My body is a T1i. My friend has an EF 75-300 1:4-5.6 IS lens he was selling cheap so I tried it out. Pictures show up out of focus and just plain weird looking.

Is there something wrong with the lens or is it just not compatible?

thx

 

its compatible, the lens was probably just a poor copy. Any Canon EF or EFS lens is compatible with your body

 

That's what I thought. I think something may be wrong with it. It has the Image Stabilizer and it makes some strange noises you can feel in the lens.

Pictures look like they're taken through a fogged up window, whether the IS is on of off.

 

The noises, about right. Most will make a noise, the cheaper the lens, the more noise. The fog, was the lens in a cold place before you used it?


Canon EF lenses, good on all EOS bodies built after 1989.

 

This is a real Canon Ultrasonic lens.

Nope, everything is at room temp and both ends look clean. When the lens clicks you can actually see the frame jump when looking through the eye piece. Leads me to believe this thing is broken somehow.

 

the jumping image in the frame screams broken IS motor to me.

 

Here is what you need to know.

Currently Canon has 2 mounts for their DSLR. The EF mount, and the EF-S.

The EF mount is for full frame Canon DSLR and SLR.

The EF-S was created for the cropped DSLRs such as your T1i and my rebel XT, such DSLRs with crapped sensors can accept both the EF-S and the EF. A DSLR with a full frame however, cannot use an EF-S lens.

Heres how EF-S and EF affect you.

When you have a full frame DSLR, you use an EF lens because EF lenses were created for such camera. Thus when an EF lens is rated at 50mm, thats the zoom you will get.

When you use the same 50mm EF lens on a cropped sensor DSLR you actually dont, because the sensor has a 1.6x crop factor so it's like having an 80mm lens. A LOT more zoom. This is why EF-S lenses are made. They are for DSLRs with cropped lenses. So when an EF-S lens say it's 50mm, it means that on your camera it will actually give you a 50mm zoom, and not an 80mm.

So when you're looking at your friends 75mm-300mm, do note that on your T1i it will basically be a 120mm-480mm. This can either work to your advantage or work against it, i cant say, because I dont know what you plan on using the lens for.

 

No edit button? Not cool!

"They are for DSLRs with cropped lenses" should have said "They are for DSLRs with cropped sensors."

Also, I'd like to add in the fact, that it's somewhat difficult to have both EF-S and EF lenses. Usually people go with cropped sensors and buy all EF-S lenses or buy a full frame and buy EF lenses.

I know EF-S is a relatively new mount, but the market for it has really improved and it's picked up. So hopefully sometime in the future we'll see EF-S L series lenses. Regardless though, there are some EF-S lenses that are L series quality(in terms of glass), but simply dont have the weather proofing that is part of what makes an L series an L series.

 

EF-S lenses ( "S" standing for "short back focus") does not fix the focal length of the lens. If you shooting at 50mm with a Canon cropped body you're shooting at 80mm, (50*1.6).

Take a look at the Apparent Focal Length on the chart linked for Canon. APS-C are Canon 1.6 bodies. APS-H are Canons 1.3 cropped bodies.

http://www.usa.canon.com/app/pdf/lens/EFLensChart.pdf

Yes a couple of them are pretty close to "L" status the 17-55 is one of them. Along with the weather proofing, the "L" lenses made better using Fluorite elements and better glass.

 

I'm kind of in shock here to be honest. I'm definitely going back to ritz camera and telling that guy he fed me wrong info! Thank you for correcting me on it.

 

Wow great info! Thanks!

 

By the way, I did some real research my self, and I now see the difference.

 

Glad to have helped, please be careful of Ritz, if you want to learn, with being a Canon owner, check out this site http://photography-on-the.net/forum/index.php

and of course here.

 

@ RitzCamera giving out photography tips.

 

Yeah, I actually dont have an Acura. I know Sandals, and he told me the forum has a pretty good photography section hence why I'm here. It's definitely A LOT more active than a lot of other photography forums I've been to, which is nice.