internal reflection?

[ho_co]

Any idea what might have caused these arcs?

21/2.8 with 60mm filter thread. Bright sun to the right, bright enough to cause clouds to cast shadows.

L1005796 Sh 1.jpg

L1005796 Sh 2.jpg

Thanks!

[jaapv]

I think they are atmospheric reflections on ice crystals high in the atmosphere, like sundogs. I must have a quite spectacular image of them, I'll have a look in my archive tonight. Otherwise, a diaphragm reflection...

[hoppyman]

Howard, I'm not sure what that is in the sky, but there's three really fast jets attacking it!

[jaapv]

Found it already!

[wparsonsgisnet]

Geez. bitch, bitch, bitch and you still take better pix than I do. Also, you seem to travel to very nice places.

What I don't understand is how Jaap keeps getting all those lion cub pix under the ski lift.

[Terry Kelly]

Looking at Howards photo the artefacts seem to be too regular to be ice crystals, and look very much to be the same shape as the blades on the lens diaphragm. How they got there I can only guess that, as you surmise, they are internal reflections between the lense elements each side of the diaphragm.

Regards
Terry

[cbretteville]

Jaap's shot shows a phenomena called "Sun dogs".

From Wikipedia:

Sundogs are formed by plate shaped hexagonal ice crystals in high and cold cirrus clouds or - during very cold weather - by ice crystals called diamond dust drifting in the air at low level.

Howard's is definitely not the same, looks more like flare or internal reflection to me.

Carl

[Tom Johnston]

howard, just curious, where is this location? thanks

[ho_co]

Tom--Masada, Israel.

My initial post dumbly said the sun was bright enough to cause clouds to cast shadows. Duh!

In this picture, you can see darker areas beneath clouds. Since this is over the Dead Sea, there may be some effect I'm not used to making the shadows visible. Particulates, maybe? Just don't confuse those shadows with this arc.

Not sun-dogs. Those are bright, and I've got pictures of them as well. Jaap's is a good shot of them. This looks to me as if it might be a shadow of the rear section of the lens, cast by internal reflection.

It's the only picture with that effect, but the fact that it so clearly shows an arc is reminiscent of a number of pictures the camera shot when new. I don't know what Leica did, but they cleared up that initial defect. That original problem occurred with several lenses, and on maybe 5% of my images. (I posted a thread on the forum at that time.)

Any suggestions are of interest.

Originally Posted by hoppyman

Howard, I'm not sure what that is in the sky, but there's three really fast jets attacking it!

Yeah, Geoff. I had to go back same time the next day to catch them.