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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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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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...

1 Answer

I can't get the lens to focus at all on any close up setting manual or auto. I have been trying to take pictures of flowers and insects with it set to close up and I have tried also with it on manual...


The 70-300mm lens won't focus closer than about 5 feet (1.5 meters). If you need to get closer, there are several alternatives. Here are some in descending order of cost (and picture quality).

A special "macro" or "micro" lens. Some lenses are designed to focus closer than others.

Extension tubes. These are tubes that fit between the lens and the camera body. By putting more distance between the camera and the lens, the focus point moves closer to the camera.

Close-up lenses. These are like filters in that they screw onto the front of the lens, but act like a magnifying glass.

Sep 04, 2011 | Nikon AF 70-300mm f/4-5.6 ED Nikkor Lens

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 | Camera Lenses

1 Answer

Did the sigma 75-300 dl will work with nikon d300?...i mean the auto focus and matrix focus


Yes. The D300 has a focus motor built into the body and thus does not need one in the lens. The lens will also meter properly with the D300.

Aug 10, 2010 | Sigma 75-300mm f/4-5.6 DL Lens for Nikon...

2 Answers

My 50 mm 1.4 won't focus on closer objects only far away now after my mom dropped my camera. What can be done? Is it most likely broken?


yes thats a fair bet,,, it could only be the lens that took the brunt of the smack it had and its now jamming when you try to focus up on close ups,,,
try a difrent 50mm lens on it and find out if im right

Oct 17, 2009 | Canon Normal EF 50mm f/1.4 USM Autofocus...

1 Answer

How do you use the manual focus feature. My friend just bought a new one and is having trouble with this part of the lens. I have one for my canon and there is a setting for it


Set either the camera or lens (or both) to manual focus. Most Nikon cameras have the focus selector switch on the front, under the lens release button.

Look through the viewfinder and turn the focus ring until the image (or at least the subject) appears sharp. A green light will light up when the camera thinks the subject under the currently selected focus sensor is sharp.

Sep 18, 2009 | Sigma 150mm f/2.8 EX APO Macro DG HSM for...

1 Answer

Lens will not auto focus any more.


Hi there!

I experienced the exact same problem with my 100-300mm lens and I was never able to get it to work correctly again. In fact, attempting to use it further seemed to exacerbate the problem.

The further you zoom, the wider the aperture opens allowing more light for the camera to focus properly. If the aperture mechanism is damaged, the auto-focus process may not work as it should; which would explain why the auto-focus feature works only when at 18mm.

Regardless, I strongly recommend you discontinue use of the lens until a professional technician can examine the lens and figure out what's going on. I'm sure you can contact the manufacturer to open a support case or you can find a camera store that offers repair services.

I hope this helps!

Aug 29, 2009 | Nikon Nikkor 18-135mm f/3.5-5.6G ED-IF...

1 Answer

My camera lense will not focus automatically or manually.


There is no battery in the lens.  The lens receives power from the camera. Whether or not the lens is getting power, though, you should be able to focus manually.
When you say you can't focus manually, do you mean that you can't turn the focusing ring on the lens, or that when you turn the ring the image does not come into focus?
If you decide the lens needs to be repaired, I recommend sending it to Canon.  You can go to their website (canonusa.com if you're in the US), click on support, and follow the links.

Dec 20, 2008 | Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens

2 Answers

Trouble focusing with sigma 70-300 DL macro super lens


It will not focus on anything closer than 5 feet.

(From Sigma lens literature)
Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. It also has a switch for changeover to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing distance is 1.5m / 59 in. at all zoom settings.

Dec 25, 2007 | Sigma AF 70-300mm f/4.0-5.6 DL Macro Super...

2 Answers

AF problem with Quantaray 2X adapter


How does it stop working? Do you mean it doesn't auto focus anymore?
Many longer focal length lenses wont auto focus with 2x teleconverters on them.

Nov 27, 2007 | Quantaray 100-300mm F4.5-6.7 Zoom lens for...

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