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ASI183MM or ASI1600MM for me?

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#1 fetoma

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Posted 17 June 2019 - 06:42 AM

Folks, I have a "wanted" ad for an ASI183MM. I've been going back and forth on this decision for a while now vs. the ASI1600MM. Here are my concerns and maybe your opinions will help me.

 

1) I already have an SX filter wheel with LRGB and NB 1.25" filters.

2) The scopes in my sig would be used at focal lengths 480mm (80/480), 540mm (M73), 800mm (R200SS), 1800mm (VC200L), 1278mm (reduced VC200L)

3) SQL is around 19.5/19.7ish

 

The main reason I was avoiding the 1600MM was because of the non-AR coated glass and the reflections/bright star patterns it creates, especially with all my scopes except the refractor. I was figuring the 183MM may be a better fit with my concerns.

 

What do you guys think?

 

Thanks!


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#2 PirateMike

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Posted 17 June 2019 - 07:12 AM

Well that is quite a spread of focal lengths, and neither camera would be optimal for all of them.

 

If I were you and if I had to purchase just one camera of the two, it would be the 1600.

 

See my sig and notice that I have both cameras. Also note that I will be purchasing another (CCD) to accommodate the RC8 and a future longer focal length scope.

 

Disclaimer... Other recommends may be different than mine. 

 

 

Miguel   8)

 

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Edited by PirateMike, 17 June 2019 - 07:13 AM.

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#3 fetoma

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Posted 17 June 2019 - 07:26 AM

I agree that the 183 would be a bad match for the VC200L's long focal length, but the other scopes would work fine I think.


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#4 PirateMike

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Posted 17 June 2019 - 07:51 AM

I think the deciding factor should be the image scale that each camera and scope combination would produce.

 

It seems that the general wisdom calls for an image scale of between 1 and 2, but imaging outside of this range is not something that is strictly adhered to.

 

The smaller the image scale the more bloated the stars, the larger the image scale the more pixelated the stars.

 

Here is the formula for determining image scale... Image Scale = (Photo Site in um / Focal Length in mm) * 206.265

 

 

I have no knowledge of the SX filter wheel. It may fit, it may not. You probably already know whether or not it will work.

 

 

Miguel   8-)

 

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#5 Gipht

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Posted 17 June 2019 - 08:56 AM

I have  had the ASI183 mono camera for over a year now and have gravitated towards using it in the shorter to mid focal lengths,  330 to 750 for me.   One problem is the amount of sensor glow for the longer exposures at higher gain.  It has been, at times, a challenge to calibrate the amp glow out.  Not everyone seems to have experienced this problem.  If you still intend to use your D5100, then the 183 contrasts nicely pixel pitch wise for that camera.

 

I recently purchased the APS-C sized ASI071MC-pro, and that camera sure is impressive.


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#6 bobzeq25

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Posted 17 June 2019 - 10:52 AM

Folks, I have a "wanted" ad for an ASI183MM. I've been going back and forth on this decision for a while now vs. the ASI1600MM. Here are my concerns and maybe your opinions will help me.

 

1) I already have an SX filter wheel with LRGB and NB 1.25" filters.

2) The scopes in my sig would be used at focal lengths 480mm (80/480), 540mm (M73), 800mm (R200SS), 1800mm (VC200L), 1278mm (reduced VC200L)

3) SQL is around 19.5/19.7ish

 

The main reason I was avoiding the 1600MM was because of the non-AR coated glass and the reflections/bright star patterns it creates, especially with all my scopes except the refractor. I was figuring the 183MM may be a better fit with my concerns.

 

What do you guys think?

 

Thanks!

I think you're doing fine.

 

Be aware that the 183 (I have one) has tiny pixels that are signal to noise ratio challenged, it requires more total imaging time.  I bought it for a Celestron 8 RASA, F2, it's well suited to that specific scope.




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