If you don't want to send us your scope, we would need precise measurements of the thread sizes / pitch as well as measurements or specs from your telescope to evaluate the backfocus. Please send images of all measuring steps.
I would like to have a clarification concerning the fixing of the BDS-RT (# 2957210).
Indeed, I have contradictory information. In the specifications, I see that the fixing is possible in 88mm dovetail but on this site:
72mm dovetail receiver permits 360-degree rotation of focuser with single-screw locking.
He's talking about a 72mm dovetail.
Can you clarify this point or offer me a fixing solution?
The Steeltrack doesn't come with a 77mm-dovetail, so I suppose that's just a typo on the website of Agena.
I would like to change the focuser with your steeltrack RT, is it possible? Wich kind of adapter is useful for?
telescop. As you can see under "related products" we have a M88x1 and M93x1 adapter availabe.
This is to go onto a 10" GSO RC telescope.
Also, what is the thread type on the back (the mount thread)?
your OTA. A drawing of this focuser you can see here:
At the time we don´t have an adapter to direct mount the focuser to M117. Please contact your dealer from where you bought the OTA to find an
adapter - so far I can see several adapter are already available at TS.
Usually this focuser will be used with cassegrain type telescopes:
a custom made adapter. A deatiled technical drawing of our BDS RT you can find here:
Please notice also if the inner tube of the BDS RT does not collide with the baffle from the refractor.
I can not find reduction ring for my scope. Thanks.
drawing with all neccessary data about:
don´t sell William Oprics. So far, our adapter rings to fit the focuser on different OTA´s you can find here:
1. the focuser would be heavier than the scope
2. there is not enough backfocus.
3. the included standard sliding focus is the ultimate help to save on backfocus and it works precisely if the centering screws are pretightened with care.
https://www.baader-planetarium.com/en/rt-adapter-m90x1-diamond-steeltrack-(skywatcher).html pitch is 1mm
RT-Adapter Ø 97mm Diamond Steeltrack® (Synta / Celestron) # 2957282
RT-Adapter M90x1 Diamond Steeltrack® (Skywatcher) # 2957283
RT-Adapter M90x1.5 Diamond Steeltrack® (Skywatcher) # 2957284
Unfortunately, we do not have the specifications of all telescopes available, and sometimes models change, so we'd have to ask you to take a look a the adaptiion of your current focuser. Usually, it is either connected with a couple of screws, or through a thread. Unfortunately, SkyWatcher uses two very similar questions. If the thread isn't specified in your telescope's manual, you can easily measure it - we have described here how to measure a thread: https://www.baader-planetarium.com/en/blog/clicklock-clamp-for-your-telescope/
We don´t know what type do you have. Maybe ask a dealer who is selling this telescope to find out out what thread is in use to connect the
focuser. So far there are so many different brands and types on the marked we cannot have all informations about. Unfortunately Explore Scientific
doesn´t offer those necessary data. A data sheet for the Steeltrack you can find here:
What do I need? I am very confused what focuser and how does it attach to the ota.
# 2957220 for Schidt-Cassegrains with 30mm travel. It has got 2" (50,8mm) and 3,3", UNC threads (the standard SC-threads).
The 2" BDS-RT Baader Diamond Steeltrack Focuser # 2957210 offers 80mm of focus travel and may be used if there is enough place inside of the telescope for the moving inner part of the telescope (if the baffle inside of the telescope isn't too small).
I couldn't information about the connecting thread of the telescope, maybe you'd have to ask someone to make an adapter to SC-thread for you.
Actually it is made for the BDS NT (Newton) and is 5mm thick. As you can see in the technical drawing the 88mm diameter
dovetail is 7mm high so the body will overhang the 2mm at the telescope side. Certainly it should be easy to fill this distance
to make it possible using the BDS RT onto the telescope. Anyway please see the drawings carefully that may be the inner
tube of the BDS don´t collide.
Thanks and regards
Now you´re able to screw the Diamond Steel track focuser onto your telescope.
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||80 mm|
|Payload Capacity (kg)||6 kg|
|Inner Diameter / Clear Aperture (mm)||55|
|Shortest overall height (standard)||78 mm|
|Shortest overall height (w. opt. adapters)||65 mm|
|Motorized||No, but can be upgraded|
|Special Features||True diamonds form a micro-geared high precision drive system|
|Included Accessories||Adapters available or under development to fit a wide variety of refractor telescopes|
|Inner Connection (lens sided)||Thread, M60|
|Outer Connection (lens sided)||Thread, Dovetail ring, M68 x 1, S88|
|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|