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Photography Question 
Karthik M. Siddhun
BetterPhoto Member Since: 4/19/2005
 

difference between Wide Vs Ultrawide lens?


I have 2 questions ( I am a bit confused with).
1.May I know the difference between wide Vs Ultrawide lens?

2.When the camera is kept in AF mode, shall we do control zooming maually, Does it harm the camera AF function (internally...parts..ext..,)? The camera ( Canon EOS 66/3000N) manual doesn't say about this.

Thanks in advance.

With regards,
Siddhun


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5/18/2005 11:34:21 PM

 
Andrew Laverghetta
BetterPhoto Member Since: 9/13/2004
  1. I think this part is somewhat up to you but this is how I see it. Wide is 28mm-35mm and ultra wide is anything wider than 28mm, including 24mm, 20mm, 17mm, 15mm etc. 24mm might be considered wide though and not ultrawide. Not sure what other people think though.

2. If you are just zooming while AF is on, you shouldn't have a problem. If you are talking about fine-tuning the focus and manually focusing the lense when in AF mode, this is not good for the lens unless you have a special "USM" lens. This allows you to focus manually while in AF mode. Some lenses might even lock to manual focus when they are in AF mode. I used a 75mm-300mm Quantaray that did this. Hope this helps!


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5/18/2005 11:58:53 PM

 
Karthik M. Siddhun
BetterPhoto Member Since: 4/19/2005
  Thank You, Andrew, I got it.

Yeah,I do sometimes "fine-tune" when AF is on. Just Common sense triggered me to hold on.I have to stop it.

-Siddhun


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5/19/2005 12:31:18 AM

 
Kevin Ekstrom
BetterPhoto Member Since: 5/20/2005
  You shouldnt have to fine tune your lens when your in auto focus. Unless your cameras metering needs recalibrated.
My Nikon N70 is spot on when in autofocus. If your having a problem and you feel you need to fine tune perhaps you should have your camera checked.


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5/20/2005 3:18:03 AM

 
Karthik M. Siddhun
BetterPhoto Member Since: 4/19/2005
  Kevin,
My Camera Autofocus is really good. There is no problem in it. ( camera is a new one.) My only worry is sometimes, when I tune "Polarizer", the fine-tuner also changes its position which inturn makes me to again focus the subject.

I bought polarizer recently. I have to practice, a lot it seems for tuning it.

Even today morning a fresh flower attracted me, took the shot ( w/o polarizer). AF worked pretty well.

( I will post them after 4-5 days, once the roll ends up! I hope so, that might have come nice.)

Thanks Kevin.

-Siddhun
-Siddhun


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5/20/2005 3:29:20 AM

 
Andrew Laverghetta
BetterPhoto Member Since: 9/13/2004
  I suspect that he is fine tuning because something might move a little bit. Sometimes if you're in low light and shooting at a large aperture, you're focus might not always be correct the first time and it takes too much time to recompose. This is why Canon and other brands make "USM" type lenses. He is correct for wanting the ability to fine tune after auto focus works. Sometimes it just takes too long to manually select the focus point yourself. I know with my Canon EOS 20D there are so many different auto focus points that sometimes it selects the wrong one unless I select the focus point myself. That is why I like the USM because you can fine tune.

I'm working on getting a lens that I'm making sure is USM because the front doesn't move on these types of lenses. You can focus without moving your hands all the way to the end of the lense, you can focus just as if you were zooming the lens.


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5/20/2005 2:01:31 PM

 
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