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IR Hotspot - Lens Ratings
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Infrared light contamination can subtly unbalance contrast or cause an obvious blemish. Lens coatings and lens design are the cause and digital sensors make the issue worse. This page shows precisely how well a few lenses cope with demanding infrared lighting situations. The information below describes what this means and how likely you are to see the problems.
Auto Focus
Manual Focus
CANON EF
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7.8 - 16-35/4.0 [P | S]
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6.2 - 70-200/4.0 [P]
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7.6 - 100-400/4.5- [P | S]
Sigma
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6.0 - 12-24/4.5-
Tamron
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7.8 - 90/2.8 [M]
NIKON F (AF-D)
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7.2 - 24/2.8
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7.7 - 50/1.4
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8.5 - 85/1.8
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7.6 - 18-35/3.5+
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8.2 - 20-35/2.8 [P]
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6.4 - 80-200/2.8 [P]
SONY E (FE)
Sony / Zeiss
Zeiss Batis
Zeiss Loxia
Sigma DN
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0.0 - 85/1.4
Contax G
CANON FD
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7.2 - 24/1.4L
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6.1 - 35/2.0
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8.3 - 50/1.2
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8.7 - 35-70/4.0
NIKON F
Non-AI [F]
Non-AI [K]
AI / AI-S
Zeiss
Voigtlander
PENTAX PK
Takumar
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9.6 - 135/2.5
OLYMPUS OM
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7.1 - 24/2.8
MINOLTA MD
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8.9 - 135/2.0
CONTAX C/Y
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7.9 - 60/2.8
M36 (CZJ)
M39 (Leica)
M42 (Generic)
KONICA AR
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9.0 - 21/4.0
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8.6 - 24/2.8
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9.0 - 28/3.5
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8.2 - 40/1.8 [C]
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8.6 - 50/1.4
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9.4 - 50/1.4 [2 | C]
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9.3 - 50/1.7
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9.0 - 50/1.7 [2 | C]
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8.9 - 50/1.8
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9.5 - 52/1.8
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9.7 - 55/3.5 [M]
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9.4 - 57/1.2
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8.4 - 85/1.8
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9.7 - 100/2.8
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9.3 - 105/4.0 [M]
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10. - 135/3.2
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10. - 135/3.5 [2 | B]
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10. - 200/3.5
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9.1 - 35-70/3.5
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9.3 - 35-70/4.0
SONY E (FE)
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7.0 - 50/0.95
CAMERAS
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8.8 - Sony RX1 - 35/2.0
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SONY E ....
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(AI-S) ...........
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24 ..............
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24-70 .........
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5.7 ..............
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8.0 ..............
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_._ .............
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/2.8 ...........
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/3.5- ..........
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(Sigma) .......
-
[P] ..............
-
[B] ..............
-
[C] ..............
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[M] ..............
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[S] ..............
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[2] ..............
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[STM] ...........
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[SF] .............
Key

Scores
What these scores might mean for your photography. The chance you'll notice a hotspot (HS) and how reliable / consistent the contrast is likely to be:
- Perfect
- Good
- OK
- Meh
- More Meh
- Poor
- Bad
- Very Bad
- Extremely Bad
- Ridiculously Bad
- Unusable
- (HS: 0%)
- (HS: 1%)
- (HS: 5%)
- (HS: 10%)
- (HS: 20%)
- (HS: 40%)
- (HS: 60%)
- (HS: 80%)
- (HS: 90%)
- (HS: 95%)
- (HS: 99%)
Manufacturer / Mount
Lens Type
Prime (Focal length)
Zoom (Focal Range)
HS Rating
HS Rating - Estimated
HS Rating - Coming Soon
Max. Aperture (fixed)
Max. Aperture (Varies)
Manufacturer
Premium Lens
Budget Lens
Compact Lens
Macro Lens
Stabilization
Version Number
Stepping Motor
Soft Focus
Special Infrared lens
SCORE NOTES
Reading The Results
The scores you see above are achieved at f/8 using an 850nm infrared filter (effectively only showing invisible IR light). If you would like to see how the lens scores are different apertures click on the the link. Also see the key above to understand exactly which version of the lens that was tested.
What Are Hotspots
Essentially this is infrared light showing up in the frame where is shouldn't. A 'Hotspot', specifically, is a spot in the center of the image, but there are other forms of internal reflection that serves no purpose in separating, they're all annoying. This should not be confused with lens flare however.
These issues are caused by the lens, its construction and coatings. Infrared light contamination is usually not caused by the camera, conversion, adapter, filters, exposure time or light from outside of the frame.
Specific Lens Versions
While making this page I became aware that the infrared performance of a lens drastically depends on the version. This is typified by the various series of manual Nikkor lenses. You can almost see a pattern emerge that suggests newer coatings are progressively worse. For this reason I try to include as much information about the lenses version as I can. Nikkor series F lenses (earlier pr-AI with black metal focus rings) have been consistently some of the best performing for infrared, although it's worth noting that they don't necessarily give sharp results at lower/mixed wavelengths due to channel offsets (especially the wide angles).
Lower Wavelengths & Colour IR
Lower wavelengths of infrared show less intensity from the hotspot issue. This is due to some of the light coming from visible light, which is unaffected. This works logically when processing like a b&w image. However, the hotspot can appear worse when processed as a colour image. For example if your foliage is yellow and your sky is blue, the hotspot can show up as yellow in the clouds (where it would otherwise be blue or grey). Once you notice this issue it's hard to ignore it and even harder to fix than a b&w image.
**Anti-Reflective Filter Coatings
Anti-reflective (AR) coatings on infrared filters can help to reduce the hotspot intensity. In my experience this is only noticeable when the coatings are applied to the internal filters. External filter coatings had no obvious effect on the lenses that I tried. However, it's worth noting that this was tested before I started this more accurate rating system. Click here to see how much effect internal AR coated filters had for me (using this same scoring system).
Perfection Achieved
Until recently I didn't think that it would be possible to see a 10/10 score with a normal lens, but some of the Konica telephoto lenses have reached this level. This means that the brightness of the background in the center of the image is as it would be if the light was not there. Lenses will almost always produce a hotspot to some degree in IR. This is something that commonly affects newer, wider and faster lenses more, but there are no set rules for this so specific testing must be done to be sure.
My Infrared Photography Galleries