digiscoping_camera_adaptations_for_afocal_photography_and_eyepiece_projection.pdf Unfortunately we can't guide you further on your specific telescope, since we don't sell SkyWatcher and are not familiar with this product.

You need the Nikon Z-adapter and the T-adapter which is included with your spotting scope (some Celestron spotting scopes have the T-thread already included in the eypiece, under the rubber eye cup. The Nikon Z with the T-ring has got a flange distance of ca. 24mm. The distance between camera sensor and eyepiece should be about 95mm for a full frame camera, otherwise there will be vignetting and distortions at the edge of the image. So, you should use T-2-extensions for an additional ca. 70mm, e.g. 1x Baader T-2 / 40 mm Extension Tube (T-2 part #25B) # 1508153 and 2x Baader T-2 / 15 mm Extension Tube (T-2 part #25A) # 1508154 We also recommend replacing one 15mm-extension with a quick changer (Baader TQC/TCR Heavy duty T-2 Quick Changing System (T-2 part #06A & #07) # 2456322 or Baader Complete T-2 Changer System (T-2 parts #06 & #07) # 2456321). Then you can rotate the camera easier as it is otherwise screwed onto the eyepiece, and you'd have to rotate the whole eyepiece to adapt the camera orientation. We have some examples in this PDF: https://www.baader-planetarium.com/de/downloads/dl/file/id/443/product/3117/digiskopie_kameradaptionen_f_r_afokale_fotografie_und_okularprojektion.pdf