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Focal Length problem with EF 70-300mm f/4-5.6 IS II USM - shows up as 267mm

MickKazik
Contributor

Hi everyone, I just received my new EF 70-300mm f/4-5.6 IS II USM and I'm battling a big issue.

 

On its long end (supposedly 300mm), the zoom ring rotates all the way but lens indicate 267mm in the photo data (Canon 200D). Since it has got an APS-C sensor, the display on the lens should indicate 480mm. In reality the marker on the lens is lined up at 300mm but on the built in lens display if falls a quarter of an inch short.

 

On my ancient 1D mk II n the indicator on the display should point to 390mm but falls short again. 

 

In both cases only the shorter focal length of 70mm is lined up properly and also shows as 70mm in photo info.

 

Both in-camera info and Lightroom EXIF data indicate incorrect values. Basicaly, the longer you extend, the bigger the discrepancy. Example:

 

70mm = 70mm

100mm = 94mm

135mm = 126mm

200mm = 176mm

300mm = 267mm

 

Do you think I can do anything with it or did I get a faulty piece?

 

Thanks in advance!

42 REPLIES 42


@kvbarkley wrote:

I do, it reports 112-480 on its LCD on my Rebel T6S. And the EXIF shows 300 mm

 


Thanks a lot for sending it on! Much appreciated! Wanna swap lenses?;) It's a lovely piece, happy shooting!

I do as well.

 

I don't recall what its display showed when mounted on my T6s.  (maybe it showed 480)  EXIF data does display 300mm everywhere else.  DPP and PLE.  I don't use Lr.

~Rick
Bay Area - CA


~R5 C (1.0.2.1) ~RF Trinity, ~RF 100~400, +Canon Control Ring

~6D2 (v1.1.1) Retiring ~EF Trinity, others ~DxO PhotoLab Elite ~Windows10/11 Pro ~EVGA RTX 3080Ti FTW3 Ultra ~ImageClass MF644Cdw ~Pixel6 ~CarePaks Are Worth It

I don't show the 35mm eq focal length display very often, I don't see it as useful. The default is the distance/DOF marker display, which is what you usually see.

 

I wish they would put on a Hyperfocal distance display.

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