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Everything posted by TheCounter
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The stars in the corners look much better. With the MPCC, I always had a "softening" effect on them (coma and blur in direction of the corners), thats gone with the GPU. Spacing is easy, I went with the recommendation of 53mm for my QHY294c. And I need around 35mm backfocus, so you'll need to wind it out a bit more compared to the MPCC. But as it's so long, tilting shouldn't be a problem. I did replace my focuser though, because the stock focuser was rubbish on my PDS. The new one is strong as hell, another league compaired to the SW focuser. But to really be sure there won't be any tilt, I designed and printed a anti-tilt and rotation adapter. Thats 4 pieces, 2 hold onto the focuser itself, the other one pushes down the GPU and the third is for displaying camera rotation:
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Yes I'm really happy with the GPU, its way better than the MPCC. Let alone the fact, it's just too long to tilt, so no problem with that. I'm not yet ready to post a in-depth review of it, as the weather is kinda "freaky" here in germany and it's not getting 100% dark thanks to summer. Should have it ready in a few weeks though. But if you want a good CC, go straight for the GPU. I would never ever go back to the MPCC. Btw. I'm really happy I bought a 3D printer. I always had to hook up my MiniPC (to control my whole setup, running on Windows 10) in a kind of strange way to my telescope. I now printed a case for it, that sits ontop of the telescope holding my guidescope Old: New:
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I didn't have any grub screws, so I had to use normal screws, but I'll switch them out later. Those are for holding the focuser on the base plate. If you loosen them, you can take off the focuser without loosening the base plate itself. I ordered a 3D printer aswell, this will save me a s*itload of money as I constantly need something new. First thing to print is a rotation gauge that fits between the GPU comacorrector and the focuser tube. With that it will be a hell of a lot easier to set the right rotation for the camera
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Finally, my custom Monorail base mount arrived. I designed this with a CAD program and a friend cut it out of a aluminum block. It fits even better than the original Skywatcher base! Can't wait to do some testing. On the image you can see the new base at the bottom, with the TS Monorail focuser on top. I also added a motorized focuser. Plugged inside the focuser tube is a TS Superflat GPU coma corrector with exactly 53mm spacing, a IR/UV cut filter and on the top is a "Visual Back T2 to 1.25"" adapter for using the collimation tools with the GPU installed.
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I'll post a detailed report as soon as it's getting clear again here. Spacing isnt a big deal thought. Not like with the MPCC.
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I'm outdoors testing the GPU right now and BOY, its soo much better than the MPCC. Stars are sharper and more round, especially in the far corners. I never thought it would make such a massive difference! Glad I switched my MPCC for it I'll post a subframe comparison within the next few days.
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All I can say is, that you can't use the GPU if you cut your focuser tube, as its too short to get into focus. Glad I have a replacement left, will try again the next few days. My new focuser should be ready to use next week.
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Here you go: https://www.teleskop-express.de/shop/product_info.php/language/en/info/p6706_TS-Optics-NEWTON-Koma-Korrektor-1-0x-GPU-Superflat-4-Element---2--Anschluss.html That's a recommendation from a few colleagues.
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I had the MPCC too, but I switched it for a GPU (TS Superflat GPU). First light is tonight. I'll report back as soon as I have some results. What I can say for sure, it fits so much better into the focuser tube, without any play or tilt. I always had issues with the MPCC not fitting correctly or tilting.
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Thank you. About the focuser, I actually know about these adjustment screws, but thats not the problem. The focuser tube does flex a bit from the weight of the camera.
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Hi everyone, I'm reading this topic since a few months and I finally decided to join the discussion I have had a 130PDS for a few months now and did most of the modifications that were discussed here. But I always had a tilt anywhere in my system, so I eventually found out that the focuser was causing it. So I bought a Monorail focuser from Teleskop-Service (here in germany), as they are pretty good for the money. Only problem is, there is no baseplate available to put it on the 130PDS. So in about 3 weeks I'll get a custom baseplate out of aluminum (that costs me about 130€) that I designed myself. If any of you want's to do the same, just tell me and I'll send you the CAD model / plans. As soon as I get it, I'll post some pics of it here. Anyway, apart from the tilt I'm quite happy with my 130PDS. I could take only 3 images with it for now, but I love them: All images are taken with a QHY294c at standard gain 1087. I used no bias, but flat-darks instead. More details can be found at my astrobin account: https://www.astrobin.com/users/TheCounter/ There is still much room for improvement Greetings from germany Kevin
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