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Author Topic: LensAlign question  (Read 11974 times)
budjames
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« Reply #20 on: December 26, 2008, 12:14:41 PM »
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Joe,

I checked out the link you posted. Frankly, I'm not sure what this has to do with LensAlign?

Bud
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Bud James
North Wales, PA
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jani
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« Reply #21 on: December 27, 2008, 07:12:05 AM »
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Quote from: budjames
Joe,

I checked out the link you posted. Frankly, I'm not sure what this has to do with LensAlign?
I think the lesson to be learned is that it's insufficient to test merely one part of the image frame before making adjustments.

I'd be surprised if the LensAlign documentation didn't mention this, though.
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Jan
budjames
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« Reply #22 on: January 01, 2009, 03:14:09 AM »
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I finished calibrating all of my lens for my Canon 1Ds MkIII with my new LensAlign. I used 10x the focal length as the distance between the sensor plane and the focus chart on the LensAlign. Lenses were all tested at their maximum aperture.

The micro adjustments needed were as follows:

16-35 f2.8 L +6
24-105 f4 IS L +7
100 f2.8 Macro 0 (also the sharpest lens of the bunch)
100-400 f4.5/5.6 L -3
70-200 f2.8 IS L +3
24-70 f2.8 L - the front focusing was so bad that it still was not aligned at the maximum adjustment of +20.

I spoke to Canon tech support afterwards and the tech agreed with me that it must be a lens problem as the others were all adjusted within a relatively close range. This lens is 6 years old and I'm sending it to Canon for service.

The 16-35 f2.8 is the original version and seemed to be the softest lens of the bunch. I might consider a Canon prime wide angle. Does anyone have firsthand experience with how the newer Canon 16-35 II lens compares to the original 16-35?

Cheers and Happy New Year!
Bud James
North Wales, PA
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Bud James
North Wales, PA
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Chris_Brown
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« Reply #23 on: January 01, 2009, 09:24:12 AM »
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Quote from: budjames
The 16-35 f2.8 is the original version and seemed to be the softest lens of the bunch. I might consider a Canon prime wide angle. Does anyone have firsthand experience with how the newer Canon 16-35 II lens compares to the original 16-35?
I do. The second version is better in all regards to the first, but it's not perfect. Corner sharpness was the biggest issue for me because I have typically used these lenses at larger apertures (typically f4) and higher ISO ratings. There are unofficial lens tests here which compares both lenses to other brands in separate tests. You can also rent the lens from Lens Rentals to get a first hand opinion.
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~ CB
stever
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« Reply #24 on: January 01, 2009, 07:45:21 PM »
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Bud, that is interesting information, how would you rate sharpness improvement from a 3 or 6 unit correction?

what is one unit of micro-adjustment?  are the units the same for all canon cameras? e.g is it scaled for the 50D?
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davidbicho
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« Reply #25 on: January 02, 2009, 07:27:55 PM »
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I made a LensAlign Lego this evening.

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budjames
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« Reply #26 on: January 02, 2009, 10:40:12 PM »
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Quote from: stever
Bud, that is interesting information, how would you rate sharpness improvement from a 3 or 6 unit correction?

what is one unit of micro-adjustment?  are the units the same for all canon cameras? e.g is it scaled for the 50D?

The difference is very slight between  a 1 to 3 unit micro adjustment. It seems that the telephoto lens are affected more by the finer gradations. This probably has to do with the shallower depth of field when lensaligning telephotos wide open as compared to shorter lenses.

I don't know what the unit of measure is for a micro adjustment. My previous postings was results achieved with my 1DsMkIII. I also have a 40D, but it does not have the micro adjustment feature.

Bud James
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Bud James
North Wales, PA
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JDClements
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« Reply #27 on: January 02, 2009, 10:44:11 PM »
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Quote from: budjames
I don't know what the unit of measure is for a micro adjustment.

I don't think there is a unit of measurement. It is just an arbitrary scale.
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JDClements
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« Reply #28 on: January 02, 2009, 10:45:08 PM »
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Quote from: davidbicho
I made a LensAlign Lego this evening.

That brings a smile to my face! Thanks for sharing that.
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budjames
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« Reply #29 on: January 03, 2009, 04:07:06 AM »
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Quote from: davidbicho
I made a LensAlign Lego this evening.


If you let my 11 year old son incorporate this into his Lego Star Wars battle cruiser, you might be able to side step the patent infringement. LOL!!!

Bud
« Last Edit: January 03, 2009, 04:07:50 AM by budjames » Logged

Bud James
North Wales, PA
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davidbicho
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« Reply #30 on: January 03, 2009, 09:02:25 AM »
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Quote from: budjames
If you let my 11 year old son incorporate this into his Lego Star Wars battle cruiser, you might be able to side step the patent infringement. LOL!!!

Bud

Some where deep down in the darkest part of my cellar I should have a Lego Mindstorms set - the one where you can write code and control motors and sensors of all kinds. Maybe I should call in sick and build a Completely Automatic Calibration Monster Thing X5000?
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budjames
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« Reply #31 on: January 03, 2009, 09:30:51 AM »
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Quote from: davidbicho
Some where deep down in the darkest part of my cellar I should have a Lego Mindstorms set - the one where you can write code and control motors and sensors of all kinds. Maybe I should call in sick and build a Completely Automatic Calibration Monster Thing X5000?

Perhaps you can build a device that mounts, tests and set the micro adjustments for each of our lens unattended incorporating your "LegoAlign". That way I can spend more time watching my Luminous Landscape Video Journal collection.

Speaking of LLVJ, aren't we due for a new chapter? I think edition 17 was release last March.

Cheers.

Bud James
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Bud James
North Wales, PA
www.budjamesphotography.com
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