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help with problem

djh698 14 5.4k 6 United Kingdom
25 Mar 2013 10:50PM

I took some pictures the other day with a 50 mm lens and a polarisor and when I put them on the computer they had a purple circle in the middle. Any ideas of the cause? This did not happen when I changed lens.

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wheresjp 10 102 United Kingdom
25 Mar 2013 11:28PM
Could always try the lens with and without the filter. If the purple spot appears in both you may have some dirt on the lens (front or Back). If it just with the CPL filter give it a clean and if it persists check for any defects or blemishes. Check to see if it appears with other lenses, if so you may have dirt on the sensor.

Hope this helps!

RavenTepes 8 226 United States
26 Mar 2013 7:12AM
Just a thought....it could also be a speck of dust on the sensor itself
26 Mar 2013 9:16AM
This looks like an infrared hotspot . It is not uncommon and can be seen with ordinary daylight photography too - as purplish haze in the centre of the image. Your image is typical of that - as infrared reflection off snow can be very strong. This is an occasional thing and changes with lens aspect toward subject, etc. I would not worry too much - this is perfectly fine, just a particular thing about your lens use in some extreme conditions.
Gaucho 16 2.8k 2 United Kingdom
26 Mar 2013 9:27AM
Lens flare? Were you using a hood? The 50mm usually doesn't need a hood but if you had a filter stuck on it...
26 Mar 2013 9:48AM
It is indeed a hot-spot caused by flare (non-image-forming light). Using a hood wonít help. Some Nikon 50 mm f/1.8 autofocus lenses are particularly susceptible to this type of flare.

You can reduce the intensity of the hot-spot by using a larger aperture (i.e. a smaller f-number, such as f/4 instead of f/16), but that would simultaneously increase the area of the hot-spot, possibly making it harder to clean up in post-processing. Sometimes a small, intense hot-spot is easier to fix in post-processing, but sometimes a low-intensity ghost over a large area (most or all of the frame) isnít noticed in the first place.

If itís a serious problem for you, choose another lens. I believe the old manual-focus 50 mm f/1.8 Nikkors do much better in this regard, for example.
djh698 14 5.4k 6 United Kingdom
26 Mar 2013 12:18PM
Thanks for all the comments-I had never heard of a hotspot before.It sounds as though that is what it was.

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