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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 08 Jan 2018 (Monday) 12:40
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What Prime would you suggest?

 
anitaw2
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Jan 08, 2018 12:40 |  #1

ok, I'm sure this question has been asked a number of times, but I'm starting a new thread. I was having problems with my 85mm 1.8 on my 7D. I tried it on my daughter's camera canon T5 and on a canon 6D and it worked perfectly. I have a canon 7D and it just wont lock focus most of the time so this lens is not meant to be ...I bought it used. I love the look of the 135L lens so It was suggested the 85mm.

What are your suggestions for under $1000. I know most of you tried every lens on the market and you know which ones to keep away from and which ones you love. Any suggestions would be much appreciated. I would even buy a new canon 85mm 1.8 because when it did lock focus, it was beautiful.


Anita W.

  
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ed ­ rader
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Jan 08, 2018 12:46 |  #2

if the 85 wasn't locking focus there was an issue with the lens, the camera or the operator.


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TeamSpeed
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Jan 08, 2018 12:50 |  #3

Amazon..... (that is the prime I use)


:D

That being said, I agree with Ed, there is something wrong that should be addressed. You don't want to use the 6D as it can focus in much lower light than the 7D and could give false impressions about any capability or lack of with the 7D, but I would run more tests side by side with the T5 perhaps? Same scene, etc...


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cristphoto
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Jan 09, 2018 07:34 |  #4

Per your post it sounds like the problem is with the camera since the same lens focuses fine on two other bodies. Have you tried another lens on the 7D?


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MalVeauX
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Jan 09, 2018 08:06 |  #5

The issue is most likely with the camera body and/or the operator. If the lens operates appropriately on other camera bodies, then something is likely going on with your current camera body and it's settings and how your AF is setup, which is operator choices. I think we've been through all of your 85 & 7D MFA and AF issue threads and all. I know you've done some MFA with your 7D and the 85, but not really sure how accurate it was done.

Did you ever perform the dot tune MFA method?

Very best,


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Left ­ Handed ­ Brisket
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Jan 09, 2018 08:21 |  #6

I agree that the problem is likely not the lens.


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Jan 09, 2018 12:45 as a reply to  @ MalVeauX's post |  #7

AFMA itself won't likely cause AF acquisition issues, it is a final step motor change at the end of the focusing function as a positional offset.

However, it is possible other AF changes or functions on the 7D might be causing issues perhaps, as you have pointed out. It might be best to do a complete factory reset on the 7D and start over?


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anitaw2
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Jan 09, 2018 13:33 |  #8

cristphoto wrote in post #18536967 (external link)
Per your post it sounds like the problem is with the camera since the same lens focuses fine on two other bodies. Have you tried another lens on the 7D?

I have a canon 70-200 f4 and Sigma 17-70 2.8 and they work great. I rarely if ever miss focus.


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anitaw2
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Jan 09, 2018 13:34 |  #9

TeamSpeed wrote in post #18537187 (external link)
AFMA itself won't likely cause AF acquisition issues, it is a final step motor change at the end of the focusing function as a positional offset.

However, it is possible other AF changes or functions on the 7D might be causing issues perhaps, as you have pointed out. It might be best to do a complete factory reset on the 7D and start over?

Good Idea


Anita W.

  
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anitaw2
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Jan 10, 2018 08:32 |  #10

Got home last night, did a reset on my camera and took out the battery. Put the battery back in, tried the lens and it seems to be focusing perfectly and fast. I just played with it in the house (it is freezing out) so on the weekend, I'm going to try it outside. I hope this fixed the problem but now I'm stumped because my 2 other lenses were working perfectly...


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Jan 10, 2018 08:42 |  #11

It has been shown that sometimes a complete reset will fix random issues that pop up with AF. I don't believe we have ever figured it out, but that is the reason the suggestion to do a reset is given so many times. Just like Windows boxes, sometimes a reboot just fixes things inexplicably. :)

In other situations, even a reflash of the same firmware you have might fix issues. Again, this is inexplicable. My guess is that system level registry values and settings that the user cannot directly influence get corrupted, and a reset and/or firmware reflash resets all of that back, ie. there might be a memory leak in the Canon firmware code that corrupts AF tables, etc.


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cristphoto
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Jan 10, 2018 08:57 |  #12

anitaw2 wrote in post #18537779 (external link)
Got home last night, did a reset on my camera and took out the battery. Put the battery back in, tried the lens and it seems to be focusing perfectly and fast. I just played with it in the house (it is freezing out) so on the weekend, I'm going to try it outside. I hope this fixed the problem but now I'm stumped because my 2 other lenses were working perfectly...

Yes it is perplexing. Perhaps there was a micro-adjustment setting in the body for the suspect lens. But even that should just be a fine tuning adjustment at best - not enough to throw images out of focus. Glad to hear you have it solved.


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anitaw2
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Jan 10, 2018 18:36 |  #13


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after rebooting my camera, I shot this with the 85mm (focus on nose)...what do you think? it looks like it's focusing a lot better. I will try shooting outside this weekend and see if the focus is better.

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zoom_zoom
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Jan 11, 2018 04:59 |  #14

Focus looks good to me. Looks like the reset worked.




  
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Jan 11, 2018 06:36 |  #15

Sometimes you can get some crud on the contacts, which causes problems. Taking the lens off and on will then wipe the crud off and everything works fine, leaving you scratching your head.




  
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What Prime would you suggest?
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