2023-02-11, 01:48 AM

Hello, I have a question about the numbers generated for resolution under Exposure Opportunities on the Exposure Calculator. For my Celestron 8 SCT with a ASI 533mc camera with a .63 reducer, it is giving me a resolution of 7.3. This number is higher than I was expecting so I think I do not appreciate what it is telling me.

I found this in the help:

So looking at the items listed above,

My system has about 0.6 arc sec a pixel

The Nyquist as best I know how to calculate it is 1.21 arc sec

If is the air mass is as close to 1 as possible and seeing is okay to good, I would expect that to limit me to around 1.5 to 2.x arc sec.

So I am not sure where the 7.3 is coming from or what it is telling me.

Since the exposure calculator under camera data has the correct camera arc sec per pixel at 1x1 bin I know its reading all my setting correctly.

Anyway, any insight into how this value is calculated or what it it telling me would be appreciated as I am finding the more I understand the data in SkyTools the easier it is to plan .

Thank you for your help.

I attached a image of my exposure calculator if that helps

Shawn

I found this in the help:

- Res. - the effective resolution in arc seconds during the block of time. Effective resolution depends on the imaging system, seeing, airmass, and the Nyquist sampling theorem

So looking at the items listed above,

My system has about 0.6 arc sec a pixel

The Nyquist as best I know how to calculate it is 1.21 arc sec

If is the air mass is as close to 1 as possible and seeing is okay to good, I would expect that to limit me to around 1.5 to 2.x arc sec.

So I am not sure where the 7.3 is coming from or what it is telling me.

Since the exposure calculator under camera data has the correct camera arc sec per pixel at 1x1 bin I know its reading all my setting correctly.

Anyway, any insight into how this value is calculated or what it it telling me would be appreciated as I am finding the more I understand the data in SkyTools the easier it is to plan .

Thank you for your help.

I attached a image of my exposure calculator if that helps

Shawn