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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 04 Sep 2013 (Wednesday) 19:35
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why people go for the ef 85 f/1.8 instead of the ef 100 f/2

 
dave_bass5
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Sep 05, 2013 12:18 |  #31

tkbslc wrote in post #16270525 (external link)
Purple fringe on the 85mm is the same if you also shoot at f2.0. Shouldn't penalize the 85mm because it opens wider.

Maybe i had a poor copy but i could definitely see a difference when i shot the same scene with both lenses wide open.

For me its a focal length issue. I felt 85 was too close to 50mm, but too long as a walk around lens, whereas 100mm is far enough away from 50mm to make using both worth while, especially if i needed longer reach, and it can cover a bit longer than my 24-70 without having to use my 70-200.
On FF i prefer it to 50mm as a walk around lens.


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Sep 05, 2013 13:28 as a reply to  @ dave_bass5's post |  #32

genjurok wrote in post #16270055 (external link)
I'm on FF. I had 85 f/1.8 ( two copies) and it 's replaced by 100 f/2 now.

Reaon is that I'm a hardcore 50mm lover, therefore 100mm makes more sense than 85mm to complement the 50mm.

The 100 f/2 I have is a great copy. I A/B compared it to two 70-200 IS II copies and they're equally sharp.

I had the 85 & was going to swap to the 100 for that reason ^^^ I found 50 & 85 too close.

In the end though I also sold my Sigma 70-200/2.8 & bought a 135L :lol:


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Sep 05, 2013 14:10 |  #33

I've bought most of my lenses used and it seems like it's easier to find a used 85mm f/1.8 than a used 100mm f/2. Plus I got mine in mint condition with a Canon hood for $250, so that's why I have an 85 instead of the 100.


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tkbslc
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Sep 05, 2013 14:50 |  #34

dave_bass5 wrote in post #16270569 (external link)
Maybe i had a poor copy but i could definitely see a difference when i shot the same scene with both lenses wide open.

That's because wide open on the 85mm is 1/3 stop faster. If you shoot both at f2.0, there is really no difference. So you stop down the 85mm to f2.0 and it's as good as the 100mm at f2, but you can still use that extra 1/3 stop if needed.


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topdslrs
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Sep 05, 2013 14:54 as a reply to  @ tkbslc's post |  #35

I second that
1/3 stop faster
less expensive
lighter


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moltengold
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Sep 05, 2013 15:06 |  #36

Thanks all

there is a small guide from canon for all the canon lenses called ( The EF advantage EF Lenses )
i saw that the ef 85 f/1.8 is for :
indoor sport
Portraits
Products
Weddings
Reportage

and the ef 100 f/2 is for :
indoor sport
Portraits
Weddings
Reportage

i wonder why the ef 100 f/2 is not for products photography ?


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dave_bass5
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Sep 05, 2013 15:10 |  #37

tkbslc wrote in post #16270950 (external link)
That's because wide open on the 85mm is 1/3 stop faster. If you shoot both at f2.0, there is really no difference. So you stop down the 85mm to f2.0 and it's as good as the 100mm at f2, but you can still use that extra 1/3 stop if needed.

Not really, the CA was pretty bad even at f/2.2 + on my 85.
I agree about the obvious 1/3 stop advantage but i dont see that as a real world advantage anyway.
I believe the 100 is also slightly better made, i think it has a metal filter mount compared to the plastic one on the 85 (i could be wrong though, i dont have my 85 any more).


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PH68
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Sep 05, 2013 15:13 |  #38

I had an EF 100 f/2.
Image quality was very sharp, even at f/2.

It does have a metal filter mount.
Purple fringing eventually became annoying to me, so I sold it in the end.


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Sep 05, 2013 16:12 |  #39

The 100mm has less CA (purple fringing) than the 85 1.8 at least based on my experience. (at any aperture compared)

For me it was down to focal length.
I have a 100mm (Macro) and a 135L, and find the 85mm FL to be quite useful.
I'd like to add the 100 f/2, but consider it a bit overkill to justify given all the other ways I can get to 100mm.


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moltengold
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Sep 05, 2013 16:20 |  #40

Thanks a lot


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Sep 05, 2013 21:51 |  #41

I chose the 100/2 because it was the longest, fastest lens I could afford at a time when I only had a 55-250 to shoot sports with. I also had a 50 1.8, so the longer length gave me a more pronounced change of distance.

The 100/2 has been a fantastic all-around lens, but as I save up to move to FF I can't help but to eye the Sigma 85 1.4 and Canon 135L. In a perfect world I would sell the 100/2 and buy them both, but my checking account dictates that the 100/2 a perfect compromise. The AF speed and sharpness make it a very handy piece of glass.


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crunchie
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Sep 07, 2013 10:27 |  #42

Already had 100mm macro, and I use it a fair bit for macro. Didn't want to double up on the focal length, and got a fantastic deal on a second hand 85mm.


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Sep 07, 2013 11:09 |  #43

moltengold wrote in post #16268615 (external link)
why people go for the ef 85 f/1.8 instead of the ef 100 f/2

Well, the depth of field at 85mm and f1.8 is pretty much the same as the depth of field at 100mm and f2, for images framed the same way. So, I think that the reason people prefer one over the other is not DOF, but rather field of view. Those who choose the 85mm probably need the slightly wider field of view that the 85mm offers, while those who choose the 100mm most likely benefit from the slightly narrower field of view - or "reach" - that the extra 15mm gives them.

The difference in possible shutter speeds is negligible, so I don't think that would be the reason 85mm owners chose that option.


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Sep 07, 2013 11:11 |  #44

I think the 85 just makes more sense with a crop camera and that's why there's more of them around.

On FF 100/2 is an easy choice to make.


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spotch
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Sep 07, 2013 11:51 |  #45

fwiw, I'm going to get the 85 because I've got the 35 f2 IS and 100 is a bit more of a jump than I'd like. I'd also like to get the 135L one day, and 35-85-135 seems to be decent spacing. Something else to consider is that on a crop frame, if you're following the 1/focal length rule for avoiding blurry camera-shake type pictures, an 85 means you should shoot around 1/125-1/150, while the 100 will require 1/150-1/200. (Yeah, I know, people with steady hands can get way way better than this, but all else being equal you'd need a faster shutter speed to avoid blurry pics with the 100). This, in addition to the 1/3 stop difference in light input, can result in a noticeable difference in noise if you're shooting indoors on a crop body that's not exactly great with noise to begin with.

Really though, it's all a bunch of 'little stuff' like the above. In reality, they're both great lenses. Close enough in quality/use that I don't really see huge reasons to go one or the other, and close enough that anyone considering one should check and make sure they wouldn't be better-served by the other.




  
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