ASI183MM or ASI294MM ?

mathieucarbou

With the ASI294MM now supporting bin 1x1 with pixel size of 2.3 and high resolution, is there any advantage of the 183MM over the 294MM to use on a short focal length (between 250 and 400) ?

I want to get a mono camera for my scopes, I have placed an order for a 183MM, but after discovering about the unlocked mode of the 294MM, I have asked ZWO to cancel the order so that I can switch to the 294MM.

Tech@ZWO

mathieucarbou use on a short focal length (between 250 and 400)

You can use below tool to calculate which camera is suitable:
http://astronomy.tools/calculators/ccd_suitability

cz550

Bonjour Mathieu ,

Comment as-tu accès au mode déverrouillé ?

mathieucarbou

I don't have the camera yet... But this is indicated on ZWO website.

mathieucarbou

@tech@zwo#52851 Hello, I obviously know this tool, and as you probably know, both cameras are suitable for such focal length... So this is not answering my question ;-)

ASI183MM pro: 12 bits ADC, 2.4um pixel size, 20 megapixels, 5496*3672 resolution, 15k full well capacity, 1.6e read noise ASI294MM pro Bin1: 12bit ADC, 2.3um pixel size, 47 megapixels, 8288*5644 resolution, 14k full well capacity, 0.6e read noise ASI294MM pro Bin2: 14bit ADC, 4.6um pixel size, 11.7 megapixels, 4144*2822 resolution, 66k full well capacity, 1.2e read noise

I inferred the 0.6e read noise with ASI294MM Pro in Bin 1 using the same formula here: https://astronomy-imaging-camera.com/tutorials/everything-you-need-to-know-about-astrophotography-pixel-binning-the-fundamentals.html

ASI183MM QE: >= 80% between 450-650nm ASI294MM QE: >= 80% between 450-650nm

So considering these specs... Is there any advantage (besides the price) of buying a 183MM vs a 294MM ? Right now, I don't see any...

Improve101

mathieucarbou Id go the 294MM, as its twice the megapixels (turns into 47MP in Bin1), 14 bit (more dynamic range), larger sensor so more target in your FOV.