Gear Talk > Lenses

Is my Canon 100mm macro broken? Soft everywhere

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dmills:
This may sound a little stupid, but I had this problem once, so it's worth checking. Look under the rear cap and make sure there isn't a big fingerprint or something on the rear element that's causing the blur. My wife often holds my camera lens as I'm changing, and once there was an inexplicable fingerprint there that screwed up a few shots until I looked and saw what was going on. Forgive me if you've already checked that, but also, if you're living in a place where it's getting warmer, moving from an air-conditioned environment to a more humid environment can give you fog on the lenses until it has a chance to equalize.

knkedlaya:
Could be problem with the autofocus precision. With my 7D and 100mmL combination AF is always soft, it never bothered me since I always use manual focus for macro. Manual focus gives me good results. I have observed this glowish effect with 50mm with 25mm extension tube till f4 or so and they vanish at smaller apertures(above f4), never seen this in my 100mm. Is it possible for you to post the best in the lot image you made at large aperture and in munual focus mode?
Couple of images shot  @ 2.8 manual focus.

Orion:
If you look at the 2nd image, of the eyes, you will notice the reflection in her eyes is weird. . . . it's shape/diffraction makes it seem like one of the glass elements in your lens may be slightly off its intented position/angle, etc (the blur and 'diffraction' seem to have upward motion, instead of even blur or haloing. . .it's all shifted. . . and it is not the case that in the eye example, the eyes happen to be oveal shaped and causing the type of blur etc.

Kingnog:
Thanks for your help, everyone who responded. I'll see if I can get it repaired.

Marsu42:

--- Quote from: Kingnog on May 01, 2012, 12:57:35 AM ---Thanks for your help, everyone who responded. I'll see if I can get it repaired.

--- End quote ---

If it gets repaired and you re-test it: The lens' sharpness peaks at 6.3-7.1 (shoot macros here!) and gets softer below to a rather soft 2.8. Even when ok, a 100% crop @f2.8 with this lens will look no better than the trees you posted.

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