Do I have a good copy of Canon EF 100mm f/2.8 Macro USM?

I am a beginner, plz advise

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From what I can tell yes
It seem like you had some water on the lens in the last shot

um.... I have checked my lens, no any trace of water droplets though

Do they look sharp to you?

looks pretty ok to me since that is the first lens I have except the kit lens
btw, my camera is canon rebel XTi.

hehehe, then why are you asking use lame ducks and geriatrics?

They look sharp Be happy and go shoot somethin'!

Just remember the DOF can be really thin on a macro lens unless your shooting at the smallest aperture.

Looks good to me. You just have to get used to the extremely shallow DOF that you get when entering the macro range. Focusing is the biggest challenge and auto-focus doesn't work that well up close. Check out the macro forum for some great tips, advice and examples. It’s a great place to learn.

Looks good to me. Excelent Bokaw. Looks like you had water drops on the lens at the time you shot.

Water drops? Perhaps you guys are confusing water drops to bokeh (the nice circles in the out of focus areas in some of those pictures?)

Sjprg what is bokaw? Is that some sort of flower?

I used f/2.8 to max out the shutter speed because it was so windy yesterday. I was wondering why the focus area was so narrow. thank you for the tips

Unless you are trying for a very narrow dof, stop it down a little and you will be Amazed. I have this lens and love it.

jeffreyleung@hotmail.c​om wrote in post #2215211
I used f/2.8 to max out the shutter speed because it was so windy yesterday. I was wondering why the focus area was so narrow. thank you for the tips

You'll need to determine what the optimal aperture is for your lens under macro conditions. For my Sigma 105, it's f/11. I'm sure yours will be in that area as well, but you might peek in the macro forum for to see what others using the EF 100 are using. If you have a tripod, use it and take a series of images of some small object, such as the tip of a sharpened pencil, inside your home under ambient light.

If you're just using your lens for general photographic purposes, it should be pretty darn sharp throughout. Get a volunteer to sit near a window with good lighting and take a few head shots, focusing on their eyes. You'll know soon enough if you have a sharp lens.

Tony-S wrote in post #2215347
You'll need to determine what the optimal aperture is for your lens under macro conditions. For my Sigma 105, it's f/11. I'm sure yours will be in that area as well, but you might peek in the macro forum for to see what others using the EF 100 are using. If you have a tripod, use it and take a series of images of some small object, such as the tip of a sharpened pencil, inside your home under ambient light.

If you're just using your lens for general photographic purposes, it should be pretty darn sharp throughout. Get a volunteer to sit near a window with good lighting and take a few head shots, focusing on their eyes. You'll know soon enough if you have a sharp lens.

Yup, most lenses are NOT (not sure if any even are) the sharpest wide open.

sjprg wrote in post #2214410
Looks good to me. Excelent Bokaw. Looks like you had water drops on the lens at the time you shot.

Tom Bokaw?

There's no such thing as a bad 100mm macro lens. It all has to do with the expertise of the operator.