NGC7380

[Fay]

I'm thinking this a is a bit too big!

11x600, QSI 583ws, 0.85fr, 7nm ha, SW120 Equinox Pro.

I have a problem with imaging at the zenith, at the moment. Lost 30 mins of this as stars suddenly go egg shaped. Would have done OIII as well, so problem to sort out

Thanks,

Fay

[Dave Smith]

That is an interesting image - reminds me a bit of mammous clouds.

Dave

[Fay]

Never heard of those Dave!

Fay

[MikeD]

Very nice work.

Mike.

[Fay]

Thanks Mike, appreciated

Fay

[RobH]

Very nice. Lots of good detail.

Do you recalibrate your guider near the zenith?

Rob

[Coco]

Looks super fay

I had the same problem with my MN190 at the zenith, set the balance to perfect instead of weighted on the east ( when imaging first in the east ) and it cleared up.

There is no harm in doing what Rob suggests and re calibrate the guiding towards the Zenith...

.

[Scott Tilley]

Really nice detail. Not too big for me!

Scott

[Dave Smith]

Never heard of those Dave!

Fay

Probably because I used the less common name, Mammous or Mammatus clouds.

Not my photo.

Dave

[ScubaMike]

Gorgeous image Fay.

I'm always impressed with the standard of the images on here (and the modesty of the imagers!)

[Komet]

I would love to see this in full nb Fay.

Well done (and yes it is large - I had to stand in the garden and peer through the window to see it!) 8-))

[ollypenrice]

Good one Fay. As I said eleswhere you might try a wieght to one side of the OTA to take out zentih backlash.

More mammatus from my front door;

[Komet]

More mammatus from my front door;

Looks more like the entrance to a cave Olly!

[steppenwolf]

Very nice image, Fay, I love this area of the sky and you've caught some great detail in it.

[ollypenrice]

Fay, I've started a thread on Zenith balance on the Imaging Disussion board to see what people think.

http://stargazerslounge.com/imaging-discussion/159348-zenith-balance.html

Olly

[NeutrinoWave]

That is an interesting image - reminds me a bit of mammous clouds.

Dave

Really impressed with your Observatory Project Dave

[Fay]

Thanks for all the comments. Just going to look at your thread Olly.

Never heard of or seen those clouds before, interesting! No never thought of it Rob

Fay

[ollypenrice]

OK, Fay, don't thow your bad zenith subs away. You can use them for noise reduction on the faint parts of the image, though their serious resolution is lost.

Stack your bad subs on thier own.

Rotate them in Ps till the egg-ness is either vertical or horizontal.

Make a copy layer.

Select Blend Mode Darken in layers.

In filters got to Other and Offset.

Choose an offset based on whether your distortion is horizontal or vertical.

Try an offset value like 1 pixel or 2.

The stars will get rounder.

If they get squashed so that now they are egg shaped the other way, that's great because...

Now you go to Edit-Fade-Fade Offset and fade the offset till they are round.

Flatten image and save.

Now you can add this to your stack of good subs but, when you do so, erase anything bright because the dodgy subs don't have good resolution. But for faint nebulous background they are just fine and that's where you want to reduce the noise.

Tracking;I think you should try a wieght to one side. I like my theory though I haven't tested it yet!! See what Chris thinks, he's smarter than I am!

Olly

[Fay]

My hero, Olly, thanks for all that.

Chris may have jet lag, he has been in USA for 3 months

Fay