Argh - A Direct Hit!

[PhotoGav]

First Ha 1800s sub has just rolled in...

Bit of a direct hit from air traffic control!

[Stu]

How annoying!

I guess that's the problem with longer subs, more time wasted and more chance of this sort of thing happening.

Looks nice apart from that!

[Davey-T]

Happens like that some nights gave up trying to do the Witch Head recently due to the continuous convoy of aircraft.

Dave

[StuartJPP]

Just get another ~10 of them and no problem...that is the purpose of sigma rejection.

[steppenwolf]

5 hours with the clone tool, no problem! or .......... SD Mask!

[SilverAstro]

Phew ! That's ok then, what a relief !!

The last time I saw a topic title like that it was no laughing matter, the poor fella had received a direct deposit straight down the tube from a creature overhead. Some time back, an overseas member, I think not a bird, fruit bat or similar was it ?

Made a right mess of his mirror

 

[PhotoGav]

Second sub now in...

Look at that, yes, another hit down the left hand side. It looks like it's going to be that kind of an evening!

This one should sigma clip out, but that first one is going straight in the bin.

[Stu]

It's crazy how many planes there are around these days. Driving home this evening, I counted at least ten in the sky at once, and that is not uncommon round here.

[Davey-T]

Just looked my latest sub and two trails straight through the middle quite dim though, maybe O111 suppresses it a bit.

Dave

[DaveS]

I've got RAF Northolt attracting planes from every which way.

Another reason to take lots of shorter subs.

[PhotoGav]

I'm relieved to report that the third sub is in and not an aircraft to be seen!

[Randalloverby]

We have them in this area all the time, I can manage 40 90s subs and have to get rid of 10 of them.

[swag72]

When I image south facing, I am continually getting planes in the subs as my south face is on the Alicante airport 'corridor'..... damn those tourists coming for the rain and snow  Don't throw that first one away Gav, it will stack out.

[PhotoGav]

I've just watched the all sky cam timelapse of the night and the number of airplanes is just ridiculous! Funny how you don't really notice or think about it until you have a long lens pointing at the flight corridor...

Sara - I like your optimism about the first one stacking out, but I have found in the past that such bright trails from aircraft still leave a trace with Nebulosity. It copes much better at getting rid of satellite trails, but an aircraft is just too much for it.

[ultranova]

Ah yes, I had the same problem last night, out of nine 15 minute subs

4 had been hit.

I don't suppose living 12 miles form the UK'S fourth busiest airport, ( Stansted )

and being on a major route from the planes that take off from Heathrow,

has anything to do with it. :).

what we need is for some clever person to make a program that rejects bright straight lines

solid or intermittent on a single sub.

at this rate I would have to take 50, 15 minutes subs so sigma can reject them, which equates to

about 3 months imaging time.

I love this hobby.  

[johnrt]

Couldn't help but be intrigued by this;

 

 

What is the air speed velocity of an unladen swallow?

 

Back on topic, I usually get a couple of aircraft through my subs a night, and PI clipping rejects them really well, but I certainly don't get as many as that!

 

[PhotoGav]

@ultranova - aaaarrrrgggghhhhh, it's not funny is it! I've often heard that sigma clipping will eliminate these trails, but the big and bright three line aircraft trails always seem to leave a faint legacy in my processing.

 

[PhotoGav]

2 minutes ago, johnrt said:

What is the air speed velocity of an unladen swallow?

A very good question... The answer to which is approximately 11 m/s or 24 mph.

At least they don't leave light trails in subs, though the kind of direct hit that @SilverAstro mentions earlier might become an issue!!!

[johnrt]

Just now, PhotoGav said:

A very good question... The answer to which is approximately 11 m/s or 24 mph.

Is that an African or European swallow?

[PhotoGav]

Just now, johnrt said:

Is that an African or European swallow?

Sorry, I should have been more specific in my answer: "Huh? I... I don't know that."

[SilverAstro]

6 minutes ago, PhotoGav said:

often heard that sigma clipping will eliminate these trails

I'd try wing clipping first

 

[SilverAstro]

5 minutes ago, SilverAstro said:

I'd try wing clipping first

Perhaps I'd better explain that a bit backyard poultry keepers clip the flight feathers (painless, like cutting your hair) of one wing of their birds when allowing them free range, to stop them taking to the air and heading off into the sunset !

But apart from the jokes I do feel your pain.

This may be quite mad - but I wonder :--

There is a website ( and prob an app for one of these newfangled thingies) called something like FlightRadar, you can track loadsa aircraft especially those near you, time someone made an app for when one is about to coincide with your gps it can suspend exposure ??

 

[SilverAstro]

The more I think ! , , ,

The height info. is also available, so it would not be beyond the wit of a mathmatician to triangulate in 3d, define a field of view, compare and if a coincidence is detected ,

, shoot !

, I mean : terminate, , , the shot 

Could be a problem having lots of different length subs though ?

In the olden days we would have rotated a shutter in front of the camera, but that is getting a bit HeathRobinson now

Ok, I'll go sit in a darkened room for a while > > >

 

[PhotoGav]

SilverAstro, you are a genius! I love your idea. The thing is that the intrusion across my field of view is probably of only a few seconds duration, which would make next to no difference to my 1800s sub if blacked out. I reckon this could be a suitable project for Steve Richards, aka @steppenwolf - lets see if he rises to the bait!?!

[ollypenrice]

Trust me, that will be a piece of cake. One of our three full frame cameras is rather venerable and has a set of adjacent dead columns. You can fix anything, though...

Not all Sigma routines are equal. The one in AstroArt 4 was absolutely transformed in Version 5. AA5 also has a 'repair line' feature which is stunningly effective. You mark each end of the line and it's gone, baby gone! On a sub like yours I'd use it on the lines before putting the sub into the stack. It will give the Sigma routine less to do.

One of our imaging friends is an airline Captain. I wonder if his ears are burning???

lly