Flare in a J-12

[DeeCee3]

Look Again...

Look Again...

Still not clear how a round lens element would make flat, straight-lined, straight-edged flare.

All the flare I've ever seen is circular or in some way rounded.

If you'll note the first frame attached at my initial post, and to a lesser degree the other one, too, you'll see that the "ghost" does not really have a straight edge. I think one side of it may be fairly straight but the other side has a definite "bow" effect to it.

I live out in the boondocks and the nearest hobby store is 50 miles away but I'll pick up a small bottle of Floquil engine black and a rigger brush next time I venture out of the mountains, and see if that won't fix it.

Meantime, I have another 35mm lens I can use...probably not as good as the Jupiter 12 but acceptable.

Again, thanks to you all.

dc3

 

[VinceC]

>>I think one side of it may be fairly straight but the other side has a definite "bow" effect to it.<<

That's because the light is spilling over a hard edge and disipating on the other side.

 

[oscroft]

Looking at those photos, I see the smudges of light are purple. That suggests to me that the light that caused them has come from the back of the camera, through the orange film base (orange = negative purple) and then struck the emulsion. So if I had to gamble, my money would be on a light leak coming from somewhere at the back, and nothing to do with the lens. (Though do bear in mind that part of the reason I rarely gamble is that I seem to be good at losing).

 

[oscroft]

Oh, and the other thing that suggests to me that it's not caused by the lens is that the two photos were taken in completely different lighting conditions, but both show exactly the same light smudge in exactly the same position.

 

[MartinP]

Whatever the source of the effect it is a good idea to blacken, very carefully, the edge of the rear element on the lens - so keep that in mind on the trip to town. It should reduce any unwanted light effects, even though I still think the door is the culprit. Is that door loose, or moveable, at all ? Possibly a slight pressure on the door with the light in a particular direction or intensity might open a crack for the mark to be made. The fact that the mark does not completely overwhelm the image suggests that the leak is very subtle . . .