The Astro-Imaging Thread

[Rareden]

any requirements on the focal length, i mainly use a 600mm DSLR lens, i do have a 2000mm scope though

[Green Baron]

7 minutes ago, munlander1 said:

Smaller or larger than m31?

Andromeda ca. 3.5*1,5°, m42 ca. 1.5*1.5°, together with the upper and lower stars of the sword maybe the same size as Andromeda galaxy ... +/- window cross.

10 minutes ago, Rareden said:

any requirements on the focal length, i mainly use a 600mm DSLR lens, i do have a 2000mm scope though

This might be a good opportunity to calculate your field of view from chip size and focal length ;-)

And you need a tracking mount for that thing !

[Rareden]

39 minutes ago, Green Baron said:

Andromeda ca. 3.5*1,5°, m42 ca. 1.5*1.5°, together with the upper and lower stars of the sword maybe the same size as Andromeda galaxy ... +/- window cross.

This might be a good opportunity to calculate your field of view from chip size and focal length ;-)

And you need a tracking mount for that thing !

i do, i have a AVX and guider with scope
FOV at 600 should be 3.4 horizontal, 2.3vertical

Edited November 22, 2017 by Rareden

[munlander1]

Getting to 30 degrees Fahrenheit (-2 degrees Celsius). Going to be putting on everything I own.

[Rareden]

44 minutes ago, munlander1 said:

Getting to 30 degrees Fahrenheit (-2 degrees Celsius). Going to be putting on everything I own.

neeeeeehh you'll live, been out in -16 doing astro, camera did not like it

[munlander1]

21 minutes ago, Rareden said:

neeeeeehh you'll live, been out in -16 doing astro, camera did not like it

Fahrenheit?!

[Rareden]

1 minute ago, munlander1 said:

Fahrenheit?!

Celsius

[munlander1]

Anyone know good way to keep water above freezing? 

[RoadRunnerAerospace]

Warm it up

 

 

Or add salt

[Rareden]

add alcohol 

[MaxPeck]

1 hour ago, munlander1 said:

Anyone know good way to keep water above freezing? 

Move it to Florida?

[munlander1]

M42 looking great.

seeing how long of an exposure I can get away with

Overexposing the area around trapezium.

iso 200

exopusure 60 seconds. Can't go higher without tracking errors. 

[Rareden]

29 minutes ago, munlander1 said:

M42 looking great.

seeing how long of an exposure I can get away with

Overexposing the area around trapezium.

iso 200

exopusure 60 seconds. Can't go higher without tracking errors. 

whats your focal length?

[munlander1]

30 minutes ago, Rareden said:

whats your focal length?

1000mm focal length 

254mm aperture 

[Rareden]

Just now, munlander1 said:

1000mm focal length 

254mm aperture 

hmm, your alignment may be slightly off, should be able to get more than 1min 

[munlander1]

21 hours ago, Rareden said:

hmm, your alignment may be slightly off, should be able to get more than 1min 

Going out again. Will try to do a more precise alignment and try again.

Does ISO really matter?

[Rareden]

20 minutes ago, munlander1 said:

Going out again. Will try to do a more precise alignment and try again.

Does ISO really matter?

Iso matters greatly, its the sensors sensitivity to light, the higher the iso the more sensitive it will be to faint light, BUT it will also become more sensitive to the electrical noise and temperature of the sensors pixels which will cause it to produce "Fake signal" which is noise, makes your image look grainy with red blue and green spots. 
There is a fine balance with iso, depending on what camera you have, typically iso 800 is a good spot, good cameras designed for low light you can do 1600-3000

Edited November 24, 2017 by Rareden

[munlander1]

12 minutes ago, Rareden said:

snip

Thanks

[munlander1]

Starting to image. i expect about 2  hours total tonight. plan on going out tomorrow and saturday. 

[Rareden]

4 minutes ago, munlander1 said:

Starting to image. i expect about 2  hours total tonight. plan on going out tomorrow and saturday. 

siiigh, wish the weather was that good here.

[munlander1]

1 hour ago, Rareden said:

siiigh, wish the weather was that good here.

0 degrees here with clear sky's.

 

i wish you clear sky's:)

[Rareden]

12 minutes ago, munlander1 said:

0 degrees here with clear sky's.

 

i wish you clear sky's:)

theres a good reason newzealands called the land of the long white cloud...

[munlander1]

Had a pretty great night. Plan on going out tomorrow night 

Edited November 24, 2017 by munlander1

[kurja]

On 23.11.2017 at 3:34 AM, Rareden said:

neeeeeehh you'll live, been out in -16 doing astro, camera did not like it

What problem did you have? I've seen batteries last for a lot less in arctic weather, and had a laptop crash unless heated, but all of my cameras have worked without a hiccup down to around -30 celsius.

[Rareden]

7 hours ago, kurja said:

What problem did you have? I've seen batteries last for a lot less in arctic weather, and had a laptop crash unless heated, but all of my cameras have worked without a hiccup down to around -30 celsius.

for some reason, nothing saved to the card