Shop by Price
Shop by Brand

MoonLite NiteCrawler 2 Axis Worm Drive Rotating Focusers

MoonLite NiteCrawler 2 Axis Worm Drive Rotating Focusers
MoonLite NiteCrawler 2 Axis Worm Drive Rotating FocusersMoonLite NiteCrawler 2 Axis Worm Drive Rotating FocusersMoonLite NiteCrawler 2 Axis Worm Drive Rotating Focusers
MoonLite NiteCrawler 2 Axis Worm Drive Rotating FocusersMoonLite NiteCrawler 2 Axis Worm Drive Rotating FocusersMoonLite NiteCrawler 2 Axis Worm Drive Rotating Focusers
Price:  £2,300.00(Inc. 20% VAT)Earn 2,300 Loyalty Points

Model:  WR25
Brand:  Moonlite
Select Fit:  SCT

2 Year Warranty On All New Items
(Excluding Batteries & Globes)

Please note not all colours are kept in stock all the time. Colours available are: Red, Black, Gold, Blue, Violet, Green.  If you want a specific colour, please email or us prior to ordering to check stock. Any colour can be ordered and takes around 3 - 4 weeks. Custom flanges are also available. Please contact us for details.

MoonLite NiteCrawler 2 Axis Worm Drive Rotating Focusers (Model NiteCrawler)

MoonLite’s NiteCrawler models are a fully electronic focuser that uses fly by wire control technology for very accurate positioning in both focus and rotation. The patented design is intended for remote automation of large heavy imaging instruments providing extreme position accuracy that is repeatable down to .26 Microns. Vertical focus motion is handled by 3 Stainless Steel rails riding on 6 large 1/2" bearings under large pre load pressure. This allows the focuser to maintain center line mechanical point even with huge instrument loads hanging on it. Rotation is provided by an inner and out drawtube riding on a double row bearing track providing extreme rigidity. The drawtube is designed just like a tall bearing, but in this case is hollow. The Large stainless steel lead screws provide very accurate position and no backlash up to 25 lb instrument loads. The focuser holds heavy loads even with the power off and remembers position on power up, no need to re-home each time it is turned on.


The design of the NiteCrawler uses positioning technology currently in use in todays CNC machines. The NiteCrawler has a built in controller with display for positional information. It also provides manual Jog handles/ knobs on encoders for both focus and rotation input right at the focuser. The Jog rate of the input knobs can be selected on the controller allowing the user to pick the resolution of each click on the knob. Note the knobs have a 32 position indent feel, so each click of the knob will move the selected axis 1 unit or multiples of one unit depending on the jog rate picked.

ASCOM drivers and SKYX direct plug, or our MoonLite program can be used to operate the focuser remotely.


The NiteCrawler is offered in three format sizes:
WR25  2.5” format 
WR30  3.0” format  
WR35  3.5” format 



25 lb. instrument load capacity
2 axis no backlash lead screws
Rotating drawtube .001 degree resolution
WR25 374,920 steps per revolution
WR30 444,080 steps per revolution
WR35 505,960 steps per revolution
Approx. .9” travel, 94,580 steps per inch resolution
.0000105” per step or .2667 Microns per step
Large ½” high capacity bearings
3 point stainless steel linear rails
5 jog rates with 32 indent encoder knobs
Left knob rotation & Aux focuser/ Right knob focus
Eccentric cam bearing collimation system
Remote temperature probe
Auxiliary motor port can run 3 optional accessories:
Optional Mini Worm secondary focuser
Optional automated dust cover
Optional Focal reducer/ flattener elevator positioning system
Most flange sizes in stock. Custom available on request
6 custom anodized colors
Power 12 volt / 400mA (both motors running), 120mA (Idle)
Weight - WR25 6 lbs. WR30 7 lbs. WR35 8 lbs.
Flange extenders available for adjusting profile .7" thick and 1.7" thick sizes
Thread in adapters for all cameras /reducers available
Drawtube extender rings included .5” , 1”, 2” sizes
3.8” to 4.1" min profile, depends on lower flange picked

Auto Calibrate Mode - Hold down the right button while turning the power on.  Let go of the button once the display comes up. The focuser will rotate in a CW direction finding the rotate home position first. It will then rack the drawtube down to find vertical focus home positon. This can take from 1 to 10 mins.

Note the limit indicator will go from Blue to Red when any of the magnetic position sensors are detected.

Auto Calibrate needs to only be done once, as the focuser remains at and remembers its last position when turned back on. However, the focuser can be re-calibrated at any time, even remotely using the utility program.  This can be handy if cables get twisted or the focuser mechanical hits something to limit its motion. The motors are designed to simply stall if the focuser’s movement is restricted (runs in to the mount).

No harm will come to the drive systems, but a stall situation will require re-calibrating the focuser.


Inverted display mode is activated by holding down the Right side menu button for 3 seconds.  Hold down again to revert back to normal upright display mode.


The Aux port (if an option is connected) can be ran using the left jog knob. Hold down the left Menu button for 3 seconds.  The left jog knob will now operate the Aux port.  Notice the 1 X rate indicator turns on in the AUX display area and turns off in the rotation area. To switch back, just hold the button down for 3 seconds again to change back to rotation mode. Aux port Accessories are Mini Worm focuser, automated dust cover, and 3rd axis FR/ flattener internal elevator positioning system (for WR35 model only).


The NiteCrawler includes the Lower flange required to fit on the OTA it is ordered for. No need to source a 3rd party to machine a flange, we provide it free.
A universal 12 volt power supply with international plug styles is included along with a USB cable and a remote temp probe. Note if the remote temp probe is not plugged in to the controller, the focuser will use a internal temp sensor mounted on the circuit board, It is recommended to use the external remote probe for better accuracy.
One set of drawtube extender rings is included with all NiteCrawler focusers. We provide a .5" , 1", and 2" thick set to allow back focus adjustment. Please note specific thread in camera adapters are sold separately. Please see NiteCrawler adapters for your imaging needs. We make an adapter for all cameras plus reducers/ flatteners.


Sample thread in camera adapters shown on a WR25 format Nitecrawler.


Sample flange extenders shown installed on a WR25 format NiteCrawler. Flange extenders are sold separately.

Moonlite makes many lower flanges for all 3 Nitecrawler size focusers. Refractors, RCs, SCTs, Newts.
Please contact us for stock sizes. We can also order custom flanges by request if needed.

NiteCrawlers shown on refractors -- TOA130, FSQ106EDXIII, FSQ85, Esprit 150 

Moonlite Makes many reducer adapters for the NiteCrawler to allow reducers and Flatteners to be positioned down inside the drawtube saving back focus space. Please contact us for more details. 


Moonlite's NiteCrawler Non ASCOM application:

The NiteCrawler's profile is the same regardless of the size. Please note the total back focus used up by the focuser will be dependent on the lower flange picked


Mechanical Adjustments

Collimation is factory set on a bench with a laser, but customers can change it by adjusting the 6 offset cam bearing holders. Please see the Video for collimation procedures if you need to make this adjustment. It requires a 3/32" Allen wrench for the turning the offset cam bearing holder and a small 3/32" Allen wrench to back off the locking set screw. The locking set screw needs to be backed out before the Offset Cams position can be rotated. Note the bearing to linear slide rails are under a fair amount of pressure, so changing the offset Cam bearing position also effect the drawtube rigidness and collimation at the same time. We test with a  heavy leveraged load when collimating the focuser to be sure sufficient pressure exist between the bearings and the rails during the adjustment process. 

Focusers orientation can be adjusted once the focuser is threaded on the OTA. Adjust the focuser's position Then snug up the 4 locking setscrews with an 1/8" Allen wrench to lock the position in place.
Vertical lead screw backlash adjustment is a hidden setscrew located under the lower flange.  It is factory set but accessible if needed by removing the lower flange. A 3/32" Allen wrench is required. This adjustment is factory set and should not be adjusted unless service or a part is replaced in the focuser. The focuser is adjusted for Zero backlash on the vertical worm drive.

Be the first to Write a Review for this item!

Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or

The delivery times for most items is 1 - 2 days but again, please double check stock levels on important orders before placing an order via the website.

The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.

Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 1pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services. 

Please note International customers will need to contact us for a shipping price prior to ordering via the website. We don't ship all items internationally. It is at our discretion what we ship outside of the UK. This all depends on the size and weight of the items. Please get in touch with us for any postage costs. Please note we do NOT ship telescopes or heavy items outside of the UK. This is due to massive postage costs and problems regarding returns.

If you have any questions regarding stock levels or delivery, please get in touch.

Rother Valley Optics now have a loyalty point scheme active on the website. As you can see from the products, every item has a point value. Each pound you spend with us, you will receive 1 loyalty point. 1 point is worth 1p. You can accumulate these points as you shop with us, then when you are over £5, you can spend them on the website! Easy as that.

Even if you collect most of your items from our shop, you can still order via the website and select the "shop collection" delivery option. Then you can come to our shop, collect your item and still get your points!

Please note this scheme is online only. Customers who order via the telephone can still be added to the scheme manually. Please ask for more details on this. Before placing orders online, please make sure you are registered with us first otherwise your points won't be allocated.

So happy shopping and if you have any questions about the scheme or any other queries, please get in touch.

Rother Valley Optics


Finance is now available on most products above £250! We offer 12, 24, 36 and 48 months with a fixed 15.9% typical APR. Please note this can't be done through the website at this moment in time. You will need to email us or drop into the shop to sort out finance. As long as the item is above £250, finance is generally available!

Please note some items are NOT eligible for finance. Please contact us for eligibility first. 

Please get in touch with us today to find out if you're applicable.

You must be over 18 years to apply, live in the UK, have a valid UK bank account and not be bankrupt. Your credit file will be searched on application to see if you are eligible.

Rother Valley Optics Ltd is registered in England and Wales 04762707. Registered Office: 21 Station Road, Kiveton Park, Rotherham, S26 6QP. Rother Valley Optics Ltd acts as a credit broker only. Rother Valley Optics Ltd are authorised and regulated by the Financial Conducts Authority. Credit provided subject to age and status..

If you have any questions about this, simply give us a ring or drop into the shop for a chat.

- - - Rother Valley Optics Ltd

01909 774 369

Related Products
Moonlite High Resolution Stepper Motor Kit With Mini Controller V2

Moonlite High Resolution Stepper Motor Kit With Mini Controller V2£399.00


All MoonLite's High Resolution stepper motor options use a premium, low backlash Hurst stepper motor. This provides very fine .00008" resolution and accurate position repeatability required for today's high end imaging systems.