today I bought the EF70-300L lense to replace my old Tamron 70-300VC. When playing around I noticed that the 300mm on the Canon seem to be a good bit wider than on my Tamron.
Is there a website that actually checks the "nominal" focal length? I remember Lensrentals sometimes comments on the the real focal length but they don't list the details.
Or is there a simple way to calculate it without too much hassle?
Thanks in advance
The 70-300L has a TON of focus breathing and the Tamron has VERY little. At MFD the 70-300L turns 300mm into only 200mm! At 25' it is still only about 282mm. Even at 50' is still doesn't seem to yet reach 300mm. Maybe on the moon it does . Or maybe never. Even shooting across the length of a soccer field, the long way, the old simga 120-300mm seemed to deliver about 280mm if what you call the 300 2.8 IS delivering at 300mm at that distance. (the sigma also seemed to be about f/3.0 if you call the 300 2.8 IS f/2. and the difference seemed to be about the same shooting much closer in too so I think the old sigma 120-300mm was simply really a 120-280mm f/3.0 lens .
At 25' I had to set it to read EXIF 72mm to get same FOV of the 70-200 f/4 IS at 70mm.