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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 26 Jan 2013 (Saturday) 08:20
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100-400 dust pump .........

 
whu-1
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Jan 26, 2013 08:20 |  #1

hi guys ..............100-400 l how much of a " dust pump " is it , going to use it in fine dust environment as well as beach ..........was looking at 70-300 l but is a little short ......
:lol:


newbie question as well :oops: is the lens fast enough to cope with focusing on a man moving at 20 m/h at the beach 1 hour before dusk moving directly towards you at 300mm ?
cheers :cool:




  
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BrandonSi
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Jan 26, 2013 08:29 |  #2

I used the one I had in Kenya, and it was very dusty / dirty off-road. Never had a problem with dust, except on the sensor.

I would imagine the 100-400L could keep up with that, the question would be if your camera could handle it or not. 1Dx/1Div/5D3 and probably 7D could do it.. anything else and I think your camera is going to be the weak point.


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effstop
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Jan 26, 2013 09:19 |  #3

I had one a few years ago that was used mostly at the beach and didn't run into any dust issues. Great lens and wish I would have kept it.


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jcpoulin
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Jan 26, 2013 09:34 |  #4

Throw on a uv filter for the sand. Great lens. Agree w Brendon.... Your body may be the limiting factor


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Scott ­ M
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Jan 26, 2013 10:26 |  #5

jcpoulin wrote in post #15535853 (external link)
Throw on a uv filter for the sand. Great lens. Agree w Brendon.... Your body may be the limiting factor

I would advise against a UV filter for this lens. The 100-400L is notorious for having image quality issues with filters attached.

It's a terrific lens, though. I agree with an earlier post where your body would be more the limiting factor for auto focus. The 100-400L focuses quick enough for birds in flight on both my 5D3 and 7D.


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Snydremark
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Jan 26, 2013 10:39 |  #6

The name is an exaggeration; I've been using one in all kinds of environments for 3 years and never had a problem with dust accumulation.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
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jcpoulin
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Jan 26, 2013 10:40 |  #7

sorry...disagree.....t​he beach is the only time I will use a UV filter.... nothing like sandblasting the front element. Perhaps just makes me feel better :) On real windy days at the beach, I also put my rain sleeve on the lens...call me paranoid!


1DX , 7D,16-35, 24-70 2.8II, 2.8L II, , 70-200 f2.8LII IS, 300 f2.8L IS, 500 f4 IS, 100-400L, Canon 100 2.8 macro, Canon 1.4X, 580ex, AB800X4
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whu-1
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Jan 26, 2013 11:42 |  #8

body 60d , cant see me upgrading :) unless next upgrade a huge jump ...rather buy a lens :)
all ways us uv fitter more for protection from scratches etc .........
thanks for the answers ............
if they release a new 100-400 what you think the price would be $2250 ?




  
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ed ­ rader
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Jan 26, 2013 12:54 |  #9

whu-1 wrote in post #15535673 (external link)
hi guys ..............100-400 l how much of a " dust pump " is it , going to use it in fine dust environment as well as beach ..........was looking at 70-300 l but is a little short ......
:lol:

newbie question as well :oops: is the lens fast enough to cope with focusing on a man moving at 20 m/h at the beach 1 hour before dusk moving directly towards you at 300mm ?
cheers :cool:

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pssc
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Jan 26, 2013 13:59 as a reply to  @ ed rader's post |  #10

I remember reading this dust-pump garbage before I bought my 1-4 and was concerned. I also remember some folks saying it was BS, so I was not sure who to believe. I have had my 1-4 for over five years and I will say that I think this dust pump garbage is an eronet myth.I have shot in very dusty, windy conditions. This includes Africa on at least three trips, plus many beach and desert trips. I am usually in Hawaii twice a year including the pipeline masters and other big wave surfing competitions. I do alot of off-roading and you won't find many more dusty conditions.I do not use a UV filter as I have found it does seem to degrade IQ. And yes, I have cleaned my lens many times and wiped off the salt spray/dust/dirt/sand etc without any negative effect on my lens. I always use the hood. YMMV

Cheers, Steve


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Quadna71
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Jan 26, 2013 14:20 |  #11

Don't the "dust pump" comments refer more to pulling dust into the body during lens extension than into the lens itself? It would seem to me that those working with a weather-resistant body may have better luck than others with non-sealed bodies.
(No firsthand experience...just some online supposing)


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TSchrief
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Jan 26, 2013 14:29 |  #12
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My 100-400 is about 18 months old. No visible dust. Should the 17-55 (I don't own one) rightfully be called the dust-twist? Neither moniker makes any sense. ALL zoom lenses move, which means they all suck air, which means that will all get some dust in them under the right circumstances.


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Snydremark
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Jan 26, 2013 14:59 |  #13

Quadna71 wrote in post #15536737 (external link)
Don't the "dust pump" comments refer more to pulling dust into the body during lens extension than into the lens itself? It would seem to me that those working with a weather-resistant body may have better luck than others with non-sealed bodies.
(No firsthand experience...just some online supposing)

Yes, it does...but it's still incorrect. People *believe* that just because the body extends in order to change focal length that it must pull more dust out of the air than an internal zoom, such as the 70-200s. However, the actual mechanism for changing focal length is the movement of the lens element closer/further together, which still happens in any zoom lens. None of these lenses are vacuum-sealed or anything, so there HAS to be air flowing in/out whenever you move those elements around. Any dust small enough to get in one lens can get in the other.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
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BrandonSi
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Jan 26, 2013 15:34 |  #14

ed rader wrote in post #15536469 (external link)
100-400L + 30d

QUOTED IMAGE

Nice shot! I think the issue with AI Servo in the OP's case is the subject moving directly at him.. From what I remember, a lot of non-modern AF systems have trouble detecting the change in distance when the subject moves head on. I think the older ones (as you've shown) are pretty decent and keeping focus on a moving subject (side to side) when distance remains mostly the same.


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ed ­ rader
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Jan 26, 2013 15:41 as a reply to  @ BrandonSi's post |  #15

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5D4, 80d, 16-35L III, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
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100-400 dust pump .........
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