Hi, i have a Coronado PST double stacked and i use the camera Meade LPI-G monochrome
I was thinking about buy another planetary camera, but i have this questions?
1) my images will improve over my lpi-g camera?
2) thinking about pixel size, FPS and size sensor, should i buy the qhy (or zwo) 178 or 290?
i add some images with my actual set
Should i buy the QHY 178 MM or the QHY 290?
Should i buy the QHY 178 MM or the QHY 290?
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- marktownley
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Re: Should i buy the QHY 178 MM or the QHY 290?
Hi there,
I din't think there is anything to gain going for either of the cameras over what you have already. Why do you want to upgrade the camera?
I din't think there is anything to gain going for either of the cameras over what you have already. Why do you want to upgrade the camera?
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Re: Should i buy the QHY 178 MM or the QHY 290?
The sensor and pixel size of the ARO130 is the same as IMX224. As a comparison, the 178 is 7.37mm x 5.63mm.
The small sensor of the ARO130 is only 4.8mm x 3.6mm which means that with a 400mm scope it will not fit a full disc of the Sun.
The size of the sun's disk is roughly 1/100 the focal length = 4mm in the PST. 178 is big enough to show a full disc.
A big advantage of the QHY version of the 178 is that it is available in the guide camera MINI format and is USB3 and this means that it replaces a 1.25" EP and it can often be placed further into the focuser so has fewer demands on the back focus (BF) of the scope. With ZWO there is a choice between expensive (174) and cheaper (290) in a guide camera MINI format but no 178. 178 and 290 are similar prices and the QHY 178 is a much more interesting choice.
The QHY has a longer barrel (up to the first fin) compared to a ZWO and comes with an AR coverslip (can use the camera for normal or IR with the appropriate filter). It also has a 25mm extension, so finding focus is over a very wide range of positions. It also has a 1.25" parfocal ring that can be clamped so that it is parfocal with your favorite EP. One disadvantage of the 178, is that the thread for a 1.25" filter is on the 25mm extension and not on either the coverslip, the internal thread or a 5mm extension.
Simon
Re: Should i buy the QHY 178 MM or the QHY 290?
Ok, excellent,
about why change the camera Is just because i was thinking i could have better pics. But if the difference Will be little then i can keep my actual camera.
Thanks a lot
about why change the camera Is just because i was thinking i could have better pics. But if the difference Will be little then i can keep my actual camera.
Thanks a lot
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Re: Should i buy the QHY 178 MM or the QHY 290?
Hi,
The IMX178 sensor would normally be ideal, with its 2.4um pixels for sampling at F10, however, it also has weird bayer matrix artifact problems with sub-angstrom HA wavelength. So it's hard to recommend it. It's a gamble. Otherwise, the pixel size and sensor size are ideal for your PST. The 290 sensor is too small for a full disc in your PST, so scratch that.
Look for this camera on ebay used:
Point Grey Research Camera FLIR Flea3 FL3-GE-28S4M-C (or any decent camera with the Sony ICX687 sensor).
It has larger pixels, but they're still an ok match for sampling at F10 and the sensor size is big enough for a full disc. I see these for $325 on Ebay.
Very best,
The IMX178 sensor would normally be ideal, with its 2.4um pixels for sampling at F10, however, it also has weird bayer matrix artifact problems with sub-angstrom HA wavelength. So it's hard to recommend it. It's a gamble. Otherwise, the pixel size and sensor size are ideal for your PST. The 290 sensor is too small for a full disc in your PST, so scratch that.
Look for this camera on ebay used:
Point Grey Research Camera FLIR Flea3 FL3-GE-28S4M-C (or any decent camera with the Sony ICX687 sensor).
It has larger pixels, but they're still an ok match for sampling at F10 and the sensor size is big enough for a full disc. I see these for $325 on Ebay.
Very best,
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Re: Should i buy the QHY 178 MM or the QHY 290?
ASI178MM is a really good camera for full disc imaging. It works best from f/7 to f/11, depending on seeing conditions and the sampling formula. It may require taking a flat to avoid the fixed pattern in the final image, I never noticed it on full discs, however, only in hires imaging depending on the setup and the use of focal reducers.
Raf
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