I've been testing out a
Nikon 18-200mm F3.5-5.6 against a
Nikon 55-300mm F4.5-5.6
I took two pictures of a door knob from an equal distance of about 3 meters away with the same
Nikon d7100 DX camera but each with the different lenses both set to the same focal length of 200mm.
To my surprise, the image taken with the
55-300mm lens gave a considerably tighter crop than the one taken with the
Is this normal, and if so how is this possible? I was under the impression that the field of view should be the same if both lenses are set to the same focal length. I'm asking this question because I bought the 18-200mm lens second hand and I'm worried there is something wrong with it even though it does appear to be fine.
Here are the example photos. Note the meta data on the images do confirm both were taken at 200mm. I was not using a tripod, so there was probably a slight discrepancy, but I did make sure to sit in the exact same position and leaning back against a wall in the same spot to take the photos. The difference in crop was immediately apparent