Note: the maximum magnification on wide-angle lens will be greater with a diopter, since you can focus closer
Recommended Canon Lenses for Underwater Use
Canon 10-22mm, Sigma 10-20mm ...
For maximum magnification, follow these three steps:
1. Use macro mode or a macro lens.
2. Zoom the lens to it's longest focal length.
3. Set focus to the minimum focus distance.
4.
Although all three lenses are bright (maximum aperture f/2.8) and share the same level of maximum magnification, ...
The working distance of a macro lens is the distance from the front of the lens to the subject when the lens is at maximum magnification (1:1).
Press to magnify the current image, there are fifteen steps up to a maximum magnification of 10x. Use the cursor buttons to scroll around the image while magnified.
6 DG MACRO lens, which has been optimised for use with DSLR cameras and incorporates a macro feature with a maximum magnification of 1:2 at the focal length of 300mm, is excellent value for money.
The teleconverter multiplier directly correlates with the increase in magnification; a 2X teleconverter therefore doubles the maximum magnification.
image stabilizer, internal focus, ultrasonic autofocus motor, 9-bladed diaphragm for attractive out-of-focus highlights ("bokeh"); maximum magnification 1:1
Nikon 200mm f/4.
Maximum magnification can be increased to either 1.4x or 2x by using the EF Canon 1.4x or EF 2x multipliers. This is the only Canon macro lens which is fully compatible with the Canon 1.4x and 2x multipliers, which turn it into a 252/4.5 (with the 1.
This lens has a maximum magnification ratio of 1:3.1 (at the focal length of 200mm), making it ideal for close-up photography.
The 16-35mm has a maximum magnification of 0.22x, the 50mm is 0.15x, and your 70-200mm is 0.13x for the non-IS version, 0.17x for the older IS version and 0.21x for the new "Mark II" version. Those might be good enough.
 See also: Magnification, Camera, Lens, Photograph, Image
  
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