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Image stabilizer's

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LisaRose
LisaRose  7172 forum posts United States4 Constructive Critique Points
20 Jan 2007 - 12:14 AM

I just recently purchased a canon (70-300mm)telephoto lens with an image stabilizer. My pictures are coming out soft and often blurry. I thought that the point of having a stabilizer was so you wouldn't have to use a tripod, but the camera could be hand held. Maybe I am wrong...any advice would be greatly appreciated.

Lisa

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20 Jan 2007 - 12:14 AM

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andytvcams
andytvcams  1110396 forum posts United Kingdom
20 Jan 2007 - 12:17 AM

Have you got it switched on!

jellylegs
jellylegs  1059 forum posts Ireland
20 Jan 2007 - 12:33 AM

Andy! Be nice.

Lisa. I know on the 100-400 there are 2 IS modes....
1 - for subjects that aren't moving
2 - for panning with a moving subject
.....might be the same.

IS will give you a few extra stops, but if your shooting wildlife in shade or something, then ISO will have to be bumped up also to shorten shutter speeds.

Also depends on your AF system....might be in AI Servo & be loosing your subject......

Just guesing here. Hope you get some help out of this.

Trevor.

Helpful Post! This post was flagged as helpful
croberts
croberts  102160 forum posts Ireland8 Constructive Critique Points
20 Jan 2007 - 12:35 AM

dont forget, there really is no substitute for a tripod if you need one. IS at best gives you about 3 stops advantage.

ie. if you have a 300mm lens, then remember the 1/focal length "rule"

so........ 1/350, minus 3 stops = 1/45 sec or there abouts. less than that, and its likely to be shakey.

Helpful Post! This post was flagged as helpful
bmh1
bmh1 e2 Member 8571 forum postsbmh1 vcard United Kingdom1 Constructive Critique Points
20 Jan 2007 - 12:37 AM

The IS reduces the effect of camera shake by 2 (older lenses) or 3 stops (latest models), so for the long end of the lens being an equivalent of 480mm (300*1.6), without IS you would need a shutter speed of 1/480s or faster, with IS you should be able to go down to 1/120s or 1/60s, at the short end you might be able to go down to 1/30s or 1/15s.

Of course these are only a guidline, it depends on how steady you are (windy day, stable ground, good stance, caffeine intake etc. could all affect this).

Bernard

EDIT: *Three* overlaping answers, and I'm the slowest typing ...

LisaRose
LisaRose  7172 forum posts United States4 Constructive Critique Points
20 Jan 2007 - 2:29 AM

Thank you..lots of good information. I still have so much to learn! Smile

Lisa

P.S. Yes, I did have it switched on...sheesh Andy. Smile

User_Removed
20 Jan 2007 - 12:22 PM


Quote: I thought that the point of having a stabilizer was so you wouldn't have to use a tripod, but the camera could be hand held.

Doesn't remove the need to be aware of your choice of shutter speed...

Mark_Readman
20 Jan 2007 - 12:26 PM

you have to hold the shutter button halfway down for approximately a second before it starts to work

User_Removed
20 Jan 2007 - 12:46 PM


Quote: You have to hold the shutter button halfway down for approximately a second before it starts to work

Does that mean it could still be adjusting, if the shutter button is pressed straight down.
Or does is disable it.
I'll read up on it, because i need to know to use the 24-105 mm IS. I thought that all i needed to know, was to switch it off when using a tripod.
Col

Mark_Readman
20 Jan 2007 - 12:49 PM

the is will blur the picture if you press it straight down, press halfway and watch the view finder until the picture steadies then fire, its only for use when you can not get the shot without it and is best left off as a default setting.

User_Removed
20 Jan 2007 - 12:59 PM

Thanks Mark.
Col

User_Removed
20 Jan 2007 - 1:10 PM


Quote: You have to hold the shutter button halfway down for approximately a second before it starts to work

???? In the meantime, the shot's gone...

Technology eh!

Smile

Carabosse
Carabosse e2 Member 1139392 forum postsCarabosse vcard England269 Constructive Critique Points
20 Jan 2007 - 1:50 PM

I moved from using only IS lenses to only non-IS lenses. I really thought I would miss the stabilisation...... but I don't!

User_Removed
20 Jan 2007 - 4:31 PM

Never got into it CB.

I'm sure there's a justification for it somewhere, but I worked on improving my skills with a standard fast lens - and put the money elsewhere.

billip
billip  9388 forum posts United Kingdom
21 Jan 2007 - 10:51 AM

A question to bmh, or at least on bmh's post. I never realised the focal length rule needed to be adjusted to take account of the "digital crop" effect of the smaller sensor. Could you confirm this is the case, so I can amend my technique ?!

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