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ASI120MM Question

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#1 Sunspot

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Posted 25 January 2013 - 09:37 AM

Hi all,

Am I correct in believing that the ASI120MM camera has the same (or very close) chip size as the Skynyx 2.0 camera?

Thanks!
Paul

#2 Pete Gorczynski

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Posted 25 January 2013 - 10:49 AM

Both cameras have a 1/3" chip, but that's where the similarity ends. The SKYnyx 2.0 has 640x480 pixel format with 7.4µm pixels. The ASI 120MM has a 1280x960 pixel format with 3.75µm pixels.

Pete G.

#3 Mike Phillips

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Posted 25 January 2013 - 11:41 AM

I know you asked this one before Paul, but I wonder how it compares to the Flea3? I think they're close and I will probably stick with my PGR for the time being.

Mike

#4 Sunspot

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Posted 25 January 2013 - 11:52 AM

I guess the reason I'm curious is when I moved from to the Skynyx from what I had before (has it been that long that I forget already! Wow!) the image size using the same focal length decreased. I was curious if the image size in the 120 would be the same as the Skynyx using the same focal length.

Thanks!
Paul

Mike, I have two Flea3's so moving to another camera right now isn't in the cards...but I'm definitely curious as well how the Flea and 120 compare.

#5 Rankinstudio

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Posted 25 January 2013 - 12:06 PM

I have done quite a bit of imaging with the Flea3 and the 120. I prefer the 120 for sure.

- The smaller pixel size eliminates all the spacers needed with the TV5XPM to fill the chip. Much shorter imaging train, more sturdy.
- I don't need to mess with firewire.
- The noise levels are fantastic.
- It captures a LOT of data very quickly. 1 RGB run creates over 3GB of data with 30 second runs in each channel.
- I can capture at much higher FPS and still get solid results.
- Comes with a wide angle lens.
- Does an awesome job on deep space targets as well.

Just my preference, but the 120 is an awesome cam for a great price.

I am also blown away by how well the data holds up to upscaling.

#6 Sunspot

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Posted 25 January 2013 - 12:57 PM

Wait....are you saying that the image size with the 120 is larger than the Flea3 when using the same focal length by about 1.2x (if I'm interpreting what I'm reading correctly). :confused:

Paul

#7 MvZ

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Posted 25 January 2013 - 01:09 PM

The ASI120MM has pixels with a size of 3.75, versus 5.6 for the Flea3. This means that Jupiter (or any other target) falls onto more pixels, and thus appears 1.5 times LARGER (5.6/3.75) in the 120 when you keep the same focal length. If you were imaging at F/30 with the Flea3, you would now need to image at F/20 with the ASI120MM to get the exact same size of Jupiter in pixels!

#8 Rankinstudio

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Posted 25 January 2013 - 01:34 PM

Yes Paul, the image is way larger. With the same amount of spacers I had for the Flea3, Jupiter wouldn't even fit on the 120. I had to remove all of them just to get it to fit.

I guess the faster FL's are what allow me to shoot at such a higher FPS. Cant wait to try this thing out on Saturn.

#9 Sunspot

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Posted 25 January 2013 - 07:11 PM

Thanks everyone. That sure answers my questions. I do appreciate the feedback.

Paul






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