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Celestron CPC925: the Cassegrain Telescope

Celestron CPC925: the Cassegrain Telescope
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Last Updated: 07 August 2019

Today I’m unboxing a Celestron CPC 925 (Telescope), which is a big scope. Now, Celestron CPC 925 is a Schmidt Cassegrain, which means naturally it has some severe focal length. It’s a magnification machine. The Celestron has the standard Celestron StarBright XLT coatings on it, which means that you get a bright view through the lenses and it has lots of excellent transmissions. Now, a scope like this is particularly suitable for planets.

Comparing The Range Of Telescopes

And it’s suitable for bright small nebulas as well, but only the brightest ones and obviously star clusters as well. But again, in small ones the magnification means that you can’t get the whole of the field into the telescope. Therefore, it’s not going to look any good if you try to get a large one. It’s got a dual fork alt-azimuth mount. Dual fork means that it’s good and stable. It’s robust. It’s not going to move around a lot as it’s cumbersome. Looking down on the Celestron range, we’ve got the Evolution 925. Now, Evolution 925 is a single fork amount which makes it less stable.

The Evolution range has the built-in Wi-Fi and the built-in battery, which this guy doesn’t have, so you have to buy them separately. In terms of size, lower in the Celestron range, there’s the CPC 800, which is precisely the same guy as this only a fraction smaller. It’s the same f ratio, which means that the focal rate of the focal length is a little bit less, which means that the focal ratio is the same. Also up in the range is the CPC 1100. That’s like a CPC 800 only on the other side, its a very, very similar set-up: same focal ratio, slightly longer focal length, everything else is very similar.

Let’s Go To The Unboxing Part

I have the tripod here. It’s a little bit dusty out of the box. There are a few bits of polystyrene on it, but it’s quite functional. I’ll just put that to one side, and we’ll get into the… another one.

Okay, I have the OTA (tube box) box in front of me. Okay, after much pulling and pushing, I’ve got to the inner box. Inside I found a whole pile of information. Important note: don’t look at the sun. Okay, here we have the accessories. The first thing we have is a Celestron NexStar hand controller, which is the way you communicate with the telescope. I won’t throw this away. We have a visual back and an eyepiece. That’s a 40mm eyepiece. There’s a star diagonal 1.25-inch, and quite a large 9 by 50 Celestron finderscope. There’s a holder for the hand box (NexStar hand controller), which enables you to hang it on the edge of the tripod.

There is also the bracket that enables the finderscope to go onto the actual tube. And here I also have the central part of the show, and it’s enormous. The first thing you can tell from this is this is no small telescope. It’s big, and it’s heavy. What we have to do is get it on the mount, there’s a little nut there that goes locks up with a hole at the bottom of the scope. Then you rotate it until you hear some clicks because there are three little recesses here. Next, you need to undo two of those knobs. Hopefully, they’re not too tight. Just make sure that they bite and then you can come back later and tighten them up properly.

Ports

Just give it a bit of a jiggle as you tighten them. Jiggle again just to take up that slack. Finally, behold the Celestron CPC 925! After everything is all set up on the tripod and you go through the bits and pieces, let’s talk about the ports that you’ve got there on the tripod. First of all, you’ve got a hand control. You’ve got two auxiliary mounts, auxiliary ports. There’s a convenient Wi-Fi adapter or dongle that you can put into here. It enables you to use your phone or tablet to control the mount which means you don’t have to touch it while it’s moving, which can be very useful for a focal length as big as this.

There’s a PC port you can attach your PC to do this and use the NexRemote software to again control the mount, and there’s an auto guide port. Now, the auto guider is for astrophotographers who want to take very long exposures. The tipping point of these go-to mounts is that it will track the stars beautifully, but if you want perfection, you need an auto guider. This is a second camera telescope with a little camera, and it just goes and plugs in there.

Clearly, the on/off switch and the power cord goes there. You’ve got a power tank sitting on the ground that you can take to your car. It’s got a cigarette lighter attachment, or if you’ve got a power tank as we have you can use that, or you can get a wall adapter. Alright, now moving to the bits and pieces that go onto the tube. We have, first of all, a little cradle there which fits just lovely and that is the holder for the hand box. The hand controller goes in there. It just sits quite conveniently there the next thing is the mounting bracket for the finderscope.

The Finderscope

The finderscope has its own adjustment bracket which clips on there, and this is the finderscope itself. It’s quite a large finderscope. It’s a 9 by 50, and you will need a screwdriver to mount it. Now, there’s a black ring, and the black ring sits in the front of the little jigger here, and that will go on to it. It’s actually easy to put a small black ring down the front. Then, withdraw the two adjustment rings screws as far as you can. The one you can see is on a spring, and it’s a little bit hard to mount.

That’s a bit of an aggressive spring. If you withdraw these two, you get enough room to get the finderscope down there. It goes from the front feed through to the back. Eventually, the little black ring will just go into there you just push it a little bit further and with any luck be able to get it far enough in. Then you get these rings lined up. There’s a little groove in there, it goes up onto the CPC like that and screws down with the bolts nice and square. The power cable is here with me.

Cable & Conclusion

Don’t think I need to explain power cables too much. Now, I’ll need a knife. The visual back is the mount for a lot of your optical stuff. The visual back just goes right on the end of the telescope tube. I don’t know what they call it a visual back. Now, on top of the visual back or next along the train is the star diagonal 1.25 inch. This is a 1.25 inch visual back That will just go in there. And, finally, in the visual train, we have an eyepiece. That’s it!

I really hope you found something useful here.

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