MFT Lens Turbo II Flare

Started Jul 13, 2017 | Discussions thread
Alan WF
OP Alan WF Senior Member • Posts: 2,326
Re: have you seen this...

SiFu wrote:

Hello!

... older comparison? The issue might be comparable to the hotspotting?

https://www.dpreview.com/forums/post/53156458

Best,

Alex

Yes, comparable in the sense that they both makes a mess of your image, but the origen, susceptibility, and appearance in the image are very different:

  • Origin: Hot spots are ghost images of the pupil caused by reflections between the two surfaces, normally the sensor and one of the lenses. This glare is caused by internal grazing reflections within the focal reducer lens barrel.
  • Susceptibility: Hot spots depend critically on the adapted lens exit pupil position. This glare depends on the illumination in and around the field.
  • Appearance: Hot spots appear in the center of the image and tend to be more or less in focus. This glare appears towards the light source and is hugely out of focus.

Regards,

Alan

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