Celestron CPC Vs CGEM

Celestron is one of the most popular brands of telescopes which is known for their good quality products as well as a wide range or price point. You can find lots of amazing models in the catalog and sizes to match with your preference such as Celestron CPC Vs CGEM that are very similar yet also slightly different. Functionality wise they are the same and equally reliable so let’s see what they can give you here in this comparison before deciding to choose one.

In this article, we are going to give you information about:

  • What to Look in a Telescope
  • What are Celestron CPC and CGEM
  • How are the Design of Celestron CPC and CGEM
  • How are the Scope of Celestron CPC and CGEM
  • How are the Mount of Celestron CPC and CGEM
  • How are the Performance of Celestron CPC and CGEM
  • Celestron CPC Vs CGEM

Choosing for a Telescope

While our eyes are already capable enough to see something in a distance as well as helping you to gather information and perceive something, they are still very limited in terms of the more advanced capabilities, since our body does not evolve to perform such tasks. Thankfully humans always try to find a way or solution to a problem and the answer is by using optics, the most prominent one is the invention of the telescope itself which lets you peek into something distant through an arranged glass/mirror.

Telescopes have been around since the 16th century and the main idea is still being used today while technology wise our modern telescopes are much more advanced. They are also often redesigned to counter the disadvantages of certain concepts or design which makes them even more reliable. For the options, they are getting more and more affordable as well but it all depends on what do you want to observe or do as well as what type of functionality they should have.

At the basic what most important in a telescope and anything that is meant to make anything further seems closer is the aperture or the diameter of the light gathering surface lens or glass. This part is very crucial because they are the one responsible for delivering the image and under perfect condition, the wider the surface, the brighter as well the image or better its capability in delivering your object since it can gather more light, especially the fainter and further one.

The focal length is another important factor in any scope and often described as the effective length of the telescope but it is more about the distance from the main optic to the point where the image is formed and different design can have different focal length which doesn’t always follow the length of the tube itself. Overall this factor is useful to consider the field of view of your scope since lower focal length means wider view but also lower magnification.

 Celestron CPCCelestron CGEM
Product Dimensions36 x 19 x 30 inches35 x 35 x 20 inches
Shipping Weight64 pounds105 pounds
Best offerCheck priceCheck price

For those who will be observing or taking a picture of a wide area, the shorter focal length will be more ideal since we can capture the whole image but if you want to see details such as the crater of the moon then longer focal point is the more ideal option. There is also a focal ratio such as f/10 which is important for those who are taking pictures since the lower this number means you can capture the image faster as well, considering the same quality scope and condition.

About Celestron CPC and CGEM

If you are here then it means you are also looking for a new telescope and while on the bright side the advances in technology bring more options into the market it also means we have tons of models to consider and this can be very time consuming to process. If you don’t have much time or don’t have a favorite brand yet, we do think it can be more convenient to go for the most popular brands or model since they may satisfy you as well.

Among those many options, Celestron is one of the most, if not the most popular options to consider. This brand is well-known and often the go-to when people are shopping for a new telescope whether it is for their observation hobby, photography, or as a present for their family and loved ones. This company carries tons of models and this is why almost any user can get their ideal option from the collection, including beginners who want an affordable yet easy to use telescope.

Due to the abundance of options, it can be confusing too, such as choosing between Celestron CPC and CGEM. Both of them are often found as a set of scope and the mounting system in which both are computerized so we do think they are more ideal for users with more knowledge or experience using the computerized mount. The model name actually refers to their whole system and the CGEM itself is sold individually to be paired with other tubes.

As an example today we are going to take the smaller 800 or the 8 inches size from both collection and for the CGEM, we will be using their EdgeHD scope which is one of the ideal options as well for astro imaging on budget; we have compared this scope in Celestron C8 Vs EdgeHD if you are interested. The EdgeHD is a line of the scope that has better design resulting in better image so they are also more expensive.

Celestron CPC and CGEM Design

As you can see on the sample picture above, Celestron CPC and CGEM models in these comparisons are offering the scope in SCT or Schmidt Cassegrain design which is why they are more compact. The most noticeable difference will be on their mount as you can distinguish that the CGEM is an equatorial mount while the CPC comes with an Altazimuth or alt az mount. Due to the difference in design alone you can expect the telescope will have different methods to track the object.

Moving into the tube, these SCTs are very similar to each other and with the 8 inches sample, the two are measured at 17 inches in length while the material of this tube itself seems like aluminum. The diameter is also the same at 9.37 inches and both will also come with their own tripod. In addition usually Celestron will give you at least one eyepiece in the box and these two are equally paired with a 40mm, 51x magnification eyepiece.

Celestron CPC and CGEM Scope

Now let’s see what Celestron CPC and CGEM can offer and since we are choosing the EdgeHD, let’s see the tube first because this design is improved from the standard SCT by the brand. The scope in this line is slightly redesigned by putting a special corrector inside the optical tube to create an aplanatic optical scheme that combines the advantage of CDK into SCT design. This is achieved by adding different mechanical improvements as well including the new internal baffles and new primary mirror that is supported by a locking knob to reduce mirror shift.

Celestron CPC and CGEM Mount

From the tube, let’s move into the mount which is the focus of this comparison. As the basics of Celestron CPC and CGEM are different in mount design, we do think it will be easy to choose one according to which of them will fit in your application the most. Usually for astrophotography the equatorial mount is more popular because of the nature of the movement that can track the sky by moving the payload around two axes.

As long as it is properly aligned, equatorial will be more ideal for photography as it nulls the field rotation thus, we can take long exposures for those who are into deep sky objects. The down side is it took more time to work with and the polar alignment must be as good as possible to let it work properly. With the CPC model and its alt az mount, you can simply swing the tube to left or right and up or down.

In theory the alt az will be simpler to use but for Celestron CPC and CGEM, both are equally computerized so we don’t have to do everything manually. There are several aligning methods in both systems such as two-star align and solar system align with the CGEM also has EQ North align and EQ South align; there is a hand control remote to access and navigate the system.

Celestron CPC and CGEM Performance 

Lastly for the performance, both Celestron CPC and CGEM are very similar in terms of ease of use. For those who are not familiar with the system it can be time consuming learning how to align these scopes. For example we use the two star alignment so we have to find the objects which are probably easier using the finderscope in CPC series. Since all movements are automatic following the remote, they are very convenient as well. In comparison somehow the CGEM is noisier when making big movements than the CPC alt az mount.

Celestron CPC Vs CGEM

These telescopes are amazing when it comes to convenience since they are computerized so as long as we have done the aligning, their mounts will do the rest of the tracking. The difference in mount type is what sets Celestron CPC and CGEM apart the most as one is an alt az and the latter is an equatorial. While for observation both are equally good, the former may need additional tools to eliminate field rotation and achieve true equatorial tracking.

- Item may ship in more than one box and may arrive separately
- 8 inch Schmidt Cassegrain telescope
- 2032 millimeter focal length
- Aluminum optical tube construction
- Celestron 8" aperture aplanatic Schmidt-Cassegrain telescope produces astrograph-quality flat focal plane
- EdgeHD coma-free Cassegrain optics and a built-in field flattener ensures sharp focus all the way to the edge of the field
- Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around the mount
- Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror


There is no bad option between these Celestron CPC and CGEM so you can go well with any of them. We recommend getting the CGEM for those who will be taking pictures but if this is meant for observation then any of the two can be a great choice.

Leave a Comment

Your email address will not be published. Required fields are marked *