NON guided images

[Ukastronomer (Jeremy)]

There are three sections under images so I am posting this here

Unlike many images I have the gear but not the ability to set my scope up, celestron Edge on Evo mount, one day I may get help but so far

I rarely look at the images on sites as it reminds me of my limitations

Are there no images here that do any unguided short exposures ? Surely there must be some who can give inspiration

[Atmos (Colin)]

I wouldn’t say it’s done a lot but some do image small bright planetary nebula or bright emission nebula and these are best done with <1s images.

[xelasnave]

Pretty well all my images are unguided usually between 30 to 40 seconds. Have a look in the beginner section and you will see a couple on the first couple of pages. The Orion image was 1000mm fl but the others are 400 mm fl. I star out to use auto guide but usually end up abandoning it and fall back to 30 sec unguided subs...do a couple of hundred and stack etc
Alex

[Startrek (Martin)]

Guided or unguided
Depends on your target, telescope focal length,Bortle no, upper atmospheric conditions, image scale etc etc .........
Both have advantages and disadvantages
I imaged for a year without guiding when I first got into the hobby
Now I always guide in PHD2 ( obviously with the exception of planetary imaging ) Guiding is not all that daunting or difficult to do

[troypiggo (Troy)]

When I think of unguided deep space images, I always think back to alexch's images with his 22" dobsonian and 15s subs:
http://www.iceinspace.com.au/forum/s...archid=4906287

[sil (Steve)]

Mine in the past five years are entirely unguided and untracked. Not exactly a secret, surely you could have tried to search the site as I've repeated myself with advice on this many times.

[wayne anderson (Wayne)]

Hi Jeremy,

Many of my earlier images were taken using standard tracking from an alt/az mount and no guiding setup used.

The trick to alt/az no guiding is to use very short subs 5 seconds to 25 seconds and many of them 200 to 600 of them works well, the stacking process in DSS seems to round out most of field rotation in the central stars, however the edge of the field still shows field rotation in the stars so the final image always needs to be cropped to remove the curved stars.

Thanks, Wayne.

Below are links to some images i posted here that have been taken using
standard tracking from an alt/az mount and no guiding setup used


Centaurus A Galaxy NGC 5128 (alt/az no guiding)
http://www.iceinspace.com.au/forum/s...54&postcount=1


47 Tucana NGC 104 (alt/az no guiding)
http://www.iceinspace.com.au/forum/s...67&postcount=1


Eta Carinae Nebula NGC 3372 (alt/az no guiding)
http://www.iceinspace.com.au/forum/s...45&postcount=1

[Ukastronomer (Jeremy)]

Originally Posted by Startrek

Guided or unguided
Depends on your target, telescope focal length,Bortle no, upper atmospheric conditions, image scale etc etc .........
Both have advantages and disadvantages
I imaged for a year without guiding when I first got into the hobby
Now I always guide in PHD2 ( obviously with the exception of planetary imaging ) Guiding is not all that daunting or difficult to do

Know that, what I am saying is that it would be nice to see more unguided images anyone can take without expensive gear

[rustigsmed (Russell)]

these days with the low noise cooled cmos sensors you can go short subs and get really nice results. but still need a lot of them - see link.

http://www.astrokraai.nl/viewimages.php?id=266&cd=7