Zuhmell Accessories

Zhumell, GSO, Astro-tech, Apertura 

Digital Setting Circles - Sky Commander with all hardware and computer mount

Rechargeable Batteries / Charger for Primary Cooling Fan

Secondary Dew Protection - Dew Guard

Field Covers

Sky Commander Digital Setting Circles

XP-4 Flash v 5.02

Sky Commander mounted on Zhumell Z-8

Sky Commander Computer with Zhumell Hardware Set

*  Allows the use of the friction adjustment on both axes

*  Installs with simple hand tools

*  Use with many planetarium programs (with optional planetarium cable)

*  User programmable up to 30,000 objects

*  Currently there are ten popular astronomical catalogs available for download with more to come

*  Convenient Mount Stalk is included!

The new Flash 4 Sky Commander transforms your telescope into an efficient observing tool.  Locate and identify objects within seconds, even in light polluted skies.  Spend valuable observing hours at the eyepiece instead of hunting objects. "Zero-in" the telescope to celestial objects.  Just move the scope until the "difference reading" of the object you selected is zero.  It's just that easy!  Identify unknown objects in a real time search and identify mode.  Any object within 0.5 degrees is identified and displayed instantly.  Other features include 32 character super twist LCD information display with backlight dimmer control, battery monitor, magnitude filter.  Best of all, the Flash 4 uses the simple, time tested two star alignment.  The Sky Commander has an extensive 16,000 object data base including NGC, Messier, UGC, IC, planets and 200 programmable objects.  Complete with computer, 10,000 step encoders, custom made cables and mounting hardware.

The Flash 4 Sky Commander is supplied with a computer interface cable, manual can be downloaded from www.skyeng.com/.


Catalog Size 16,000, upgradeable to 30,000+   Search Mode, Constellation Yes
Processor 8 bit 68HC11   Search Mode, Radius Yes, 0.5 degree
User Catalog Yes   Catalog by Name Yes, Double Stars
Display 32 character LCD, yellow Green   Planet Position Yes, better that 0.1 arc minute
Display Brightness Settings 3   Equatorial Platform Compatible Yes
Display RA/DEC or ALT/AZ   Platform Two Star Align Yes
Display Resolution 0.1 deg, upgradeable to 0.01 deg.   Polar EQ Mode Yes
Display Heater Yes   Realign on Object Yes
Sidereal Timer Yes   Serial Support Yes
Encoder Resolution 10,000, upgradeable to 32,767   ServoCat Support Yes
Encoder Test Mode Yes (in upgrade)   Sky Tracker Support Yes
Encoder Mode Display Yes, (via RS-232)   Weight 8 oz
Encoder Sample Rate 2000/sec. (moving) 1000/sec. stationary   Battery Monitor Yes
Search Mode, Magnitude Yes   Power 9V  gives ~40 hours operation


Complete Set Flash 4 computer, 10,000 encoders, cable set, serial interface cable, mounting hardware set 5 $549.00 8 lbs.
Flash 4 Computer Computer only $299.00 1 lb.
Encoders 10,000 step with low profile phone plug module $80.00 1/2 lb.
Computer Cable Planetarium Software Interface Cable 12' or 20' $15.00 1 lb.
Hardware Set 5 Zhumell, GSO, Astro-tech, Apertura  (included with complete set) $175.00 6 lbs.


View the installation instructions here


To Order: state telescope make and size.

You must send one of the altitude friction adjust knobs for modification, see photo above.

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The following astronomy programs (and others) for the PC, and some Mac, support communications with the Sky Commander:

"The Sky" www.bisque.com

"Megastar 5.0" www.willbell.com

"Guide 8.0" www.projectpluto.com

"Earth Centered Universe" www.nova-astro.com

"Sky Tools 2" www.skyhound.com

"Sky Map Pro 10" www.skymap.com

"Starry Night Pro" www.skyandtelescope.com

"AstroPlanner by iLanga Inc." www.ilangainc.com/astroplanner/

 Dew Guard

9V battery operation

AstroSystems amazing Dew Guard secondary mirror heating system automatically senses the air temperature and the mirror temperature, then maintains the secondary at a preset (adjustable) temperature above the ambient air temperature.  Gently warms the secondary at 2-4 watts when on full.  The DG-1 has 4 evenly spaced contact points for optimal thermal distribution.  Uses any external 9-15 volt dc supply or you can run on a 9v battery mounted at the holder, eliminating the need for wires across the spider.  Note: 9V rechargeable NiCd or NiMH batteries will not work, they are only 7.2-8.4V and have low capacity, rechargeable Lithium cells are 9V and will function properly.


Zhumell   Dew Guard 1 plus installation in your holder $59        ShipWeight 2 lbs.

Zhumell   Dew Guard 2 plus installation in your holder $59        ShipWeight 2 lbs.

Remote battery pack installation kit $19.00                                Shipweight 1 lb.

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Field Cover

Safely awaiting dark

Effectively cover your Scope at star parties and in storage.  This white, 400 denier, polyurethane coated nylon fabric will reflect the sun, resists dust and moisture and is long-lasting.  The cover allows positioning in the horizontal when not being used so that high winds won't knock them over.  It has a draw cord at the bottom to give a snug fit around the bottom of the rocker box.  A sturdy 1" nylon strap is provided to attach a weight to the top end, keeping the wind from standing the scope up or turning it into a cosmic weathervane.  The water and dust resistant polyurethane inner coating rounds out a complete protection package for extended observing sessions in the bush.  The cover exterior is sprayed with a water repellant to add further protection from the elements.  Worth every penny in strength, longevity and protection.  The AstroSystems cover is not intended for continuous outdoor exposure.  To retain the maximum water repellency, it is necessary to respray the cover once a year with silicone water repellant.  A 12 oz. aerosol can will coat a Z12 cover 4-5 times.


Zhumell  8"         Cover Size Z8        $47.00        ShipWeight 3 lbs.

Zhumell 10"       Cover Size Z10        $54.00        ShipWeight 4 lbs.

Zhumell 12"       Cover Size Z12        $54.00        ShipWeight 4 lbs.


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