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 Post subject: Handholding IS Lenses
Unread postPosted: Thu Aug 10, 2006 9:36 am 
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Junior Virtual Ranger
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All,

I have the 300mm F4 IS L and 100-400mm F4-5.6 L IS. The reason I have bought the IS lenses is to help in low light i.e. early morning/early evening photography.

My question is, in 'normal' light at these periods (early morning and early evening), with a mid-toned subject on a maximum ISO of 400 (at say F5.6-f8), what do you think you could handhold your lens down to. (feel free to fill in other conditions)

Everyone is different, we all get the 'shakes' (especially after a night on the beer :lol: :lol: ), but just interested to hear everyone's experience/feedback.


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Unread postPosted: Thu Aug 10, 2006 9:45 am 
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Rule of thumb: maximumshuttertime is 1/[focal length].

In this case it's an IS lens, giving you 2 or 3 stops extra, but I never (well, almost never) take them into account.
But having said that I will happily shoot at 1/125 while at 400mm, knowing the photo will not be razorsharp, but sharp enough for my purposes.

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 Post subject:
Unread postPosted: Thu Aug 10, 2006 9:51 am 
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Hi

Took lots of pictures of birds at camps and picnicspots at
ISO 200 and 400 with shutterspeeds of 250 and higher
With the 100-400 all are sharp

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 Post subject:
Unread postPosted: Thu Aug 10, 2006 9:56 am 
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I agree. I personally dont like shooting below 250 on the 100-400mm IS. I bought the ErgoRest, so am going to test that out at the weekend to get used to it and see what I can go down to.


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 Post subject:
Unread postPosted: Thu Aug 10, 2006 10:03 am 
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Remember that when you shoot with a APS size sensor like 350D or 30D, you need to adjust the rule so that with a 400mm, you need to adjust it as if it were a 640mm, which ties in with delboy's comment about 250th/sec for his 100-400.


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Unread postPosted: Thu Aug 10, 2006 10:20 am 
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True JM-S. I made that mistake on my first day in KNP last november! Putting a 1.4 converter on the 300mm I had a 630mm instead of a 420mm but did not take that into account when setting my shutter speed. A lot of pics came out a bit blurry!

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Unread postPosted: Thu Aug 10, 2006 10:24 am 
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delboysafa wrote:
I agree. I personally dont like shooting below 250 on the 100-400mm IS. I bought the ErgoRest, so am going to test that out at the weekend to get used to it and see what I can go down to.


You should be able to work at shutterspeeds of 30
I always use the cable release

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 Post subject:
Unread postPosted: Thu Aug 10, 2006 11:38 am 
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Will have a bit of fun finding out how low I can go :lol:

I always ensure my shutterspeed is more than the focal length due to the APS sensor of my 20D. However, I also fell into that trap when I first started and was wondering why my images weren't sharp.....

Everyone is different, but I always shoot in TV (Shutterspeed) mode when I am handholding to give me the best chance of getting a sharp picture, especially as I use 200-400mm ranges for the majority of the shots I take. I am using manual a bit more, when conditions allow though.


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Unread postPosted: Thu Aug 10, 2006 3:57 pm 
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One word of caution with the 100-400 and the Ergorest. The IS on this lens is one of the older variety and (apparently) can be upset when the lens is on a firm tripod (rumoured to be even able to damage the system). Newer lenses do not have this problem.

Having said that, I suspect an Ergorest inside a car is not going to be a rock solid tripod, so you may still get some benefit from the IS.

Richard


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 Post subject:
Unread postPosted: Thu Aug 10, 2006 4:08 pm 
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There are two versions of the IS 100-400. The older ones indeed have that problem, the newer ones not.

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 Post subject:
Unread postPosted: Thu Aug 10, 2006 9:06 pm 
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i have the newer one, but I have heard of the IS-tripod issue.

I really like the lens.

Anyone want to give me £4000 + to buy the 600mm IS L :D :D :D


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Unread postPosted: Thu Aug 10, 2006 9:57 pm 
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If only that was enough! In the UK they are nearer £6000!

Richard

ps DQ - when did the newer ones come out. I can't find reference to them. Do they have the new type 3 IS?


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 Post subject:
Unread postPosted: Thu Aug 10, 2006 11:25 pm 
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AFAIK only the version 1 IS lenses like the 300 f/4 IS suffer from the tripod problem. I used to own a 300 f/4 IS and when I put that lense on a tripod I had to turn off IS because if I didn't then the IS would make the viewfinder image move while using the tripod. As soon as I'd start focussing the IS would kick in and the viewfinder image would start to shift to the lower right corner. I now own a 300 f/2.8 IS which afaik has the version 2 IS and that lense is fine on a tripod.


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Unread postPosted: Fri Aug 11, 2006 2:08 am 
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Image Stabilizer
A photograph can easily be ruined when handshake or vibration is introduced during long exposure shots. The Image Stabilizer (IS) counters such problems by optically correcting such shakes with gyro sensors and lens groups that move in relation to the shakes, thus minimising or even eliminating minute vibrations from the image.

A general rule-of-thumb to overcome such vibrations would be to set the shutter speed equal to or faster than the reciprocal of the lens' focal length (e.g. 1/60s for a 50 mm lens). IS lenses can improve on this rule by up to three stops. That is, the same 50 mm lens could be used at 1/8s.

Canon has released several versions of the IS system. The original, first used in 1995's 75-300mm f/4-5.6 IS USM, takes approximately one second to stabilize, provides approximately two stops of stability, is not suitable for use on a tripod (if it cannot detect any motion, it may introduce unwanted motion of its own), and should not be used while panning. The next advance was released with the 300mm f/4L IS USM in 1997 and adds IS mode 2, which is for panning. Mode 2 detects whether panning is taking place horizontally or vertically, and only compensates for vibration in the plane perpendicular to the plan of panning. In 1999, with the release of the IS super-telephoto lenses (300mm f/2.8L IS USM through 600mm f/4L IS USM), tripod detection was added, so that the lens could be used on a tripod with IS enabled. The most recent advance, first found in the 70-200mm f/2.8L IS USM released in 2001, reduces startup time to approximately 0.5s and increases stabilization to three stops. Canon has not ported newer IS versions back to older IS lenses.

http://en.wikipedia.org/wiki/Canon_EF_lens_mount

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 Post subject:
Unread postPosted: Fri Aug 11, 2006 8:33 am 
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Thanks for all the interesting info here guys.

Duco what you doing here at 2am?

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