2" BDS-SC Baader Diamond Steeltrack Focuser

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2" BDS-SC Baader Diamond Steeltrack Focuser

# 2957220

€ 325.00 Price excl. German VAT tax (19%): € 273.11

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  • Baader Diamond Steeltrack (BDS-SC) for Schmidt-Cassegrains (EdgeHD) with 30 mm focus travel
  • Minimum height (as supplied – incl. 2" clamp): 93 mm
  • Minimum height (with optional S58 direct-thread adapters): 80 mm
  • Focuser weight (as supplied – incl. 2" Klemme): 1.040 g (36.7 oz)
  • Includes 2" and 3.3" adapter to fit all C14/C11/C9¼/C8/C6/C5 OTA’s

Product Questions

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Please, where in this focuser should my f/6.3 Celestron focal reducer (CFR) go? Currently, my imaging train would be:
C11 --- (¿CFR?) --- BDS-SC --- (¿CRF?) --- ASI174

Question by: Martin on May 25, 2017 10:41:00 AM | 1 Answer(s)
Do you think that 2" BDS-SC Focuser can replace the Zero Image Shift Microfocuser on 10" LX-200-ACF (GPS + AutostarII / Dated 2009) from Meade ? Or can you propose another solution with fine-focus mechanism, even it is in manual mode ? Thank you very much for your answer.
Question by: Manuel on May 12, 2018 10:14:00 PM | 1 Answer(s)
Do you know if we can use the BDS-SC with the Celestron Edge HD focal reducer for Edge HD 8"?
Question by: Stefan Broquet on Mar 24, 2017 12:20:00 PM | 1 Answer(s)
Do you have adapters for Takahashi Mewlon or CN212?
Thanks in advance.
Question by: Eric on Sep 8, 2017 7:44:00 AM | 1 Answer(s)
I would like to know 1) if and how I can fit this focuser to my Skywatcher MAK127 (bought ~2 years ago) ; do I need some kind of adapter ? will the original focusing knob at the visual back of the MAK still be accessible ?
2) same question for Skywatcher MAK180
Thanks a lot !
Question by: Frank on Sep 3, 2017 3:25:00 PM | 1 Answer(s)


Baader SC Diamond Steeltrack on Celestron Mount
Application example of BDS-SC Diamond Steeltrack

General Specifications for all Baader Diamond Steeltrack® (BDS) focusers:

Drive system

  • 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

Baader Diamond Steeltrack Adapters
Multiple Adapters available for shortest possible connection to most cameras / eyepieces
Multiple  Telescope-Adapters
Mounting of BDS-Adapters on the example of BDS-NT Diamond Steeltrack

Clamping system

  • 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

Baader SC Diamond Steeltrack
BDS-SC: all views
Imaging / Eyepiece projection
Imaging / eyepiece projection on the example of BDS-RT Diamond Steeltrack

Focusing Drawtube:

  • 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

Additional Information

Manufacturer Baader Planetarium
SKU (#) 2957220
Weight (kg) 1.04
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
Reduction 1:10
Rotatable Yes
Finder base No
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
compatible telescopes Schmidt-Cassegrain
Focuser style Crayford
Focuser size 2 inch

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Patrick 88/03/2017 30/03/201708:56
  • Rating:
Baader Diamond Steeltrack BDS-SC
I bought the BDS-SC to use with my C9.25 HD and I tested it on several occasions. I have to say it's an absolute joy to focus with the BDS. It runs very smoothly and allows very fine adjustments. It is big difference to the built-in focuser. The BDS allowed me to re-focus much quicker e.g. when switching to a barlow lens. I find it very convenient that it can be turned without unscrewing anything.

The BDS is a very solid build and holds also long imaging trains firmly attached. Both 2" and 3.3" threads fit to the C9.25 HD with or without adapter that came with the telescope, respectively. There are minor imperfections on the inner threads assumingly from clamp attachment during electroplating.

All in all I am very happy with the BDS and I think it's well worth the price.
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