Question about Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens

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Focus with polarizing filter

When I use a linear polarizing filter on my 70-300 DO lens, it cannot be made to focus. I don't mean it has trouble focussing on Auto, I mean even on Manual it cannot be focussed. Probelm disappears when using a circular polarizing filter. Obviously, that's the fix, but is the problem related to the Diffractive Optics lens' physical structure? Just curious. Very pleased with lens sharpness and performance otherwise. The perfect travel lens.

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  • Canon Master
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No, the problem is not with the lens. Your Canon camera requires unpolarized light to focus. Even on manual focus, you may have trouble seeing focus through the viewfinder. That's why they invented circular polarizer.

Posted on Jan 20, 2010

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1 Answer

My quantaray polarizer won't unscrew from the lens. How to remove?


First, make sure you're trying to turn the half closest to the lens. Polarizer filters are designed to turn freely; one half screws onto the lens and then the other half turns free.

Second, don't force it. If you think something's about to break, STOP!

If you can't unscrew the half closest to the lens, try putting a rubber band on it. Wrap the rubber band around that portion of the filter to give you a better grip, then try turning it.

If you have a jar opener, try using that.

A good camera store will sell filter wrenches. One of them should be able to remove the filter. Or take your lens to the store and have someone there remove it with their filter wrench.

Jan 09, 2014 | Quantaray 77mm Linear Polarizer Filter...

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Will polaroid 52mm lens filters fit my panasonic fz45 camera


Your FZ45 accepts 52mm filters. You can use any 52mm filters you wish on this lens.

There are two types of polarizing filters: linear and circular. The linear polarizing filters are for film cameras and *some* digital cameras. Circular polarizing filters are needed by many digital cameras because the linear polarizing filter types interfere with the autofocus programs. If you shoot in manual focus modes only, it won't matter which you buy. If you do use autofocus, you ought to try the linear before buying - otherwise, purchase the circular polarizer.

I hope this helps! If it did, please rate my reply "4 thumbs up". Thanks!

Aug 01, 2011 | Cameras

1 Answer

THE AF AND MF ON THE LENS MEANS WHAT


AF=Auto Focus. With an autofusu capable body, the camera will automatically focus for you using preset focusing zone. Move the Switch to:
MF and it becomes a manual focus lens, where the photographer has to manually focus on his subject.

Nov 18, 2010 | Cameras

1 Answer

Hi there i have a auto focus problem. i used mt 50D for the first time on saturday, after about 100 shots Err99 appeared, i turned the camera off and took the battery out an the error message never occured...


The camera is having problems with your lens and this is why it goues into the error mode. Try first cleaning the interface contacts on the lens ( see enclosed pic ) . If this does not sort the problem out then the auto focus motor ( or related hardware ) inside the lens will need attention. Also try other lenses to see whether it is only the lens ( I very seldom see this sort of problem cause by the body ; it is always the lens that gives this sort of trouble )db49ae2.jpg

Nov 04, 2008 | Canon Cameras

1 Answer

Auto focus will not focus. lens problem or camera problem?


A dirty filter, front, or rear optic can cause the lens to seek

Feb 03, 2008 | Minolta Maxxum 300si 35mm SLR Camera

1 Answer

How many pics can you take with a digital camera? After 1200-1500 pictures my C2500L says funny then using the autofocus. It's still working fine, but I'm a bit worried about it. And what about...


Take a look at this discussion of shutter lifepsan. http://www.dphoto.us/forum/archive/index.php/t- 4531.html To summarize these posts, average number of cycles (one instance of open and close shutter) is somewhere between 50,000 and 150,000 cylcles. As one poster pointed out, we seem to take more pictures with digital than with film cameras, so a hundred thousand cylces might not be that many. I have a c2500L bought used at online auction and have probably taken about 1500 pics so far. Don't know how much previous owner used it. It's amazing how many pictures you take when you don't need to spend money on film and processing! The c2500L is a really nice camera and I hope that mine lasts many years. My c2500L is an early one with version 1.0 firmware (later models have version 1.20 sticker on side) and was built in about 1999 I think. As for autofocus, mine works great as long as I have the focus mode (regular, macro, super macro) and zoom level set correctly for my distance to subject. Fortunately, the green focus indicator lamp near viewfinder flashes when focus isn't right. A few other thoughts on focus: taking picture through glass, in mirror, or scene with no contrast (like a solid grey sky) might require you to use the manual focus or focus lock modes. Window glass fools camera, which tries to focus on glass instead of your desired subject. For mirror, you need to double the normal focus distance (measure distance from camera to mirror, focus on something twice as far, then lock focus and take your pic in mirror). With SLR film camera, mirrors and glass don't cause trouble because you are focusing manually. One other note on fuzzy or dark corners on pictures: if you use filters, especially a thick filter like a polarizer, you should probably get a 43mm to 46mm adapter and use bigger filter. At widest angle zoom, my polarizer causes vignetting in corners because the filter actually is "seen" by lens in corner of pics. Oops, I should have thought of that before buying filters I guess. Hope this helps some.

Sep 06, 2005 | Olympus Camedia C-2500L Digital Camera

1 Answer

Type of polarizer


A 58mm circular polarizer is recommended. Linear polarizers cannot be used. Linear polarizers will effect image exposure and auto focus.

Sep 04, 2005 | Olympus Camedia C-8080 Wide Zoom Digital...

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