Many zoom lenses on the market have a ‘macro’
badge slapped on them, but their maximum
magnification ratio is usually only about 0.3x to
0.5x. The same is also true of some prime lenses that carry
the macro moniker.
For this group test, we’re comparing leading macro lenses
that deliver a full 1.0x or 1:1 magnification ratio at their
closest focus setting, but what does that actually mean? In
a nutshell, a 1.0x magnification ratio enables an object to be
reproduced on a camera’s image sensor at full life size. So,
for example, something the size of a regular postage stamp
will pretty much fill the whole image frame of an APS-C
format camera. This translates into enormous enlarging
power when you view the resulting image on-screen or in
print. Indeed, at a 100 per cent zoom setting ona computer
screen, you’ll be able to see fine detail that’s invisibletothe
naked eye.
We’ve chosen full-frame compatible macro lensesforthis
round-up, but they’re equally suitable for use onanAPS-C
format body. There are advantages in doing justthat,as
the crop factor of the smaller image sensor givesaneven
greater ‘effective’ magnification. We’ve also majoredon
lenses with a focal length of between 90mm and105mm.
These give a comfortable working distance of around
14-15cm between the front of the lens and what you’re
shooting. The Sigma 70mm Art lens is the odd oneout.
As well as having a shorter focal length, its physicallength
extends at closer focus settings.GROUP TEST