elpajare
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Post by elpajare on Sept 14, 2017 15:16:10 GMT
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Post by davy on Sept 14, 2017 17:02:46 GMT
Nice one mate, it's a camera I had been looking at myself,,, looking forward to more testing on this camera by you 😀
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Post by howie1 on Sept 14, 2017 23:03:01 GMT
Interesting ... just a built in cooling fan. I've seen the usual peltier cooler fitted but not a fan. Good results though. Crazy how far EAA has come in just 5 years. Cheap, but good, RT cams in one of those cheap but full star-sense auto-align goto skyprodigy mounts and better results than very expensive kit 5 years ago. No affiliation with any mob selling them, but I do hanker to throw the cash down one day and try out one of those skyprodigy's ... f/5 newt so nice match to the RT cams for EAA. www.celestron.com/products/skyprodigy-130-computerized-telescope
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Deleted
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Post by Deleted on Sept 15, 2017 6:24:59 GMT
That's the one I use.
Identical to the GStar Ex3 and Altair 178 as far as I can see.
I paid a bit more than that....
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elpajare
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Post by elpajare on Sept 15, 2017 6:55:17 GMT
This is another picture of an easy object. Color and detail is pretty good. Taken with an Skywatcher 200/800 and a 5x30" shot. Gain at max. Final picture with Levels, Contrast and Curves post processing with GIMP In my opinion, this object is at limit of capabilities of this chip.
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Sept 15, 2017 10:33:19 GMT
Another classical to test camera, a nice cluster like NGC 869 Only 4 seconds expo. at max. gain with the Bresser AR-102. Sharp stars and nice color that makes a sense of depth pretty good.
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Post by Dragon Man on Sept 15, 2017 10:59:52 GMT
ooooooo, that one's very nice!
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Sept 15, 2017 15:12:37 GMT
Here I'm starting to see some of the limitations of this chip. Magnitude 12 is too weak for the IMX178 and IMX224 performs little better. 10x20" stack with SKW 200/800 and IMX178 10x15" stack with Skywatcher 200/800and IMX224
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Post by davy on Sept 15, 2017 18:20:56 GMT
Fair bit of a difference
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Post by ChrisV on Sept 16, 2017 1:08:27 GMT
Yes the 224 is stronger with those galaxies, but I like ngc869
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Post by Deleted on Sept 16, 2017 1:27:16 GMT
That is very interesting Carlos. Hiten on CN has said that a larger pixel size in the CMOS cameras is not as important for sensitivity as it was for the CCD's basically because of the very high SNR of the CMOS. So,the 2.4 micron pixel of the 178 should have similar sensitivity to the 3.75 micron 224 particularly with stacking and binning. I think your results show there is still a significant difference. www.cloudynights.com/topic/589731-cmos-sensors-for-eaa/page-3#entry8080347I bought the RT178 back in March but have to admit I havent given it a good go as yet. On the rare occasion when we get a clear night and I dont have a cold and it is not minus 2 degrees etc, etc, whinge, whinge,I have been trying to get the RT1600 under control. The 8.9 mm 178 sensor is a lot easier to deal with than that big momma in the 1600. For a start I can use it on an SCT with FR. Cant do that with the 1600. But I am ready to go with the SW 12" Dob next clear night . Determined to produce a decent image with the 1600 in alt/az sometime this year Paul
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elpajare
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Post by elpajare on Sept 16, 2017 7:33:58 GMT
Yes the 224 is stronger with those galaxies, but I like ngc869 Yes, me too. This chip is outstanding for shooting stars and objects lowest of mag.10-11. Sharpness and color are very good in my opinion. .......And keep in mind that my refractor is cheap
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elpajare
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Posts: 438
home town/country: Girona-Spain
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Post by elpajare on Sept 16, 2017 7:40:12 GMT
That is very interesting Carlos. Hiten on CN has said that a larger pixel size in the CMOS cameras is not as important for sensitivity as it was for the CCD's basically because of the very high SNR of the CMOS. So,the 2.4 micron pixel of the 178 should have similar sensitivity to the 3.75 micron 224 particularly with stacking and binning. I think your results show there is still a significant difference. I'm not a specialist in chips or electronics, I can only compare practical results. No theory is true until it can be proved by facts, my father told me.
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elpajare
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Post by elpajare on Sept 17, 2017 10:02:57 GMT
Another pair of shots to compare. Both with the Skywatcher 200/800 5x30" stack with IMX178. Note the color noise of the background 10x15" stack with IMX224
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Post by ChrisV on Sept 18, 2017 0:05:31 GMT
I suppose it's all about SNR. What happens with those two images if you adjust then so that you have the same background level in both.
Edit. I know this is a video astro sit and we don't normally post-process. But just to see what it looks like
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elpajare
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home town/country: Girona-Spain
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Post by elpajare on Sept 18, 2017 6:44:39 GMT
Im not so sure, both images have the background adjusted with GIMP. Differences are real. The IMX178 has background color noise with expo higher then 20" aprox. I must to try and apply Dark Field correction next night. This is an example with the defect exaggerated with Curves in Gimp, when you zoom at it is very evident.
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