Lagoon in Ha 26th

[Tony Leece]

Very first go at Ha 12 nm
ED80, Canon 300D, AZEQ6GT
lights 82x150 seconds
Darks 30
Flats 30
Bias 30
Processed in Pixinsight (total newbie) Thanks for the tutorials Bill
Will grab more data plus OIII and colour asap
Any critiques apreciated.

[neurosis3000 (Reggie)]

Cracking shot! Can’t wait to see it completed with Oiii 👍🏼

[Tony Leece]

Thank's Reggie mate, tried last night but couldn't nail the focus

[RyanJones]

Well done Tony. That’s a nice clean Ha you have there. Looking forward to your other bandwidths.

[neurosis3000 (Reggie)]

Any chance you could focus with another filter with similar focus then switch?

[Tony Leece]

Thanks Ryan

That did cross my mind the other day Reggie, then i forgot must be my age. Thanks for reminding me mate, i'll give it a go next time haha

[RyanJones]

Originally Posted by neurosis3000

Any chance you could focus with another filter with similar focus then switch?

Not really. It might be close but not spot on. The focal point isn’t just dependant on the filter thickness but also the way the different wavelengths of light travel through your telescope. This is what causes chromatic aberration.

[raymo]

Can't you focus on a nearby star with a Bahtinov mask or with Liveview,
and then swing back to your target?
raymo

[Tony Leece]

Unfortunately its a case of picking one of the bright stars and using the finder on the camera,i even use the moon. Also it's a 17 year old canon 300D, no live view of rotatable LED panel. i have to take 5-10 second shots with a bahtinov mask on and look at them, then change focus a tiny bit and re shoot, it can take blooming ages and involve rolling around on the concrete at 2 am....not fun

[raymo]

The only thing I can think of right this minute, if you are not already doing it,
is to set your ISO to its max [1600?] to shorten your focusing shots a bit.
You can get a model with Liveview body only for less than $200 on ebay,
save you a lot of grief if you can run to it. For a few $ more you can get one
with the articulated screen, which incidentally will be a lot bigger than your screen.
raymo

[Tony Leece]

Thanks mate, will be my next save for purchase I think) ;