One of my regular readers asked for comparative images with and without teleconverters following my recent post. SInce I own Canon products I made three images to make the comparison. The images were shot in RAW, brought into Lightroom where the Lens Profile Correction for the 70-200/2.8L IS II was applied and then exported to JPEG. No other post processing was done. White balance is identical on all images. Camera positioned on tripod, position fixed, light from above using daylight tubes in the Kino Flo DIVA 400
A basic shot at f/5.6, no teleconverter, lens zoomed to 200mm, effective focal length 200mm
Same position with the 1.4x converter now inserted. Still f/5.6 set in camera. Lens zoomed to 200mm. Effective focal length now 280mm.
Same position with the 2x converter now inserted. Still f/5.6 set in camera. Lens zoomed to 200mm. Effective focal length now 400mm.
All images were shot with the only change being the addition of the teleconverter and the exposure change in shutter speed to compensate for light loss through the converter.
Depth of field gets shallower at the same aperture when using the teleconverter since the effective focal length is now longer as one would expect.