Lenses & Hotspots

In simple terms, some lenses when used with modified cameras at certain focal lengths produce unwanted hotspots (significant image blemishes) in the centre of the images. These can be removed using software, but it can be time consuming – much better to use lenses that don’t produce these blemishes.

To understand more about this issue with lenses on converted IR cameras read: DPanswers Hotspots

ir_hotspot

Example of IR lens hotspot

The following is a list of M43 lenses that are reported as having hotspots or not. There are more comprehensive lists covering other sensor sizes in the links at the bottom of this page.

NO HOTSPOTS REPORTED (these are OK)

Olympus M43

  • 12mm f/2
  • 9-18mm f/4-5.6 ED
  • 14-42mm f/3.5-5.6 ED
  • 14-42mm f/3.5-5.6 II R
  • 14-150mm
  • 40-150mm f/4-5.6 ED MSC

Panasonic 

  • 14 mm f/2.5 H-H014
  • 20mm f/1.7
  • 45mm f/2.8 Macro
  • 12-35mm f/2.8
  • 14-42mm f/3.5-5.6 G Vario H-FS014042
  • 14-45mm f/3.5-5.6
  • 45-175mm f/4-5.6 X
  • 45-200mm

Sony E-Mount

  • Sony FE 28–70mm F3.5–5.6 OSS
  • Sony Zeiss Sonnar T* FE 55mm F1.8 ZA

Note: I am currently building a list of good and bad Nikon lenses.

DOCUMENTED AS SHOWING SOME HOTSPOTS (be careful or avoid)

Olympus

  • 17mm f/2.8 (above f12)
  • 45mm f/1.8 (hotspot @ f/9)
  • 60mm f/2.8 Macro (hotspot @ f/9)
  • 75mm f/1.8 ED Lens (low contrast & hotspot @ f/4.5)
  • 12-50mm f/3.5-6.3 EZ *(from f9 and above)

Panasonic 

  • 8 mm f/3.5 (hotspot @ f/10)
  • 25mm f/1.4 (hotspot @ f/5)
  • 7-14mm f/4 (hotspot @ f/9)
  • 14-140mm f/4-5.8 (hotspots from 14-25mm)
  • 45-200mm f/4-5.6 G MEGA O.I.S. (low contrast in IR)

Voigtlander 

  • 25mm f/0.95

OTHER SOURCES:

4 thoughts on “Lenses & Hotspots

  1. BYRON

    Overall, the ability to use adapted lenses gives Micro Four Thirds a great advantage in overall versatility and the practice has gained a somewhat cult following. Image samples can be found readily online, and in particular on the MU-43 adapted lenses forum.

    Reply
  2. Karl Blessing

    Funny enough I do recall getting hot spots with my Olympus 12/2.0, however that’s on an unmodified E-M5 when using either the B+W 092 or Hoya R72. (I’ll need to check again and make sure I’m not using a UV filter in front as well, since there could be some rear reflectance off the sigma ‘protector’).

    I have a full spectrum E-M1 inbound, so I’ll be able to compare there as well.

    Reply
    1. Karl Blessing

      PS: I can verify that I don’t get hot spots on my Panasonic 20mm f/1.7 either when using any of the IR filters.

      My favorite lens for use with the B+W 092 and for long exposure (it’s my long exposure/sfx lens) is an adapted 1951 Canon Serenar 35mm f/2.8 for the Leica Thread Mount. Going to be more awesome when the full spec cam arrives. ( http://i.imgur.com/p0l2Qt4.jpg )

      Reply

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