Canon EF 300mm f/4L IS USM Telephoto Lens for Canon SLR Cameras: Customer Reviews & Product Details

I own the 70-200mm 2.8 IS and didn't have enough reach for birds so I bought the 300mm f4 IS and used it with the 1.4x. I found the images very sharp, but the noise of the IS kicking in is quite noticable and also the focus was slow. My other lens was smooth, quite, and fast compared to the 300, and I was somewhat unhappy about the focus and noise of the lens. Seems like for the price, it would be alot quieter and faster to focus. It does shoot sharp though, and maybe I can live with the other problems..

On a 30D and Digital Rebel XT, I tested this lens against my Canon EF70-200mm F/2.8L USM IS with 1.4x extender, and against the EF70-300mm F/4.5-5.6 USM IS lens. I can honestly say, there is a noticeable sharpness and contrast improvement of the 300mm F/4 USM IS lens over the other two configurations. Bokeh is very good with the 300mm lens. I cannot complain. Would the extra $3K be worth it for the F2.8 300mm lens? Only if you make enough money from this field to pay for it AND make some profit. Otherwise, I'd get this lens to fill the position. Then only if it sees an abundance of work would I consider looking at the bigger brother. Selling this one as used and upgrading later would be more like renting it for a cheap price because it holds it's value.

Back to my comparison: The 70-300mm lens was sharper than the 70-200mm w/1.4x wide open, but the results were reversed when stopping these two combinations down. the 70-200 and the 300mm here have better color than the 70-300 zoom I tested. The issue with the 70-200mm w/1.4 extender is, I was unhappy with the bokeh (background blur) using the extender. I'd hate to see how bad this is with the 2x extender. In my opinion, and I admittedly pixel-peep, but if you are wanting to shoot at 300mm, and find yourself zooming as far as you can, this lens will deliver the goods. Everyone else basically says this lens beats the 100-400mm L zoom, and although I've yet to test one of those, I hear that the 100-400mm L zoom is not "L" sharp at anything above 300mm unless you stop it down. However, I understand that the 100-400mm L zoom is sharper at 400mm wide open, than the 300mm L w/1.4 extender. For this point, I'd consider whether you're shooting a cropped sensor or full-frame (I prefer the former, actually--long story)

Would I choose the 400mm non-IS lens? No. I don't know anyone who can shoot at 400mm without a tripod unless the sun is out and light is bright. Even then, I'd still prefer at least a monopod. At 400mm even IS would be limited. Even the 300mm tested here is difficult to hand-hold with IS and nearly impossible without IS. IS makes a tremendous difference, but not having it would require a tripod. I don't always want to carry one.

I took a star off on my review only because I found the AF pretty lousy. It does a great job of what it does (focus), but hunts an awful lot if the background is busy enough. About 20% of the time, I've had to simply disable it. Don't let this scare you away. No, it is sweet when the composition is sparse, or your subject is quite obvious. But if you're shooting birds in a tree, it may hunt.

Noisy IS? My copy seems rather quiet, but it does exhibit little clunks when starting and stopping IS. Honestly, this happens in my more expensive 70-200 L USM IS, and it happens all the time on nearly every car's A/C compressor when it starts and stops every 30 seconds during the summer. It's a normal thing. Maybe Canon will put a clutch in the IS later on, right?

Bottom line, if resolution, contrast, color, and sharpness is what you're after and you don't mind the fact that you don't have zoom, you'll like this lens. the price for what you get is not bad, especially when compared to the faster 300mm L lens Canon offers.

This is a wonderful lens. I'm using it on a Canon 30D alone or with a Tamron 1.4x extender taking pictures of moving birds in dark conditions or close-ups of insects when I don't have time to change lenses. I can zoom in on the computer 3-4 times and still see a crisp picture. The auto-focus is crisp and it's very pleasurable to hear it snap onto a subject. With a tiny subject surrounded by large objects, it gets very close, and it's easy to switch to manual focus and finish focusing even with my not so great eyesight. It's relatively light weight is a help and I'm amazed at what I can take hand-held in difficult conditions no doubt thanks to the image stabilization. Now I wish I'd gotten the Canon 1.4x.

I recently purchased this lens and have been extremely impressed with the results it produces. The "IS" works extremely well.

I was a little concerned at first because the "IS" makes a little humming noise when in operation. I thought it was an issue at first due to the fact that my other "IS" lenses don't make the same noise, but found out it is completely normal for it to make the little humming noise that it does. I tested it out by turning off the "IS" and focusing in on a subject while hand holding my Canon 30D and I was moving around all over the place. Then I turned on the "IS" and it immediately made the image through the viewfinder much more steady and controled. It's nothing short of amazing.

The focus is quiet and quick, what more could you ask for? It provides crystal clear shots as long as your shutter speed is over 1/30th (hand held with IS on). If you combine a tripod and this lens in "IS" mode, you will lose image quality, so ensure you turn off the "IS" if you are using a tripod.

With the 1.4x teleconverter, it works great. Taking the 300mm and converting it to 420mm gives you a serious amount of "reach" for under $300 for the 1.4x teleconverter. The IS and the Autofocus work great with the 1.4x teleconverter, but I did notice the focus seemed to take just a touch longer, but it's so minor that most individuals probably wouldn't even notice. Combined with the 1.4x teleconverter, your F4 lens will convert to a F5.6 lens.

With the 2.0x teleconverter, you get range that you wouldn't be able to get unless you paid huge $$$ for a 600mm prime. The IS works well with the 2.0x but you lose the option for Autofocus. So if you stack this 300mm lens with a 2.0x teleconverter you will be manually focusing all your shots. Combined with the 2.0x teleconverter, your F4 lens will convert to F8.

Overall, this is a great lens at a great price, especially when you compare it to it's big brother the 300mm F2.8 that sells for nearly double the price of this lens. If you purchase this lens, you won't be disappointed.

I am very satisfied with this lens. I have not tried it with the 1.4 extender yet,but if it is as good with the extender as the reviews, I will be more satisfied than I am now.
The quality of sharpness is better than any lens I have purchased before. For the price it is probably the best in class. I have to have IS because of my age I have a slite shake when taking photos handheld. The lens takes very sharp photos even with my shaking hands.
I have taken some test shots on a tripod with the 2x extender with quite a bit of quality. It does take a solid built tripod to hold it. There is no allowance for any movement with the 2x extender,and it takes me awhile to ajust and focus in. So I would not recommend using it for action photography. Also you lose auto focus.
The 1.4x is suppose to work a lot better . Will update when I receive my 1.4x
So far I am satisfied completely,with the sharpness and build quality.
4/25/2007 I purchased a 1.4 extender and have tried it with the 300 prime,even in very cloudy weather I have taken very sharp photos. It does work as I had hoped it would,even dropping to F 5.6.