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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 08 Apr 2015 (Wednesday) 23:40
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300mm F/4L is so SLOW!

 
Markd102
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Apr 08, 2015 23:40 |  #1

I love the IQ, the focal length and the weight of the 300 f4L

But what is it that makes it slow down the fps so much?




  
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juckerz
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Post edited over 3 years ago by juckerz. (2 edits in all)
     
Apr 09, 2015 00:04 |  #2

>>I love the IQ, the focal length and the weight of the 300 f4L
>>But what is it that makes it slow down the fps so much?

Nothing. Slow CF/SD card, high ISO, or some other camera setting is doing it.

This is a fast-focusing lens. Nothing about the lens itself can slow down your FPS unless it is not hitting focus,, which should be obvious from the photos you have taken.


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Markd102
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Apr 09, 2015 00:24 |  #3

Focus is fast and true, it's the frames per second that slows.

On both my 7D and 7DII, with the 70-200 I get what I'm assuming is maximum burst rate.
But as soon as I put the 300 on either camera, it slows down by about 3 to 4 fps.




  
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juckerz
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Apr 09, 2015 01:01 as a reply to  @ Markd102's post |  #4

That's a new one on me,, is it under warranty? Please post solution here if you find one.


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DreDaze
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Apr 09, 2015 02:02 |  #5

that really doesn't seem right...just to help narrow it down more, is it the IS or non IS version?


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Apr 09, 2015 07:20 |  #6

Some older lenses will slow down in AI Servo. I wouldn't expect the 300mm f/4 to be one of them though.

Try shooting in One Shot AF or also wide open at f/4 and see if that makes a difference.


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Markd102
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Apr 09, 2015 23:42 |  #7

It's the IS version. Turning off IS "maybe" sped things up a bit....... hard to tell.

I only shoot wide open for football. Oneshot made no difference.




  
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cristphoto
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Apr 10, 2015 08:48 |  #8

Does it shoot at normal speed when you turn AF off?


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koala ­ yummies
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Apr 10, 2015 09:51 |  #9

Yes, turn off AF and then do a burst to test. Edit: also shoot wide open at f/4 with IS turned off.

The 300mm f/4 L IS is one of several lenses that has mention in a couple of the high end (1-series) manuals with regards to drive speed. For example on the 1DX the only way the 300 f/4L IS achieves 12 fps is with AF set to one-shot and image stabilizer turned off (bottom of page 111). I remember other mentions of the drive speed affects, the version 1 of the 100-400 L was almost always mentioned along side it though.

Also significantly stopping down the aperture on some lenses slows down the drive speed even further (I forget where I read the amount but I want to say it was over one-stop for some lenses). For example if doing slow shutter speed panning at a racetrack on a bright sunny day and requiring a small aperture on some lenses it will slow down the drive speed even more. The 300mm f/4L IS was listed as one of those slower-to-stop-down lenses.

I notice mine being much slower when stopping down a lot, and or using AI Servo or IS. Noticeably slower than 70-200mm f/2.8L IS II and 400mm f/5.6.


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CyberDyneSystems
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Apr 11, 2015 20:01 |  #10

Yes, this is "not normal" behavior.


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Nimitx
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Sep 10, 2017 18:02 |  #11

Reviving this old thread because I just experienced this today -- had my 300mm f/4L IS on my 1D Mark IV; getting 3-4 FPS; when I swapped to my 70-200mm, getting normal FPS.

OP, did you ever figure out what the issue was? Thanks!




  
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Sep 10, 2017 23:37 as a reply to  @ Nimitx's post |  #12

I have noticed that mine focuses faster when I turn the IS off, but I wouldn't call it slow by any means. With IS off, it's as fast as any lens I've photographed with.


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Sep 26, 2017 20:09 |  #13

I had this problem on my 7d II, but it's fine on my 1d mark III. It's doesn't slow down too much but it defiantly not at the full 10 fps.




  
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umphotography
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Sep 26, 2017 21:21 |  #14

the 300's I have used have been very fast...what card are you using


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PJJ205
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Sep 26, 2017 22:44 |  #15

Check your focus limiter on the lens and focus priority settings in the camera. With the 300, if you're in between ranges of the limiter on the lens, your camera struggles to focus and wont fire off frames right if you've changed your focus priority in the camera body.




  
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300mm F/4L is so SLOW!
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