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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 07 Apr 2012 (Saturday) 12:44
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"Good" copies

 
weegee
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Apr 07, 2012 12:44 |  #1

I have a love/hate relationship with this website. You all make me spend money :lol::lol::lol:. I used to be so happy with my 30d and kit lens many years ago. Now, several years later and several thousand dollars lighter, I've got tons of stuff I never knew even existed.

After reading about all the micro adjustments being done, I broke down and bought the Focal software.

So I ran it on my 5 lenses. 17-40 was spot on. 50 didn't register an accurate result, but most seemed to be in + range, so I gave it a +2. The others were in the +/- 3-4ish range. On a couple focal lengths I got up to 5 or 6 range.

So, what does that all mean? Am I going to notice a difference on those kinds of adjustments? I guess my question is, how bad is a -3 or +4 to having a "good" copy?


My Online Gallery: http://fotoluigi.zenfo​lio.com/ (external link)
Elan II, 5D3, 17-40L f/4, 24-105L f/4, 70-200L f/4, 85 f/1.8, 50 f/1.8

  
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AbPho
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Apr 07, 2012 12:51 |  #2

Why do you need the Focal software? I use a 24x36" canvas print. It is not a good idea to adjust zoom lenses unless you only use the one focal length, or the lens is really out across the whole range. The 50mm f/1.8 is not easy to MA. The focusing mechanism is not fine enough for small adjustments.

I ended up getting more consistent in focus images after spending the time doing the micro adjust.

No value is bad. Unless you are outside the +/- 20 range. Don't get caught up in the good/bad copy thing. If they work then it's good.


I'm in Canada. Isn't that weird!

  
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sandpiper
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Apr 07, 2012 12:52 |  #3

Those sound pretty good to me, all clearly within the manufacturing tolerances.




  
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weegee
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Apr 07, 2012 12:59 |  #4

AbPho wrote in post #14225833 (external link)
Why do you need the Focal software? .

Because I'm a lazy bastard and kept second guessing myself, and let the pixel peepers on here get to me :o. I tried various DIY tests and kept getting different results.

I'm pretty happy with the software though. But I'd probably just go for the middle package next time around. The pro stuff is nice, but not necessary for me. A lot of that info is available elsewhere, like sharpest sweet spot, etc. Anyway, just a $20 difference or so, so it's not the end of the world.


My Online Gallery: http://fotoluigi.zenfo​lio.com/ (external link)
Elan II, 5D3, 17-40L f/4, 24-105L f/4, 70-200L f/4, 85 f/1.8, 50 f/1.8

  
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AbPho
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Apr 07, 2012 13:08 |  #5

Haha. Too funny.

Like I said...I used a canvas print. I found it easier than using a piece of paper with the scale printed on it. I used a distance around 35x the focal length away from the camera. I found this is where I would typically shoot a portrait from. At 50x (which is what Canon recommends) I found the distance too great. This method is highly recommended by me since it is free. :D

If you read up on Canon's recommended procedure you will see that they suggest you MA the lens/camera at the scene where the images will be taken. The values can change depending on the conditions.

My values range from -5 to +13.

There was a good write up on the net but the article has since been taken down. I think the author was using a schools server to host his website. :D


I'm in Canada. Isn't that weird!

  
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JeffreyG
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Apr 07, 2012 13:33 |  #6

If you can get the lens to focus perfectly with anything between +20 and -20 then the lens is fine.

I've had lenses that needed +17 on one body a -0- on another. That's fine.


My personal stuff:http://www.flickr.com/​photos/jngirbach/sets/ (external link)
I use a Canon 5DIII and a Sony A7rIII

  
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bunyarra
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Apr 08, 2012 15:57 |  #7

http://www.lensrentals​.com …lens-and-camera-variation (external link)


-------------
Michael Gove
http://photosignals.sm​ugmug.com (external link)
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weegee
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Apr 08, 2012 23:05 |  #8

thanks for posting. Good info.

Well, I made all my adjustments. Haven't had a chance to test them out in the real world yet. Curious to see how much improvement I see. And I definitely want to go back in a couple weeks and run the tests again. Curious to see how consistent they are.


My Online Gallery: http://fotoluigi.zenfo​lio.com/ (external link)
Elan II, 5D3, 17-40L f/4, 24-105L f/4, 70-200L f/4, 85 f/1.8, 50 f/1.8

  
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"Good" copies
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