As you can see there is only 105mm back focus left. the BDS SC is at least 93mm long.
According to this circumstances there is unfortunately not enough back focus left to adapt
C11 --- (¿CFR?) --- BDS-SC --- (¿CRF?) --- ASI174
Unfortunately, we do not know which thread is used on the CN212.
Unforunately, we do not have a mounting plate with SC-thread, but you have two options:
1) Baader 2" Safety Kerf nosepiece with 2" filter thread # 2408156 equips the corrector with a 2"-nosepiece, so that you can use it like a 2" eyepiece.
2) 2"a / M48i Zero-length reducing piece (zero optical length) # 2454834
Diamond Steeltrack® M48 Adapter # 2957204
This option would be more sturdy and shorter, but the free aperture is a little bit smaller, so I wouldn't recommend it for very large sensor sizes.
it is much easier to rotate the camera with a 2" nose piece even up to full format camera with wide T-ring and S52 barrel #2958551
2) same question for Skywatcher MAK180
Thanks a lot !
The Sky-Watcher 180 *should* be equipped with a standard SC-thread (2), so you should be able to attach the BDS-SC without any problems - if the description I have found onlie (still) applies to your specific model; technical data can change over the years.
The Mak127 seems to have only a T-2-thread (and a clear aperture of 1,25"), so a 2"-focuser may be a bit over-sized. But you should be able to attach the focuser with the Baader Expansion Ring 2"a/T-2i with 1mm optical path length (T-2 part #28) #2958242. Please check the manual und Downloads for the dimensions the the steeltrack, to see if you get problems with the focussing knob of your telescope.
You can still use the main mirror focuser of your telescope when the SteelTrack is installed.
General Specifications for all Baader Diamond Steeltrack® (BDS) focusers:
- True diamonds form a micro-geared high precision drive system never accomplished before
- In comparison to conventional crayford or rack & pinion drives, this micro-geared movement has zero backlash, zero cogging, and zero flexure
- Diamond Steeltrack® 2" focusers lift a payload of 6kg (13 lbs) straight up, without slipping, without excessive bearing preload (bearing preload can be increased further if necessary)
- Bearing system utilizes unbreakable Instrument Grade Roller-Bearings instead of simpler Ball Bearings - handles higher loads with greater rigidity and accuracy. No Teflon-pads anywhere
- 1:10 Stainless Steel fine-focus mechanism, ready for attachment of the optional Diamond Steeldrive temperature-compensating motor drive system
- Detachable drive block assembly is reversible for right hand or left hand fine-focus operation and for attaching the Diamond Steeldrive motor block
- Shortest possible mechanical design achieves optimum balance between focuser height (backfocus) and rigidity requirements
- Zero shift locking knob to precisely stop any movement without affecting optical axis adjustment
- S58 Dovetail ring-clamp built into focusing tube for accepting optional T-2 / M48 / M68 and other S58 direct-thread adapters to enable direct thread connection of accessories and cameras without 2" clamp
- 2" eyepiece clamp with hardened bronze clamp ring (length of clamp: 12.5mm / ½") included as standard
- Optionally available 2" Baader Clicklock-clamp w. integrated S58 dovetail (added length: 16mm / 5/8")
- Two auxiliary threads (M60x1 and M55x0,75) cut into the RT & NT focusing-tube for attachment of dedicated field flatteners or focal reducers/correctors
- Each bearing individually adjustable for precise alignment of mechanical vs. optical axis
- Ultra-hard subzero coated bearing races – precision milled and much harder than anodizing or stainless steel
- Oversized 55mm inner clear diameter, to prevent vignetting, with anti-reflection knife-edge baffles
|Focuser Travel||30 mm|
|Payload Capacity (kg)||6 kg|
|Inner Diameter / Clear Aperture (mm)||55|
|Shortest overall height (standard)||93 mm|
|Shortest overall height (w. opt. adapters)||80 mm|
|Motorized||No, but can be upgraded|
|Special Features||True diamonds form a micro-geared high precision drive system|
|Included Accessories||Includes adapter to fit all C14/C11/C9¼/C8/C6/C5 OTA’s|
|Inner Connection (lens sided)||Thread, 2" (50,8mm), 3,3", UNC|
|Inner Connection (eyepiece/-camera-sided)||Thread, Clamp, Dovetail ring clamp, M55, S58, 2" (50,8mm)|
|Optional Accessories||Baader Steeldrive temperature compensating motor drive system|
|Focuser size||2 inch|