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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Apr 2009 (Thursday) 00:38
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Which would you rather have on your lens 2.8 or f/4 IS

 
mobileman
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Apr 23, 2009 06:46 |  #16

Really don't need IS lens as I always shoot from a tripod. I would for sure take the 2.8 over the f4 . The additional weight means nothing to me. I wish I had a prime 500 2.8 but could not afford it anyway if they did make it.




  
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sandpiper
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Apr 23, 2009 07:05 as a reply to  @ post 7787140 |  #17

It all depends on what you are planning to shoot.

If trying to photograph kids, animals or other fast moving subjects then you need the faster lens, as IS won't help at all.

If trying to capture static subjects in relatively low lighting, at an indoor car show for example, then IS every time. There is only one stop advantage between 2.8 and 4.0, but IS can give a four stop advantage, allowing you to handhold at much slower shutter speeds. Great when the subject isn't moving.

If you want very shallow DoF, then again go for the faster lens.

With zooms, I have gone for IS every time, as they are much more versatile. I don't feel that the one stop aperture advantage, of f/2.8 over f/4, is enough to counterbalance the amount of use I get from the IS when shooting static objects. I can take shots with the 24-105L that the 24-70L couldn't attempt, because of that four-stop IS.

However, I still need something fast to be able to shoot moving targets in low light so I have fast primes for that purpose, as they give an even better advantage. My f/1.8 primes being another stop and a third faster than a f/2.8 zoom, with a 300 f/2.8L IS doing low-light duty at the longer end when my 100-400L IS runs out of light two stops earlier.

My preference would always be an IS zoom, backed up with a fast prime, for the best of both worlds. To me, an f/2.8 (non-IS) zoom is a compromise that can't match the hand-holdability of an f/4 IS, or the speed of an f/1.8 prime. It does however, perform reasonably at both tasks, as you would expect from a compromise. If you don't need to be able to hand hold at 1/6 second or need f/1.8 to get suffiicient shutter speed at high ISOs, then the compromise will probably suit you well.

It depends on what you need the lens to do. Many will prefer f/2.8 and many will prefer f/4 IS, but they will be using them to suit their needs, which may not be the same as yours. You should decide what you want / need from a lens and then buy accordingly, rather than relying on the choices of others.




  
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vuthuyduong
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Apr 23, 2009 07:29 |  #18

Rumours run that F/4L IS is sharper but I have not got a chance to test it yet.


Rebel XTi, 28mm f/1.8, 85mm f/1.8
Dreaming of 70-200mm f/2.8L

  
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bohdank
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Apr 23, 2009 07:35 |  #19

I think that often things look better on paper then in real use.

Low light, moving subjects, very fast primes used wide open shot at distances where DOF is paper thin. How many shots are actually in focus ? I would guess next to none.


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magnum703
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Apr 23, 2009 12:29 |  #20

Im in this situation where I want to sell my 70-200 F4 IS and get a F2.8 IS!!! I love the bokeh more and the 2.8...... plus I can put a 2x converter in for wildlife! I know it isn't as sharp as the 100-400 tho....


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RPCrowe
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Apr 23, 2009 12:33 |  #21

I agree with Ed

ed rader wrote in post #7786325 (external link)
depends on the lens.

i have the 24-70L instead of the 24-105L.

i have the 70-200L f4 IS instead of the 70-200L f2.8.

ed rader

I have the same lenses but, I use my 24-70L mostly for studio work and use my 17-55mm f/3.8 IS for outdoor and travel shooting.


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Bill ­ Roberts
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Apr 23, 2009 12:38 |  #22

Henrik K Kristensen wrote in post #7786764 (external link)
F/4 IS for zooms.... primes for fast lenses

Keeps weight down and different lenses for different purposes, but that is just me :-)

Actually that pretty much sums it up for me too.


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superdorf
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Apr 23, 2009 13:13 |  #23

What if you have basically no good glass, and can only buy ONE lens. 70-200 f2.8 or f4 w/IS?

Realizing that faster primes added to the mix would be better... So if you can only choose between the f4 IS or the 2.8 non-is...which would you choose?




  
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Kruzkal
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Apr 23, 2009 13:16 |  #24

If I can only have either then f/2.8 for wide to short teles and f/4 IS for longer teles.




  
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bohdank
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Apr 23, 2009 13:34 |  #25

superdorf wrote in post #7789242 (external link)
What if you have basically no good glass, and can only buy ONE lens. 70-200 f2.8 or f4 w/IS?

Realizing that faster primes added to the mix would be better... So if you can only choose between the f4 IS or the 2.8 non-is...which would you choose?

My decision is in my list below. It was the first lens I bought. Weight and size was a consideration. If I had the f2.8, it would spend most of it's time at home, I think.


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NYC2BGI
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Apr 23, 2009 14:15 |  #26

Good question but I think that I prefer the f2.8. I had a slower lens (17-85) with IS and sold it since most of my shooting is indoors. I kept my 70-200 f4 since I only use it outside. All of my other lenses are f2.8 or faster.


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Subimatt
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Apr 23, 2009 14:18 |  #27

2.8 or bust for me.


5D2 x3,5Dc,60D,40D,16-35LII,24-70L,70-200L 2.8IS,15 FE,24LII,35L,45TSE,50Lx2,85LII,100L Macro,135L,580exII x5
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dalto
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Apr 23, 2009 14:20 |  #28

I find that photographing people indoors in low light f/4 IS is not an ideal solution because of hit or miss autofocus. I get much more consistency in this situation with 2.8.

However, for me, the best solution for my overall shooting is still to use my 24-105 f/4 and just to use a 50mm prime lens when the situation warrants it.




  
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CyberDyneSystems
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Apr 23, 2009 14:32 |  #29

Depends on application,..
If low light and moving subject, then f/2.8


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snowshark13
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Apr 23, 2009 14:33 |  #30

f/4 with my 50 1.4 prime for lowlight. :D

Personally, I'm looking at the 24-105 f/4 for everyday since 95% of my shots are in that range. I have the 50 1.4 for bokeh and low light. My UWA and Telezoom will be variable (canon 10-22 and 100-400). Now I just have to save up for my glass! :D

Now, I do most of my shooting outdoors and in well lit environments, so these ranges and speed work really well for me. :D


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Which would you rather have on your lens 2.8 or f/4 IS
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