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Old 18th of March 2010 (Thu)   #1
harcosparky
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Default 7D With 70-300 IS USM Lens - A Test?

Ok so I live in the woods and have no scientific equipment.
I strapped my 7D to a tripod with the 70-300 lens attached.
To take this shot I selected the center focal point. This rivet on top of the slab of wood was centered in the focal point box, the smaller box covered the shaft.

Camera distance to target - 86" to sensor plane

Manual Mode

Meta Data

f/5.6
1/80 s
ISO 100
70-300@300


Image was cropped in Photoshop Elements with absolutely no PP and saved as a JPEG.
Uploaded to Photobucket and here it is .....





Tomorrow I will do a Macro shot of the same target using a Tamron SP 180mm Macro Lens
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Old 18th of March 2010 (Thu)   #2
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Did you turn the IS off I am fairly sure (without finding the manual) that this generation of IS on this lens needs to be turned off when used on a tripod

Also at 1/80 did you use a cable release or the countdown timer ~ why? because the very act of pressing the shutter can cause the camera to move or vibrate that little bit which could cause "movement".

I have read that the 7D is challenging for the optics and FWIW on my 40D my 70-300 is a tad soft at the 280 to 300 end though does sharpen up acceptably

HTH ?
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Old 18th of March 2010 (Thu)   #3
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Used the timer.

IS ? Damn I am not sure, I was doing a lot of hand held and now looking at the camera looks like it was ON!

We went to a local pond today which has a small turtle inhabited island, some of the pics surprised me and they did look better with this lens then similar shots on the 40D.

We were a good 150 feet away from them. I'll dig up one of those pics and post. They were handheld with IS on.
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Old 18th of March 2010 (Thu)   #4
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Turtles ....

f/14
1/80s
70-300@300

Handheld with IS on.

For this one I was just trying to see what was out there and I do believe I selected center focus point and had it between those two turtle though it was probably more towards the one on the left.

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Old 18th of March 2010 (Thu)   #5
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Default Re: 7D With 70-300 IS USM Lens - A Test?

why are you shooting at f14?
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Old 18th of March 2010 (Thu)   #6
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Quote:
Originally Posted by DreDaze View Post
why are you shooting at f14?
Word, why?
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Old 18th of March 2010 (Thu)   #7
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Quote:
Originally Posted by DreDaze View Post
why are you shooting at f14?
I have no real answer for that, we stumbled onto this and actually missed the best shot so I took a quick shot with the camera as it was set from a previous shot.

As we came upon this we say about 7 turtles tumble off the bank into the water, one had just come up and the others were trying.

All of this is about getting used to the new camera and the AF system.
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Old 18th of March 2010 (Thu)   #8
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Hello

I own a 7d and used to have the 75-300 is . Had to trade it by a 70-200 pictures were really soft. Now is a different history.

good luck
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Old 18th of March 2010 (Thu)   #9
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Well I figure the lens to be a tad soft, especially on the extreme end. I have some inside shots done using flash with it in the 170 - 200 range that seem quite good.

I have a Tamron SP 180mm Macro and have take a few test shots with it and the seem to be extremely sharp.

The 70-300 isn't a lens I use all that frequently, I do more with my 17-40 f/4 L and the Tamron Macro

I was just out trying to see what the 70-300 was doing.

I also did some noise tests with the 7D and am amazed at how well it does, as compared to the 40D.
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Old 18th of March 2010 (Thu)   #10
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Hmmm!!!

OK ~ were I you I would repeat the rivet "test" making sure the IS was off.

As for the turtle image ~ well handheld even with IS unless your technique is spot on the lack of sharp focus could be pilot error and do not forget the IS takes about 0.5seconds to spin up & settle. As for f14 ~ not sure about 'this' lens but all lens have what I think is called the diffraction limit i.e. there is a finite aperture for the conditions and the photosite density of the camera sensor where you will not get a sharp image. So go find a subject in good light in the garden and shoot at f5.6, f6.3, f7.1 & f8 all the same subject and see what results you get ~ the sweetspot for the 70-300 IMO is between f6.3 to f8, wide open at f5.6 it does not give of its very best - yes it is OK but not as good if stopped down a little.

All the best
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Old 19th of March 2010 (Fri)   #11
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Default Re: 7D With 70-300 IS USM Lens - A Test?

I know it's not excatly same lens, but I get much sharper pictures without IS when I use my 70-300DO + 5DMKII.
I prefer a quicker speed (minimum twice the focal lengh as a speed) than IS and for low speed landscape (without movin cars or people) I use a monopod or tripod.
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Old 19th of March 2010 (Fri)   #12
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Default Re: 7D With 70-300 IS USM Lens - A Test?

So I went back to that pond and did some more shooting ....

These were shot at:
f/8
1/100 s
ISO 100
70-300@300

Camera mounted on tripod - timer used - IS was OFF

This is was cropped and saved as JPG



This was the same JPG but I sharpened it a bit in PSE Ver 8
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Old 19th of March 2010 (Fri)   #13
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Those crops are from this shot - reduced and converted to JPG

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Old 20th of March 2010 (Sat)   #14
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Default Re: 7D With 70-300 IS USM Lens - A Test?

Are you using a filter on the 70-300? If so, try taking it off. I've found that this lens does not like filters.
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Old 20th of March 2010 (Sat)   #15
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Default Re: 7D With 70-300 IS USM Lens - A Test?

A couple of thoughts?

Looking at the full turtle image it sharpens up quite well in PS ~ so what in camera sharpening settings have you got it set to FWIW I have mine set to the very minimum on my 40D (and before that on my 350D), why, because PS and my eye to judge how much sharpening the image will take is IMO better than letting the camera take control.

In respect of the crops you show ~ these I take are cropped as you say from the "original" you post - yes? If so see above

As for the crop itself you are looking at approx a 20th of the original ~ no one I know will crop an image so severely and expect to get a great image?

If you wish I can post my edit for your review but as you do not "Image Editing allowed" it is poor PoTN etiquette to do so without permission?
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