Understanding ultra wide help please!!!

Canon EF 70-200mm f/2.8L IS USM

03/16/2008 02:47:55 AM · #1

This is a followup from this thread.
This is the lens i got back. If there's really nothing wrong with the lens i'd like to know. I'm going to set up some "normankoren" lens test thing as soon as i get a chance. I know I'm going to go full frame and would prefer to spend $$$ on an EF 16-35 as opposed to the EF-S 10-22.
I took some shots and tried to see how deep a DOF i could get at around f8-f9 and this is what i got. Am i overeacting because of the 1st lense, it's soft all around? Do i have to use a much smaller aperature say f16 when shooting 10mm? Do different laws apply when shooting 10mm when trying to get the deepest DOF? I've also been looking at some canon10-22mm shots at around f9 and they also seem kinda soft around, except the centre.

[thumb]658268[/thumb]

[thumb]658269[/thumb]

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and then there's this with no softness, just some motion blur on the subject.

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Photologist

Apple iPhone 16 Pro Max

03/16/2008 03:09:07 AM · #2

Dave,

Depending on when you will go FF, you may consider the Canon EF-S 10-22. That lens holds its value and you can probably sell it for very close to what you bought it for. Take a look at eBay or Classified section of the Canon Digital Photography Forums. Most 10-22s are going for mid 600's (USD), which is darn close to the price of a new one.

So, if it is going to be a few months before going FF, the 10-22 may be a good choice for you.

By the way, as if you couldn't tell, I love mine! . . .

Message edited by author 2008-03-16 03:09:25.

MelonMusketeer

Nikon D7000

Nikon MF 50mm f/1.4

03/16/2008 03:12:47 AM · #3

I am seeing the softness in the left side of areas near the edge, in particular the left one, where there is a hard edge and strong contrast. The tower on the left in the 3rd shot is a good example. It looks good near the ground, but soft where it is out in the open sky.

Canon RF 24-70mm f/2.8 L IS

03/16/2008 12:47:23 PM · #4

It does hold it's value Les, afterall it's a canon :)

But if the lens is'nt defective I see no need to send it back. Wqaddy commented that he saw softness on the left side, but i see it on both sides. If i shot it at f16 and up the softness everywhere dissapears and if i move the focal length to say 14, everything is sharp. So is it that at 10mm the DOF has to be compensated by a tighter aperature?
I'm only concerned with 10.

kirbic

Canon EOS R5

03/16/2008 01:08:05 PM · #5

Originally posted by dmadden:

It does hold it's value Les, afterall it's a canon :)

But if the lens isn't defective I see no need to send it back. Wqaddy commented that he saw softness on the left side, but i see it on both sides. If i shot it at f16 and up the softness everywhere dissapears and if i move the focal length to say 14, everything is sharp. So is it that at 10mm the DOF has to be compensated by a tighter aperature?
I'm only concerned with 10.

The wider you go, the wider your DoF is, so if you are seeing more softness at 10mm, that's the lens. It's really hard to tell what's going on from web-sized images, and especially not knowing at what distance the focus was set. As a DoF example, at 10mm and f/8, you should be able to get everything from 2 feet to infinity in focus. At 14mm, f/8, you should be able to get everything from 4 feet to infinity.
The bottom line is, if the performance does not meet your needs, then whether or not the lens meets the manufacturer's quality specs is of no importance.

03/16/2008 01:35:55 PM · #6

Just found out it's officially defective. U can ignore this therad now. Thanks 4 u'r assistance :)

MelonMusketeer

Nikon D7000

Nikon MF 50mm f/1.4

03/16/2008 02:12:29 PM · #7

Originally posted by dmadden:

Just found out it's officially defective. U can ignore this therad now. Thanks 4 u'r assistance :)

I'm interested in how you found out for sure about the defect? Did the objective lens fall off, or did you find out from the manufacturer?

Canon EF 70-200mm f/2.8L IS USM

03/16/2008 02:59:40 PM · #8

I gave it to a photographer that had all these large format prints of some weird looking griddy lines he uses for lens testing.He had a couple different sizes and he shot them at different lengths and aperatures. He also had a sigma 10-20 he compared it to, although it was a nikon version so he said he could'nt rely on that.

Photologist

Apple iPhone 16 Pro Max

03/16/2008 04:05:11 PM · #9

For those that want to test any of your own lenses yourselves, use can use this focus chart.

Dave, this may be similar to what your "photographer" used.