What focal length to capture the witch head nebula with a DSLR?

[jason32]

Hey guys,

What focal length do I need to capture the witch head nebula? I have a modified canon 100D. Should I go for a 200mm lens or 300?

[steppenwolf]

400mm maximum focal length should do it to get a close fit in the FOV!

[jason32]

1 minute ago, steppenwolf said:

400mm focal length should do it!

Ok thanks I'll check that out

[ollypenrice]

One tip I can pass on concerns satellites. This area is plagued by them. GRRR!!!  If you take lots of subs (really lots) and use a Sigma Reject stacking algorithm that works, then they will vanish. It's a great object. Have fun.

Olly

[jason32]

1 hour ago, ollypenrice said:

One tip I can pass on concerns satellites. This area is plagued by them. GRRR!!!  If you take lots of subs (really lots) and use a Sigma Reject stacking algorithm that works, then they will vanish. It's a great object. Have fun.

Olly

Ok thanks for the tip, will do that have to buy a lens for that, at the moment I have 130PDS with 0.9x corrector but I think its not wide enough right?

[Uranium235]

Yeah, with the 130 youre in the region of a 4 pane moasic - and its getting a little late in the year for starting something like that on Orion.

[jason32]

51 minutes ago, Uranium235 said:

Yeah, with the 130 youre in the region of a 4 pane moasic - and its getting a little late in the year for starting something like that on Orion.

Yeah just wanted to get an idea about the nebula and stuff...;)

[shamantanthew]

8 hours ago, jason32 said:

Hey guys,

What focal length do I need to capture the witch head nebula? I have a modified canon 100D. Should I go for a 200mm lens or 300?

Check this website out: http://www.blackwaterskies.co.uk/p/imagingtoolbox.html

Enter your camera at the bottom and hit calculate (you can leave the default "scope" set, it won't matter), then enter in a lens focal length (just to the left of where you selected your camera) and hit calculate in that box. Search for your object and it'll give you a good idea of the framing.

[jason32]

16 hours ago, shamantanthew said:

Check this website out: http://www.blackwaterskies.co.uk/p/imagingtoolbox.html

Enter your camera at the bottom and hit calculate (you can leave the default "scope" set, it won't matter), then enter in a lens focal length (just to the left of where you selected your camera) and hit calculate in that box. Search for your object and it'll give you a good idea of the framing.

Ok great thanks I'll check that.

[Davey-T]

It fits nicely in the Canon 70 / 200 @ 200mm if you rotate it to line up.

Dave

[frostynixon]

You can use Stellarium to find out about focal length and fov. You can specify your camera chip size and focal length and it will draw a box which will resemble the fov.

[jason32]

Yes I forgot about Stellarium...will check in that.