|The Canon MP-E 65mm
Macro Lens &
MT-24EX Macro Twin Lite
by Frank H. Phillips
What is the Canon MP-E 65mm Macro Lens? It's the most advanced macro lens in Canon's lineup, and perhaps the most advanced consumer-class macro available (see the sidebar What is True Macro Photography? for an explanation). It can produce up to 5 times life size magnification, or a magnification ratio of 5:1. It is an exceptionally sturdy, firm, and well-constructed lens. Using an optical formula that features 8 groups, 10 elements, and ultra-low dispersion glass. With all that glass this lens is no lightweight, weighing in just shy of two pounds. A tripod collar is included, and will come in very handy for stationary subjects.
Despite being compatible only with Canon's EOS series of autofocus cameras (including all of Canon's digital SLRs) the MP-E 65mm is a manual focus lens. Being a dedicated macro lens, it cannot be used like a "normal" 65mm lens because it cannot focus more than a few centimeters away from the front element. A mounting ring on the front of the lens is used to attach Canon's macro flashes, the MR-14EX and the MT-24EX.
Some people confuse the 1X - 5X designation with a zoom factor, like the zoom factor on a zoom lens (i.e. a 35-70 zoom lens is a 2X zoom lens). But the MP-E 65mm is not a zoom lens; the 1X - 5X designation indicates that it can produce magnifications of full lifesize (1X) to five times lifesize (5X).
Using the MP-E Lens
The smallest of movements can ruin the shot. The effect is especially pronounced with this lens. Shooting at 1X can be mastered quickly, but hand-holding this lens at 2X or higher can be quite a challenge. If you're shooting a stationary subject its no problem using a tripod (and even some focusing rails).
But if you've got a subject that changes position frequently, there's no time to use a tripod, so you've got to hand-hold, and this is incredibly hard at 4X and 5X. All of the photos of the Harvestman or Daddy Longlegs shown below were hand-held.
Focusing: There are two ways to focus this lens: frame the shot and then twist the barrel to focus (which changes magnification), or set the magnification where you want it and then position the camera to the correct focusing distance.
I use the latter method 99% of the time because for me it's easier, and because I can remember where I had the magnification set when I made the shot for documentation purposes. When I start shooting a subject, I typically set the lens to 2X, then put the lens close in front of the subject, then put my eye to the viewfinder (I often use Canon's Angle Finder C accessory), then move forward and back until the subject is in sharp focus, then I fire.
From there, I'll experiment with more or less magnification, depending on the composition I want. Sometimes I'll shoot an insect at 1X just to document it at lifesize, then experiment to see just how far I can go with magnification.
Depth of Field Issues: Physics dictate that the higher the magnification, the shallower the depth of field for any given aperture setting. So as you can imagine when you're shooting an insect at the high magnifications used in macro photography your depth of field is extremely small, in fact you'll be lucky to get a few millimeters of depth in a shot - even at f/16.
Loss of Light: When you increase magnification by moving the lens elements further from the film plane you decrease the amount of light reaching the film plane (or image sensor). So whether you use extension tubes with a lens or the MP-E lens, as you increase magnification it will become harder and harder to see your subject through the viewfinder because of the light falloff. This means your exposure times increase as magnification increases.
Working Distance: Since the MP-E is a 65mm lens you'll have to get very close to your subject which will often present difficulties. For example, dragonflies are extremely skittish and it's rare to be able to get close to one unless he's eating. Another case is jumping spiders, because as the name implies, these little guys will literally jump onto the lens when it's too close.
Metering Technique: I always shoot this lens at f/16, the smallest aperture setting available on this lens, in order to maximize depth of field. Next, I set my shutter speed to anywhere between 1/90 and 1/250 second, depending on my magnification level and the amount of wind; higher shutter speeds for high magnification or high wind. But how, you may ask, do I get away with simply setting my camera on full manual settings of my choice without even bothering to meter the shot? That's where the macro flash comes in…read on.
Accessory Macro Flash: The two current macro flashes in Canon's lineup are the MR-14EX Macro Ring Lite and the MT-24EX Macro Twin Lite. Both are EX flashes, meaning that they are compatible with EOS cameras employing Canon's E-TTL metering system. I have experience only with the MT-24 flash, so my comments here are based on that flash.
Simply put, if you mount this flash on the front of the MP-E 65mm lens, you control almost 100% of the light on your subject, so metering is no longer an issue, except in cases where the subject or background can "fool" your metering system. An example would be when shooting a small bee climbing over a flower with a yellow center and white petals; in a case like this, the white and yellow will cause the shot to be underexposed, and you'll have to compensate for that by about 1 or 1˝ stops. But in most cases, the metering will be spot-on, so let the E-TTL do the work for you. All you do is set your camera to manual (whatever aperture and shutter speed you wish), set the MT-24 to E-TTL, and fire away…the flash does all the work for you!
The one drawback to this technique is that the flash takes over the shot to such an extent that very little ambient light is included in the shot, especially at small apertures like f/16, which produces a jet-black background in your shot (like the one above). Personally, I like this effect because it removes any distractions that might be in the background and lets you "focus" on the true content of the photograph.
While this isn't a budget setup it will energize your photography and encourage you to explore places you've never seen before. Isn't that worth the price?