Novice here. Lens compatibility question

<p>Hi all,<br>

Novice new to the page. I have an old EOS Rebel. (about 14 years old). I am finally getting<br>

a new Rebel and am looking at the t5i. (Can't afford what I really want) I have a variety of Sigma/Canon lenses. The three I <br>

use the most are a Sigma DG 70-30 4-5.6, a Canon 50mm 1.8 and a Sigma 28-90 3.5-5.6. They range in<br>

age from 4-10 years old. I am unsure if any will be compatible with the new EOS and if I should figure new<br>

lenses into my budget. Really appreciate any help on this. <br>

Thanks in advance<br>

JB</p>

<p>Any Canon EOS EF or EF-S lens will work on a new T5i, regardless of age.<br>

<br /> The Sigmas will probably work but you will have to try them. Since Canon has never published the technical specifications of their electronic interface, third-party lens makers like Sigma and Tamron have had to figure it out for themselves. Sigma in particular has had a history of putting out lenses that worked on the cameras that existed when the lens was designed, but which may have trouble on later cameras. If you have trouble with a ten-year-old Sigma lens on a new camera, most likely Sigma will not help you.</p>

Absolutely I agree with Craig, as long as your using and EF or EFS lens for canon , I see no reason why there would be

any new with the old issues, A lot of the new package cameras have been comeing with 18-135 if I remebr right,so You

should be good to go,clean your contact points and have a great holiday season the new t5i is a massive improvement

coated to just 5 years back when the Rebel Xti and others came in to market, so your ISO and bir rate ,with more than

enough MPEG to crop your photos wih a mass of success,happy holidays .

Jim

<p>I guess I was ahead of the times in 2006, when I bought my XTi ;) - That was a pretty darn good camera for 8 yrs ago, but I would certainly hope the T5i would be better, after all, there have only been 6 or 7 generations between the two.</p>

<p>I would make sure you get a package that includes a kit lens (an 18-55 or something a bit longer). Even if your Sigma glass works as designed, you will loose everything wider than a 35mm equivalent of ~45mm because of the change in format (aka sensor size). an 18-55 is roughly the equivalent (on a digital rebel - in regards to focal length) as your Sigma 28-90 (the 18-55 => 28-88 mm ). The image quality will likely be superior as well - something you'll notice the first time you pixel peep.</p>

<p>What you can do to check the Sigma's compatibility with the digital rebels is simply go to a store and do a hands on with<em> any</em> current or recent past EOS digital Canon (including an XTi) - using your lenses. Change the f stop through the range, and try to shoot at a variety of f stops. If you don't get an error, it is most likely that your Sigma lenses will work fine on ANY EOS camera. That said, '01-'02 was when Sigma was in the midst of changing over to meet Canon's changes to their communications protocol. If the lenses are only 10 years old (at most), it is likely that you won't have a problem, but some lens models had both chipsets installed (depending on when they were manufactured), so, hypothetically, it's possible that a lens bought new 10yrs ago had been sitting on a shelf for 2 or 3 years, having been manufactured before the change over. Sounds unlikely, but stranger things have happened.</p>

Hasn't Sigma actually licensed EF (the protocol, not the physical fit) from Canon to use on its own cameras?

Regarding the focal lengths, it's a camera thing, not a lens thing. Since the Canon APS-C is smaller than 35mm film by

1.62x in each dimension, it will only capture the centre of the image circle, so what it will get from a 28mm lens is roughly

what a film camera would get from a 45mm one. This isn't a Canon issue, it's a product class issue - Canon, like others,

also makes much more expensive digital cameras with a 24x36 sensor.

<p>I disagree with Marcus about the compatibility test. You need to test both of your Sigma lenses against the exact model of camera you're thinking of buying. Anything else is uncertain. Sure, if it works on an older Rebel, it will <em>probably</em> work on a T5i, but you don't know for sure that it works on a T5i until you actually try it on a T5i.</p>

<p>Antonio: No, I don't think Canon has licensed the EF electronic protocols to anyone.</p>

<p>Well I<em> know</em> that if you mount your Sigma glass to any digital EOS manufactured between '03 and '13, and they work fine, then they <em>will</em> work properly on your new T5i. </p>

<p>I guess you can worry about it, but, frankly, neither lens is a gem, and a couple hundred will get you new glass that is significantly improved both from an operational standpoint (IS for example, and faster focus), and from an optical standpoint (much much improved once you (inevitable really) start pixel peeping). The FL issue is just icing on the cake.</p>

<p>The 18-55 IS STM lens which comes with the new Rebels is superior to its predecessors in image quality and / or usage, with a non-revolving front element, good for polariser and an efficiently shaped lens hood. Bought with the camera, they cost very little. I don't know the 18-135; good range, but guess you need to look at the reviews.<br>

The other IS STM lenses too are all done the same way I think. The Canon 10-18, at around $400, is the kind of lens not economically available 14 years ago. </p>

<p>I owned several Sigmas from the late 1990s and early 2000s and none of them worked on my digital EOS cameras. They mounted but gave an error when I attempted to stop down. I inquired at Sigma and was told ROM updates weren't supplied for older lenses. My late 1980s EF 50 1.8 still works on all my EOS cameras, including fairly recent models such as the SL1 and 70D.</p>

<p>I agree with the other poster, the EF-s 18-55 STM is a greater starter optic and far better suited for the t5i than the ancient Sigmas.</p>

Craig is right, there is no evidence that Canon ever licensed EF, and there is a statement in an interview that may confirm

it didn't.

What got me confused was the apparent fact that Sigma did use their reverse engineered version of EF for their own

camera bodies. That says nothing about their lenses' compatibility with Canon bodies.