6 replies to this topic

[JADO]

Currently I run a SW Esprit80/ASI2600MC for wide field DSO which puts me at 1.94, and a TS-Optics 8"/ASI533MC which is .78

 

I am in the market to buy another scope/camera to nail down the small DSO's but have a bad case of paralysis-by-analysis.  I've been looking on Astrobin at the targets/equipment and had a question......to use an example, an Askar 120APO (FL 840mm, f/7).......if using my 533MC it will of course be slightly smaller in the image than the TS-Optics since it is 1000mm vs 840mm.....but if I use something like an ASI224MC it would be much larger in the image and would put me at .92  (same with ASI385MC).....but yet I don't see those cameras being used on Astrobin except for scopes like 8" SCT's or something similar.........am I getting something wrong or backward (pulling up this data in astronomy.tools)?  I have not had a lot of lucky imaging with long FL's (had murder trying to image an 8" Edge).  I like the attributes of refractors and have also considered the 190MN or RC (collimation issues aside)..............

 

Thanks!!! 

[Bob Campbell]

Currently I run a SW Esprit80/ASI2600MC for wide field DSO which puts me at 1.94, and a TS-Optics 8"/ASI533MC which is .78

 

I am in the market to buy another scope/camera to nail down the small DSO's but have a bad case of paralysis-by-analysis.  I've been looking on Astrobin at the targets/equipment and had a question......to use an example, an Askar 120APO (FL 840mm, f/7).......if using my 533MC it will of course be slightly smaller in the image than the TS-Optics since it is 1000mm vs 840mm.....but if I use something like an ASI224MC it would be much larger in the image and would put me at .92  (same with ASI385MC).....but yet I don't see those cameras being used on Astrobin except for scopes like 8" SCT's or something similar.........am I getting something wrong or backward (pulling up this data in astronomy.tools)?  I have not had a lot of lucky imaging with long FL's (had murder trying to image an 8" Edge).  I like the attributes of refractors and have also considered the 190MN or RC (collimation issues aside)..............

 

Thanks!!! 

the 224mc is a planetary camera.

 

So how small DSO are you interested in? Take M97 (owl) for example. I classify that as small, and your TS-optics newtonian should do nicely. there are really good images of M97  a SW explorer 200P/asi585mc, which is essentially your newtonian/533.

 

so why do you need another rig?

 

Bob

[JADO]

 Thanks Bob......yes I have imaged M97 with my newt (matter of fact, I did it last night)......

 

Smaller than M97:

M57

M17

M75

M73

NGC 2571

NGC 6790

NGC 6833

NGC 6807

etc.....etc......

 

 

Do I NEED another rig?  Probably not.....I also have 15 guitars in my music studio and I probably could do with 3      But please don't tell my wife that......

 

I do thank you for your reply......I guess my question has more to do with if I am looking at the right data points to determine a "need"

Edited by JADO, 17 April 2025 - 07:27 PM.

[Bob Campbell]

 Thanks Bob......yes I have imaged M97 with my newt (matter of fact, I did it last night)......

 

Smaller than M97:

M57

M17

M75

M73

NGC 2571

NGC 6790

NGC 6833

NGC 6807

etc.....etc......

 

 

Do I NEED another rig?  Probably not.....I also have 15 guitars in my music studio and I probably could do with 3      But please don't tell my wife that......

 

I do thank you for your reply......I guess my question has more to do with if I am looking at the right data points to determine a "need"

well, if you insist to getting a new rig, better make it snappy before the tariffs kick in. . I've seen an excellent M57 from an 11" edge HD  with a asi6200mm which would need a filter wheel and a big mount. As you point out the long FL is an issue for imaging.

 

https://app.astrobin...BBbD2h&i=orfb6q

 

Your wife would totally love that

 

Bob

Edited by Bob Campbell, 17 April 2025 - 08:41 PM.

[JADO]

Good thing I have an understanding wife.....up to a point anyway

 

I actually just sold a Celestron XLT 11" last week.......it was so heavy and cumbersome to try to put on the mount.......I was afraid I'd drop it.....getting old I guess!

[Bob Campbell]

Good thing I have an understanding wife.....up to a point anyway

 

I actually just sold a Celestron XLT 11" last week.......it was so heavy and cumbersome to try to put on the mount.......I was afraid I'd drop it.....getting old I guess!

how about this thread:

 

https://www.cloudyni...nd-photography/

 

seems to have good advice

 

Bob

[mayhem13]

I’d instead just get a Televue Paracorr 2 coma corrector for the newt….it has a built in mag factor of 1.15 and will be bring you to 970mm fl or so. Your field with be flatter as a side benefit as well and it will still be faster than most fracs at f5.75

 

The 224 sensor is just a cropped version of the 2600 and 533….same pixels….allows for a faster frame rate for planetary imaging. I have all three and getting something on that tiny chip without really good plate solving is very difficult. It’s not cooled either so there’s that. 
 

I use 3 different coma correctors with my 8” f4 newt for three different focal lengths…..the Starizona Nexus gives me an FL of 600, the OE corrector gives me 815 and the Paracorr gives me 920….a very versatile system.