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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 May 2014 (Tuesday) 20:12
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85mm/1.8 on 6D----- CA, how bad?

 
mickdehun
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May 27, 2014 20:12 |  #1

Hi everyone,
I'm thinking of buying a 85mm/f1.8 for my 6D....have (cheap) zoom, need prime.

I read lots of revuew and had a look at YouTube as well.
I saw in the revuews the CA is bad on crop sensors, but not as bad on full frame. Is this true? Can I expect this lens will be ok on my 6D or it's a 'chance' of what sample I'll get...

The 85mm/f1.8 compare to the 100mm/f2 has better bokeh and cost ~$100 less....
should I buy the 100mm/f2 insted to avoid CA?

Cheers,
Mick




  
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Digital ­ Story
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May 27, 2014 20:18 |  #2

Optically these are the same I would say.


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nightcat
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May 27, 2014 20:31 |  #3

I had the 85mm 1.8 about 7 years ago and didn't like the CA. I picked up the 100mm f2 and have been very pleased. It does have some very light CA, but nowhere as bad. The thing I like best about the 100mm f2 is the bokeh which I found to be much smoother than the bokeh of the 85mm. I also prefer the slightly longer focal length.




  
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CollegeKid
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May 27, 2014 22:10 |  #4
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I'm with nightcat. Had the 85 1.8. Sold it. Have the 100 2. I use it happily on 6D and 60D, although my copy is not sharp at f/2. Stopping down to f/2.2 is a big improvement. Tried MFA, no help.




  
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gabebalazs
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May 27, 2014 22:45 |  #5

Yeah, the CA is the biggest problem with this lens. My 85 is super sharp even wide open, but CA is present. I can reduce it in post but certain scenes are hard to fix, but that happens very rarely fortunately.
I really like the lens overall and it's my go to lens for portraits on FF, and it's on my 70D when I shoot events, while I have either the Tamron 24-70 2.8 VC or the Canon 24-105L on my FF body.
I also have the Sigma 70-200 2.8 OS, which is great but for low light events the 85 1.8 works better on my 70D and compliments the FF + 24-70 well.


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EverydayGetaway
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May 27, 2014 22:54 |  #6

I had the 85/1.8 briefly and returned it partially because of the CA, but mostly because the Rokinon 85mm f/1.4 was so much better to my eyes and even had less CA at f/1.4 and pretty much none at f/1.8 (I owned it first and had to return my first copy due to a stuck aperture).

If you're looking for a cheap portrait prime and think you could learn to manual focus, the Samyang/Rokinon/Bower (all are the same, just different names) is worth a serious consideration, it's a fantastic lens.


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flowrider
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May 27, 2014 23:50 |  #7

Im the other way with the CA issue as in its a non-issue with me. It's one slider in Lightroom. Easy.


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EverydayGetaway
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May 28, 2014 00:22 |  #8

flowrider wrote in post #16934998 (external link)
Im the other way with the CA issue as in its a non-issue with me. It's one slider in Lightroom. Easy.

Sometimes. Sometimes it's not that easy. If you have two colorful areas with a thick CA between them using that slider just makes the CA gray instead if purple or green, it can be just as destructive to a photo.


Fuji X-Pro2 // Fuji X-T1 // Fuji X-100T // XF 18mm f2 // XF 35mm f1.4 // XF 60mm f2.4 // Rokinon 12mm f2 // Rokinon 21mm f1.4 // XF 18-55mm f/2.8-4 // XF 55-200mm f3.5-4.8 // Rokinon 85mm f1.4 // Zhonghi Lensturbo ii // Various adapted MF lenses
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jefzor
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May 28, 2014 00:27 |  #9

You usually get bad CA in situations that are avoidable all together.


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seanp3
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May 28, 2014 00:35 as a reply to  @ jefzor's post |  #10

The 85/1.8 is a super lens for the price. I use mine a lot. I rarely deal with CA. It usually shows when shooting directly into the sun in high contrast situations. I also find lightroom corrects it easily. It's a non issue for me.




  
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bratkinson
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May 28, 2014 02:57 |  #11

flowrider wrote in post #16934998 (external link)
Im the other way with the CA issue as in its a non-issue with me. It's one slider in Lightroom. Easy.

Ditto. No problem to fix at all in LR.


"Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity." General George S Patton, Jr 1885-1945

  
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mickdehun
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May 28, 2014 03:37 |  #12

Tnx everyone,
would it be correct to say: 1. the 85mm/f1.8 has less CA on full frame
2. it's only annoying with glare and bright objects
3. whatever CA is there, it's correctable
4. the 100mm/f2 has less CA but not as nice bokeh

Mick




  
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InfiniteDivide
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May 28, 2014 03:46 |  #13

EverydayGetaway wrote in post #16935033 (external link)
Sometimes. Sometimes it's not that easy. If you have two colorful areas with a thick CA between them using that slider just makes the CA gray instead if purple or green, it can be just as destructive to a photo.

I agree with this. CA is a challenge with any lens wide open. Often the colors of the scene get very distorted.
Pink purple and even red colors should be avoided when anticipating unavoidable CA in the scene.
This can be very difficult when photographing flowers or bright colourful scenes.

To the OP, you should buy a lens at the FL that you desire, regardless of CA.
100mm will have less distortion in the image, at a trade off for less working distance.


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craigbeckta
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May 28, 2014 04:23 |  #14

I just bought an Canon 85mm 1.8 yesterday on the Canon 5D MKIII.

The sharpness is comparable to my Canon 24-70mm MK II.

The Bokeh is really nice as well.

For the price it's a great lens.

I noticed a little CA at 1.8 but was able
to minimize it a bit in post.

I got the lens for the Bokeh effect when I
need it.

I am surprised how good the images look
considering it's not an L series lens.


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titi_67207
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May 28, 2014 04:42 |  #15

mickdehun wrote in post #16935227 (external link)
Tnx everyone,
would it be correct to say: 1. the 85mm/f1.8 has less CA on full frame
2. it's only annoying with glare and bright objects
3. whatever CA is there, it's correctable
4. the 100mm/f2 has less CA but not as nice bokeh

Mick

1. true. Larger sensor, less CA artefacts
2. yes, in high contrast situations
3. yes, but as said this can have effects on other parts of the image which "share" some magenta/purple colors
4. false, a bit less CA but a comparable bokeh.

My recommendation would be for someone with a limited budget:
- You need a fast & accurate AF in 85mm focal -> 85mm f/1.8 USM
- You prefer longer, with less CA -> 100mm f/2 USM
- You prefer a f/1.4 aperture and don't mind if it's manual focus -> Samyang or Rokinon 85mm f/1.4
- You are not so budget limited -> Sigma 85mm f/1.4

All these lenses are excellent so choose which is better for you and don't forget to shoot photos!

Titi


Canon 5D MkII + Sony A7 + 24x36 & 6x6 B&W film cameras .
CV 15 4.5 III | TS-E 24L II | FE 28 2 | (50+85) 1.4 | 135 2 | 70-200 4.0L | a collection of old Zuikos + FD + Adaptall + AI-s + M42

  
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85mm/1.8 on 6D----- CA, how bad?
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