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Cameras, Lenses and Accessories: Discuss hot spot?...I took this photo today using a 50mm 1.8 nikkor lens with no filters, got home and saw this on ...
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Old 13-08-2010, 05:25   #1 (permalink)
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hot spot?

I took this photo today using a 50mm 1.8 nikkor lens with no filters, got home and saw this on a couple of shots done outside. I often get a hotspot with an infrared filter but this is the first time I have seen something without a filter. Conditions were low light and I was looking for something a little different. Does anyone else get this? Or were the conditions perfect for this to occur?

Camera Info
Device: Nikon D40X
Lens: 50mm F/1.8D
Focal Length: 50mm
Focus Mode: Manual
AF-Area Mode:
VR:
AF Fine Tune:

Exposure
Aperture: F/22
Shutter Speed: 2s
Exposure Mode: Shutter Priority
Exposure Comp.: -3.0EV
Exposure Tuning:
Metering: Matrix
ISO Sensitivity: ISO 100

Please ignore the awful resizing

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Old 13-08-2010, 12:07   #2 (permalink)
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Re: hot spot?

The way I understand IR hot spot, "It is reflective infrared light inside the lens and will show up in the center of the picture". I've only ever seen this effect with a select few lenses. I don't see it in this picture.
I see the area your arrow is pointing and the purple tint, maybe an exposure/white balance blip.
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Old 13-08-2010, 23:25   #3 (permalink)
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Re: hot spot?

The purple tint is the issue, I get a hot spot in the same place with an infrared filter on this lens. I am more puzzled than anything else as I took a series of photos in the same area using the same WB, Exposure and Focal length yet the two pictures of ths waterfall came out with a purple spot, nothing else did. Since there was no sun or glare - at that time of the day the sun was behind me. (its miserable here at the moment as well), and I did not have the same issue on other shots I am more wondering if someone has seen this before.
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Old 14-08-2010, 11:19   #4 (permalink)
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Re: hot spot?

I've had that, magenta spot in the middle of the frame, with my 16mm (M42 Zenitar 16mm Fisheye)

Only happens when fully closed and usually when there's a bright(er) source of light at the edge of the frame (or just out of frame) - same subject of waterfalls when slowing the shutter speed to achieve a little motion blur. If I shield my lens (usually using my hand) and back off f/22 to f/16 then it's OK
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