mrred
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"There is a fifth dimension beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition. You're moving into a land of both shadow and substance, of things and ideas. You've just crossed over into the Twilight Zone. "
I've only ever seen the Pentax non planar filter advertisements once in 65 or so getting one in your size probably mission impossible.
Excellent adviceI keep clear or uv filters on all my lenses, as well as caps when not actually being used (I dislike cleaning lenses, it's better to keep them clean). But, whenever difficult situations arise or I want the Nth degree of what the lens is capable of, the filter comes off. At this point the camera is probably on a tripod, so it isn't the hassle some like to make it out to be. My preference is for muticoated filters, even (especially!) on uncoated lenses, single coated are second, I don't use uncoated unless I have to.
There are two on eBay right now.
One you have to buy the whole camera to get....
Search for ASAHI PENTAX 49 UV GHOSTLESS JAPAN
And you know. I can't see any similar ghosts with this darn thing. Now I know what belongs on that M42 SMCT 1.4, it works and it's authentic.
Excellent advice
I always use a deep hood as well preferably rubber.
But I like the single coated signature (pastel) with colour and the adaptive compression in mono.
So I have two sets of LTM lenses SC and MC.
A hood keeps the sun, fingers and sea gulls away from optic surfaces.
I've had a lens drop out of a gbag (concrete) and land on folded rubber hood bounce and nearly caught it on half volley it then landed on back cap. The lens was unmarried apart from paint witness on aperture ring paint. Lenses always seem to land filter ring or registration plate down.
my only guess as to what caused this was internal reflections from somewhere within the pentaprism..
John Koehrer=Your student is making images at night. Why couldn't the effect be caused by light through the VF?[/quote said:The reflex mirror is up during exposure, closing off the focusing screen and pentaprism and eyepiece from the direct optical path between lens and focal plane...no way you would record internal reflections from the pentaprism.
Even if the foam is deteriorated, the light would be a lateral scatter thru the gap in the foam, and not directed in a significant downward direction...only if the light were to strike some reflective surface (which is unlikely, as the mirror box is blackened) would it be directed downward toward the focal plane.
The reflex mirror is up during exposure, closing off the focusing screen and pentaprism and eyepiece from the direct optical path between lens and focal plane...no way you would record internal reflections from the pentaprism.
Even if the foam is deteriorated, the light would be a lateral scatter thru the gap in the foam, and not directed in a significant downward direction...only if the light were to strike some reflective surface (which is unlikely, as the mirror box is blackened) would it be directed downward toward the focal plane.
The reflex mirror is up during exposure, closing off the focusing screen and pentaprism and eyepiece from the direct optical path between lens and focal plane...no way you would record internal reflections from the pentaprism.
Even if the foam is deteriorated, the light would be a lateral scatter thru the gap in the foam, and not directed in a significant downward direction...only if the light were to strike some reflective surface (which is unlikely, as the mirror box is blackened) would it be directed downward toward the focal plane.
Agree with everything you've said. Which is why when it happened to me I was so perplexed when covering the VF eliminated the problems. Maybe just 'one of those things'!
Like I said, it happened to me taking night shots at the Vatican. Maybe it was really angels....
you get the same effect with rangefinders...
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