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| The knowledgebase is organized into different categories; please select a category that you are interested in. You can also search the entire knowledgebase by entering keywords in the navigation bar beside this text. |
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 | How do I get a flashable hand control for my Celestron GOTO German equatorial mount? |  |
| You can obtain a replacement flash upgradeable hand control with SkyAlign technology for your Celestron GOTO German equatorial mount. Simply contact your dealer. Or go to Celestron.com |
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| My CGEM mount won’t let the front latitude screw lock the mount. What’s wrong – is the mount unstable? |  |
| If you are using the mount at 35 degrees latitude and the front latitude screw won’t lock, this is normal for the CGEM. Here’s why.The |
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| Does the stated payload weight of my Celestron mount include the counterweights? | |
| No. The payload weight does not include the counterweights.The payload weight is defined by Celestron’s engineering department |
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| Why am I getting “This mount does not support the PECTool” when using my CGE, CPC, CGEM and CGE Pro mounts? | |
| All of these mounts do indeed support PEC and Celestron’s PECTool.The reason you see this error message is because you are usin |
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| Why am I getting “Found Difference at Address 301: Value of 3589 should be 3590" when ugrading my CGEM motor control firmware? Is this serious? | |
| This kind of error message is called a verification error and occurs as the MCupdate program is checking the firmware upgrade. While in general it could mean |
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| My CGEM mount is moving in the wrong direction when I use the direction arrows. What is wrong? How can I change the direction of the direction buttons? | |
| You need to review and adjust the button direction logic in your hand control menu. The directions are made user-adjustable so you can match the direction the star moves in the eyepiece with the |
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| Where can I download the unified ASCOM drivers for Celestron? | |
| Please go to this web page on the ASCOM Initiatives website: |
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| How do I do a GOTO or alignment on the sun when it does not appear in the SOLAR SYSTEM list? | |
| Once you have your solar filter over the front of your scope, you can safely point it at the sun. However, as a safety feature, the sun does not appear in the hand control unless you enable it.Go |
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| Is there any way to run Celestron’s Window-based drivers and software on Macs? | |
| The drivers and software used with most Celestron products are (as of Fall 2009) not compatible with Mac operating systems.Though Celestron provides no support for these work |
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| My Celestron software won’t run on my Windows 7 computer. Help! | |
| If you have NexRemote, HCupdate, MCupdate,PECTool compatibility issues, simply download the latest versions from Celestron’s Manuals/Drivers page. |
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| What is the correct way to mount the 6x30 finderscope bracket on the CGEM 800 or CGEM 925? | |
| Mount the bracket for the 6x30 finder so the pylon or support is angled towards the front of the tube. This is pictured on the product page for the CGEM scopes. |
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| My autoguider port seems to have a problem. How do I check it? | |
| Issue a command to move your mount from your autoguider program or autoguider hand control (not to be confused with the scope’s NexStar hand control).The movement is very small, so you ne |
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| How do I balance my CGEM-mount optical tube assembly (OTA) in declination? | |
| To balance any OTA on a mount in declination, you need to slide the tube in the saddle rings or clamp perpendicular to the direction of the declination axis itself. |
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| I’m using an 11” Schmidt-Cassegrain tube (SCT) on my CGEM mount and the scope won’t balance in RA. What can be done about this? | |
| An 11” SCT (or similarly heavy tube) with accessories may be at or beyond the limit of the stock mount’s counterweighing ability. |
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| Can I change the position of my CGEM equatorial head on the tripod? | |
| Yes you can. You might want to do this to more conveniently position the legs of the tripod with respect to the counterweight or the counterweight with respect to other equipment you are usin |
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| I’m using my mount with an autoguider and getting mixed results. What are the best settings to use with Celestron mounts? | |
| There are no official settings to use with Celestron mounts that support autoguiders (these scopes have ports that will directly interface with any of the SBIG (Santa Barbara Instrument Group) type autoguide |
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| What are the payload weights of Celestron mounts? | |
| The payload weight is defined by Celestron’s engineering/product development department as the load that is carried by the mount’s dovetail clamp.These are the payloa |
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| Can all named stars listed in the hand control be used for alignment? | |
| No. Only stars brighther than or equal to magnitude 2.5 (bright stars) can be used for alignments with Celestron’s NexStar computerized mounts.Even though there are about 250 |
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| How do I use a third party periodic error correction (PEC) program like PEMPro with my Celestron mount? | |
| PEC data is stored on the motor boards in the GPS, CPC, CPC Deluxe, CGE, CGEM, CGEM DX and CGE Pro mounts in order to improve their drive accuracy. Using functions in the ha |
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| How do I use the polar axis finderscope for the CGEM mount? | |
| The polar axis finderscope accessory is an aid for quickly polar-aligning your telescope accurately enough for visual work. It’s also great to speed up a polar alignment using the functionality of the& |
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| I want to permanently pier-mount my CGEM. What size is the hole on the head holding the central rod? | |
| The CGEM’s equatorial head has a center flange 29.5mm in diameter. It is centrally bored out with a threaded hole that is M12x1.75. The entrance to the hole is smoot |
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| When should I use the CALIBRATE MOUNT utility? What does it do? | |
| For Celestron’s German equatorial GOTO mounts, this feature is found in the menu under UTILITIES. There are two functions in the CALIBRATE MOUNT submenu. Depend |
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| What dovetail bars are used with various Celestron mounts? | |
| The most common dovetail bar size in the telescope market is the Vixen-style bar, which is 1-3/4” wide. This is the size used with the dovetail clamp on the Advanced GT (CG-5) mount. It is also used with the LCM, SLT, SE |
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| How do you stop a GOTO slew in progress? Is there a better way than turning off power or pulling the power plug? | |
| Interrupt the mount’s GOTO slew by pressing any arrow key. The mount will halt the GOTO in progress.Since this is a regular h |
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| How do I set RA limits for my CGEM or CGEM DX Mount? | |
| RA limits restrict the slewing and tracking movements of your mount to the east and west to prevent it from running into itself, the tube running into the mount or attached equip |
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| What problems are possible when using a dovetail-equipped telescope tube designed for one mount when it’s used with another mount? | |
| The dovetail bar (sometimes called a rail) is one of the great ideas in small telescope design. With the clamp on the mount and a bar on the tube, telescopes (OTAs) and mounts ca |
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| What’s a quick summary of how to do All-Star polar alignment with CGEM – CGEM DX, CGE, CGE Pro and Advanced GT Series mounts? | |
| Here is a quick summary of All-Star polar alignment. It is basically the same for all the mounts. Some details differ: for example, the CGE and CGE Pro will not have index marks |
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| What is the threading on the outside of my Celestron GOTO mount’s power jack? | |
| Many of Celestron’s GOTO mounts use the same power jack. These jacks are threaded on the outside. The threading is M8 x0.75.On the CGEM, CGEM DX and the CGE Pro, power |
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| My Celestron mount is making a high pitched whine or hum even when it’s not moving. Is this a problem? | |
| No, it’s not a problem. This noise is perfectly normal and does not adversely affect the performance of your mount.The audible noise originates from Celestron’s new i |
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| Can I control my Celestron GOTO mount with programs like Maxim DL? | |
| Yes you can.Such programs connect to the mount via ASCOM (AStronomy Common Object Model). ASCOM provides a standard interface for a range of astronomy equipment inclu |
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| What it is magnitude and meaning of the cone error readings given by Celestron German equatorial mounts? | |
| In the hand control menu under Scope Setup, Mount Settings, your Celestron GOTO German equatorial mount displays Cone Value, which is set when one or more calibration stars are a |
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| I’m experiencing motion in RA east after slews with my Celestron German GOTO mount. Is this backlash and how do I correct it? | |
| Yes, it is classic gear backlash.Gear backlash will often show up on the RA axis at rates above rate 2 when moving east. Worm gears will often show backlash of about |
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| My equatorial GOTO mount seems to need a factory reset every now and the even though it otherwise works fine. Why is this? | |
| Your mount may normally perform just fine. Then while you are doing a two star alignment with calibration stars, the mount is way off when performing a goto to one of the c |
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| Will the 94224 Polar Finder work with the CGEM and the CGEM DX mounts? | |
| Yes. These two mounts have the same threading inside the polar axis housing as Celestron's CG-5 and Advanced GT mounts. The 94224 was designed for the CG-5 and Advanced GT |
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| Can the CGEM DX - CGE Pro tripod be folded with the accessory tray attached? | |
| No. Even though it may seem you can fold the tripod by partially removing the tray down the center rod, it actually needs to be completely rem |
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| How do I replace the real-time clock (RTC) battery in my CGEM/CGEM DX mount? | |
| Replacing this RTC battery is a straightforward process. You will need a standard Phillips screwdriver plus a small cup to hold the screws. |
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| My CGEM – CGEM DX mount is missing the polar axis index sticker. How do I position a replacement sticker? | |
| In order to mount the sticker, place the equatorial head in the equatorial (EQ) north position. This is the position (approximately) depicted on the front of the CGEM series manu |
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