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Honored Contributor
Posts: 6,240
Registered: ‎11-13-2012

Re: Good Prime Lens for Canon T5i (APS-C)

Focal length is a property of the lens. The 17-55mm lens is 5mm longer than the 50mm lens. The angle of view or field of view is affected by the crop factor. The EF-S designation on the zoom lens denotes the lens mount. EF-S lenses are not compatible with full frame cameras. EF mount lenses are.
John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LR Classic
VIP
Posts: 12,081
Registered: ‎12-07-2012

Re: Good Prime Lens for Canon T5i (APS-C)

"I choise the EF 50MM 1.8 becasue A. I might want to zoom farther than the 55mm on the EF-S lense will give me, and a 50mmEF = 80mm on an APS-C."

 

This makes no sense at all. I am stil so confused with what all you are saying.  You bought a great lens in the EF-S 17-55mm f/2.8 IS USM Lens. You don't need the ef 50mm f1.8 if you think it is longer (FL) it isn't. In fact it is shorter (FL)!  It is 50mm vs 55mm or equivalent 80mm vs 88mm. Send it back. Keep the EF-S 17-55mm f/2.8 IS USM Lens that is the only lens you need.

EOS 1DX and 1D Mk IV and several lenses!
Occasional Contributor
Posts: 11
Registered: ‎01-16-2020

Re: Good Prime Lens for Canon T5i (APS-C)

Yes, but the 18-55mm is an APS-C Lens (EF-S) while the 50mm is an EF (Full Frame) lense.

Honored Contributor
Posts: 6,240
Registered: ‎11-13-2012

Re: Good Prime Lens for Canon T5i (APS-C)

The operative term to consider in crop sensor camera is “crop”.

What a crop sensor does is in effect crop a full size image so only a portion is on the sensor. The angle of view, or the projected image, for a 50mm lens is the same as an 80mm lens on a full frame camera.
John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LR Classic
Occasional Contributor
Posts: 11
Registered: ‎01-16-2020

Re: Good Prime Lens for Canon T5i (APS-C)

Well I already ordered it, so I'll try it out.  I have 14 days to return it.

Honored Contributor
Posts: 6,240
Registered: ‎11-13-2012

Re: Good Prime Lens for Canon T5i (APS-C)

[ Edited ]

“ Yes, but the 18-55mm is an APS-C Lens (EF-S) while the 50mm is an EF (Full Frame) lense.”

That is a common confusion/misconception. EF-S describes a mechanical lens mount design. APS-C describes a sensor size.

An EF-S lens will only fit on an EF-S lens mount

A lens designated as APS-C usually has a projected image circle only large enough to cover an APS-C sensor, which is why they tend to be smaller and less expensive- everything else equal.

Focal length is a physical property of the lens - it is not affected by the lens mount.

 

The 50mm f/1.8 isn't going to give you what you thought (i.e.25mm more than your zoom), but it is a great lens. It is sharp, light, relatively inexpensive and makes a nice lightweight portrait setup on a Rebel body. Small, light, inobtrusive and a shallower depth of field than a 2.8 lens.

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LR Classic
VIP
Posts: 12,081
Registered: ‎12-07-2012

Re: Good Prime Lens for Canon T5i (APS-C)

"The 50mm f/1.8 isn't going to give you  do what you thought, ... It is sharp, light, relatively inexpensive and makes a nice lightweight portrait setup on a Rebel body."

 

The "single" thing the 50mil prime has going for it, is price.  Nothing else, matter of fact it is a limited use lens.  It does make a good portrait lens as mention in the quote but so does the Canon EF-S 17-55mm f/2.8 IS USM Lens.  All you did was duplicate the FL.

A lens is a lens is a lens and can never change unless physically altered. It matters not what camera you put it on, its FL can never change.

You need to educate yourself in photography otherwise you are going to waste money buying things that you don't need. It is clear you don't have a good understanding how this works. I would encourage you to ask questions and be as plain and open as possible.  Most of us here are willing and able to help.

EOS 1DX and 1D Mk IV and several lenses!
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