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Dan Alexander's Avatar
 
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OT - Wide angle lens question

I have a Canon digital EOS Rebel that has the 18-55mm lens and I need something wider for interior shots of renovation projects in kitchens and bathrooms and basements. My SO gave me one of these

http://www.adorama.com/CA2035AFU.html

for Xmas but it isn't as wide as the original lens. I get confused because some lenses have the length in digital terms and some use 35mm .. how do I tell the diference? What would you guys recommend as a good wide lens that doesn't cost a grand?

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Old 06-03-2007, 06:03 PM
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...I have the 20D and the widest lens I am shooting is the 17 -40L... a bit pricey but it gives you all you need and then some... if you look around, you might be able to score one for 550 to 600 bucks...
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Old 06-03-2007, 06:07 PM
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What are these things?

http://cgi.ebay.com/Wide-Angle-Close-Up-Combo-Lens-for-Canon-Rebel-XT-XTi_W0QQitemZ160124069456QQihZ006QQcategoryZ106845 QQrdZ1QQcmdZViewItem
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Old 06-03-2007, 06:07 PM
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my lens that came with the camera is a 18-55 so that should be a bit wider than yours ..right? I need even wider.
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Old 06-03-2007, 06:09 PM
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I don't own a Canon but from what I've read you want the 10-22mm lens. My Nikon equivalent is the Sigma 10-20, which you can also buy for a Canon. I think it's recognized as the best wide angle lens. It's also ultrasonic!

Canon EF-S 10-22mm f/3.5-4.5 USM SLR Lens $635



Sigma 10-20mm $465

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Last edited by ckcarr; 06-03-2007 at 06:16 PM..
Old 06-03-2007, 06:10 PM
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Junk. Don't add junk to a nice camera.
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Old 06-03-2007, 06:14 PM
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sounded too good to be true

I just read a review of the lens you showed me .. it sounds great

http://www.luminous-landscape.com/reviews/lenses/Canon-10-22mm-test.shtml
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Old 06-03-2007, 06:23 PM
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It is great from everything I've read. Better than anything available for Nikon right now.


As far as the lens your SO gave you... It would be considered a wide angle on a 35mm film camera. Unfortunately, on the new breed of digital SLR's that kind of wide isn't. The reason is the sensor technology. Without getting into too much detail a digital camera like my Nikon has a sensor that's smaller than the film frame on a 35mm which is 24mm x 35mm. An easy calculation is that since my sensor (Nikon) is 2/3 the size of the film frame you need to multiply the lens size by 1.5 to see how it will function as compared to a film body. So my 10-20mm Sigma will really perform as a 15-30mm film lens.

On a Canon, I think the factor is more severe, such as 1.6 instead of 1.5, so that 20-35mm functions like a 32-56mm lens...

And since you now have a DSLR you may as well start collecting lenses. Otherwise you may as well have a point and shoot. Get your wallet out.

The Goosenecks at 10mm



Same picture at 18mm

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Old 06-03-2007, 07:08 PM
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Most SLR lenses are based on the full frame 35mm film format, however, most digital SLR senors are not the same size as the full 35mm film. Instead most DSLRs have a sensor the size of the older APS film format (a smaller sensor). What this means is that non-digital lenses on a DSLR will magnify the image by 1.6x. A 50mm non-digital lens will therefore be the equivalent of a 80mm lens when used on a DSLR.

I also use the 17-40mm L lens on my DSLR so its effective range is really 27.2-64mm.

Since you have the Rebel, you should be able to use the EFS lenses that are lenses designed for the smaller sensor. An EFS lens range doesn't need to have the 1.6x multiplier applied so the 10-20mm lens listed in this post is actually 10-20mm. That lens will give you what you're looking for.

Side notes:
-the Canon 5D is a full frame DSLR so using the 17-40mm L on that camera would yield 17-40mm without the 1.6x multiplier.
-a nice plus to the EFS lenses is that they are lighter and smaller than non-digital lenses.
Old 06-03-2007, 07:33 PM
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Nikon DSLRs have one crop factor, 1.5. Canon has three, 1.6 (yours), 1.3, and 1.0 (5D). The 10-22mm will have a 16-35mm 35mm equivalent on your camera. Nice and wide, but you'll probably have to use some software to remove the distortion. Lighting can be tricky, too. I recommend paging johnnydanger. He'll know...
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Old 06-03-2007, 09:41 PM
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You could trade UP to a Canon 5D. It has a sensor the same size as a 35mm camera and so has a 1:1 magnification factor.
I have a 20D and wish I could trade up.
Mark
Old 06-04-2007, 02:12 AM
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Quote:
Originally posted by feds27
Since you have the Rebel, you should be able to use the EFS lenses that are lenses designed for the smaller sensor. An EFS lens range doesn't need to have the 1.6x multiplier applied so the 10-20mm lens listed in this post is actually 10-20mm. That lens will give you what you're looking for.
This is NOT! true. The range listed on an EFS lens is 35mm range. An EFS lens does have a few advantages; they can be built more compact and are cheaper as the outer edges of the lens are not used on APS size camera's.

ALL Canon lenses list their range as 35mm SLR range. There is not a single Canon lens that lists their range corrected for a crop factor.

In fact, this holds up also for Sigma, Tamron and as far as I know any other manufactorer, including Nikon.

Just because a lens is made specifically for a digital camera or crop factor camera does not change this.

Second, the topicstarter lists the Rebel. If this is the original Rebel, it is NOT compatible with the EFS mount. Only the Rebel XT, Rebel XTi, 20D and 30D are compatible with EFS.
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Old 06-04-2007, 02:24 AM
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Get my wallet out, eh .. I was afraid that would happen

Lots of info, thanks guys. I went to photography school after high school many moons ago but forgot most of it. So all lenses whether made for digital or not always used the same numbering system?

I've got the original Rebel, not the XT so that means the EF-S won't fit?? That looked like a good lens and the price wasn't too bad. I've also got a Canon EF 75-300 that fits so is it the 'EF-S' that I have to stay away from? The joys of ebaying doesn't give any chance of returns, like the 20-35 I got .... guess it goes up for sale, anyone need one of those
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Old 06-04-2007, 03:52 AM
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Thanks from me on the lens information, I haven't gotten a digital SLR yet (waiting for someone to hock me one) but I knew the lens #'s on my p&s Canon were a little flakey.
Jim
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Old 06-04-2007, 04:28 AM
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I just checked out the Canon site, the 10-22mm is listed as being equivalent to a 16-35mm as Steve and Throttlemeister said.

I'm surprised, I thought the whole purpose of the EFS mount was to offer lenses that match the sensor size of the camera. I also thought the way they achieved the smaller/lighter lenses was due to designing it for the smaller sensor.

Could it be the lenses are indeed designed for the smaller sensor (no crop) but Canon chooses to list their focal range in 35mm equivalents in order to keep the labeling consistent with their other lenses?
Old 06-04-2007, 07:35 AM
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Yes, it's to stay consistant across the range. The purpose of the EFS range is exactly as you say though.

Smaller sensor -> less quality needed at the edges of the glass (you use only the center) -> less glass needed for the same optical quality -> cheaper to manufacture.
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Old 06-04-2007, 09:26 AM
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Quote:
Originally posted by throttlemeister
Second, the topicstarter lists the Rebel. If this is the original Rebel, it is NOT compatible with the EFS mount. Only the Rebel XT, Rebel XTi, 20D and 30D are compatible with EFS.
How do I tell if the Rebel I have is an XT or not? All it says on the front is EOS and down below Digital Rebel. The 18-55 lens on it says it's an EFS so It must be an XT ..correct?
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2008 KTM 950 Super Enduro long distance gravel road and general hooligan bike.
Now an R11GS and a 650 Dakar
Old 06-04-2007, 02:57 PM
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The original Rebel was a 35mm film camera. When Canon went digital, they didn't mount the legacy lenses. Nikon did, ha ha. I PM'd johnnydanger for some advice in this thread; he shoots Canon professionally.
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Old 06-04-2007, 03:13 PM
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Where the heck is Johnny when you need him?

I'm sure I've got an XT ... I went to Canon's site to check what model my battery grip fits but my BG-E1 isn't there anymore it's now a BG-2 which is made for the XTi
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Old 06-04-2007, 03:31 PM
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All crop sensor Canons (from the 20D / first Rebel) on support EF-S lenses. See the DP Review article on the first digital Rebel (300D):

http://www.dpreview.com/reviews/canoneos300d/

The 10-22mm (16-35mm equiv) EF-S is the widest recti-linear lense you can get for a crop body. You could shoot a Sigma 8mm or the 15mm fisheye, but then you have to process the 'fish' out of it. The 10-22 is feasibly the best way to go for an EF-S body.

The original Rebel is a 300D (6.2 megapixel), the 2nd gen one is the 350D (also known as the XT), and the 3rd gen on is the 400D (also known as the XTi). They all support EF-S.

EF-S lenses are different because the image circle is designed for a crop sensor. The lense isn't ONLY smaller though, it goes deeper into the camera body so that the rear element is nearer to the sensor. This allows smaller glass up front, et. The advantage is that it allows cheaper/lighter weight lense construction. All the numbers are always based in 35mm film world, even on EF-S lenses. The depth of field is as the lense length indicates, NOT at the equivalent length. Hence a 10-22mm EF-S on a crop body has MUCH MORE depth of field than a 17-40mm EF lense on a full frame Canon 5D when the same shot is taken at the same distance from the subject. Anyways, if you think you'll be staying with an EF-S crop body you should buy the 10-22mm EF-S.

Good luck!

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