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08/26/2004 01:35:05 AM · #1 |
Just bought this lens yesterday. Just curious as to the use of the IS:
Do you leave it on all the time, or only in low light?
What about for the upper end of the zoom? On or off?
It seems to make a little noise when it is on. Is this normal?
Does the IS drain the battery in my DRebel? If so, does it make a huge difference?
Thanks in advance for any help.
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08/26/2004 01:44:39 AM · #2 |
I love my 28-135 IS. I find it to be an excellent general purpose lens, and I keep it mounted as my 'default' lens.
I leave the IS on when doing handheld shots, and always turn it off when the camera is mounted on a tripod. The IS can degrade the image quality (introducing vibration-induced blurring) if it is left turned on when the camera is tripod-mounted. Remembering to turn it off can be quite a nuisance until you get into the habit - at least if you're an old dog like me.
Yes, the the noise is normal.
Yes, it does increase battery drain somewhat.
Message edited by author 2004-08-26 01:45:10.
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08/26/2004 02:07:35 AM · #3 |
Good choice of lens.
IS really drains the battery, so I only use when hand-holding in the 'shake zone' i.e. below 1/150 at 135mm and below 1/60 at 28mm.
Don't use it when tripod mounting as it usually messes up.
Monopod work seems to be OK both on and off...
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08/26/2004 02:20:03 AM · #4 |
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08/26/2004 02:39:00 AM · #5 |
Originally posted by darcy:
can i ask, what is IS? |
It's Canon's acronym designation for Image Stabilization. There's a little gyro element in the lens that counteracts your shaky hands. =]
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08/26/2004 02:42:22 AM · #6 |
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08/26/2004 05:27:33 AM · #7 |
I leave IS off on my 28-135 unless I feel need it.
:)atwl
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08/26/2004 07:58:47 AM · #8 |
Originally posted by darcy:
can i ask, what is IS? |
For a good introduction, complete with animation, check out this link.
Originally posted by mariomel:
Do you leave it on all the time, or only in low light? |
I leave IS on on my 70-200 all the time. I believe that on the 28-135 you need to turn IS off when using it on a tripod.
Originally posted by mariomel:
Does the IS drain the battery in my DRebel? If so, does it make a huge difference? |
Yes, it does take some power from the camera to move the floating lens element. However, I have not noticed it making a "huge difference" compared to when I use my non-IS lenses. |
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08/26/2004 08:50:53 AM · #9 |
I have the 28-135 IS as well.
You should turn off the IS when the camera is on a tripod. Basically the control system that commands the IS actuators goes into a state where it is trying to cancel out the system noise and the system can go nuts. Think about holding an mic pointed at the speaker it's connected to.
I usually leave it on otherwise, but it's probably not necessary with high shutter speeds.
I have not noticed a significant additional drain on the battery. The IS sysytem will certainly consume some power, but I have shot all day with it on and have not had any problems.
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08/26/2004 09:47:18 AM · #10 |
Thanks for the replies.
I have one last question: How many stops lower will the IS let you go?
1/30? 1/15? instead of 1/60th.
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08/26/2004 10:10:31 AM · #11 |
Originally posted by mariomel:
Thanks for the replies.
I have one last question: How many stops lower will the IS let you go?
1/30? 1/15? instead of 1/60th. |
Largely that depends on the focal length you are shooting at. The longer the focal length, the faster the minimum shutter speed typically necessary. Usually, the guideline without IS is that the slowest shutterspeed should be 1/EFL. (EFL = Effective Focal Length = Focal Length * Crop Factor)
This is largely dependent on how steady you hold the camera and how much blur you can tolerate in the final image.
I have gotten acceptable results with the lens at 135mm and shooting a 1/20s - 1/30s, but I was using the strap like a rifle sling to steady the camera and I am usually pretty steady to begin with. There was some blur in the fine details, but nothing I found objectional until the image was enlarged quite a bit.
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08/26/2004 10:19:35 AM · #12 |
Thanks Dan.
Enough theory. I think I'll go out and shoot some pics now.
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08/26/2004 10:23:51 AM · #13 |
Originally posted by Spazmo99:
I have gotten acceptable results with the lens at 135mm and shooting a 1/20s - 1/30s, but I was using the strap like a rifle sling to steady the camera and I am usually pretty steady to begin with. There was some blur in the fine details, but nothing I found objectional until the image was enlarged quite a bit. |
It is remarkably good. I think 1/20s or so is starting to push your luck at the 100mm end or beyond. In general though, you get about 2-3 stops better handholding speed than you could without IS. So at 100mm you'd normally need to shoot around 1/125s and with IS you can shoot at between 1/30s or 1/15s
Essentially, you can shoot at 1/((focal length*1.6)/3) instead of 1/(focal length*1.6)
1/20s at 100mm, f5.6, ISO 400, handheld, with the 28-135IS
(Did I mention I went to Seattle at the weekend...)
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08/26/2004 08:22:38 PM · #14 |
Originally posted by Gordon:
Originally posted by Spazmo99:
I have gotten acceptable results with the lens at 135mm and shooting a 1/20s - 1/30s, but I was using the strap like a rifle sling to steady the camera and I am usually pretty steady to begin with. There was some blur in the fine details, but nothing I found objectional until the image was enlarged quite a bit. |
It is remarkably good. I think 1/20s or so is starting to push your luck at the 100mm end or beyond. In general though, you get about 2-3 stops better handholding speed than you could without IS. So at 100mm you'd normally need to shoot around 1/125s and with IS you can shoot at between 1/30s or 1/15s
Essentially, you can shoot at 1/((focal length*1.6)/3) instead of 1/(focal length*1.6)
1/20s at 100mm, f5.6, ISO 400, handheld, with the 28-135IS |
It does start to get a bit iffy slower than 1/20s beyond 100mm.
Originally posted by Gordon:
(Did I mention I went to Seattle at the weekend...)
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Yes, you did mention it and you showed some fine shots of it as well. |
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