What would be sharper

What do you think would produce a sharper image on a T21
I'm looking at getting either the Cannon 24-105 f4 L
or the sigma 30 1.4 - canon 50 1.4 - Canon 85 1.8
So what would produce a sharper image ? the L glass or a non L prime
Thanks for your thoughts

I think the question you should be asking is do you want the convience of a zoom vs. the speed of primes. In terms of sharpness, the primes will be a bit sharper typically at similar focal lengths and apertures but its hardly something to fret over.

The primes should be sharper at f/4.. and nearly the same results after f/5.6
The color rendition & bokeh of the L zoom should be better...

The main question is to know if you need aperture like f/2 or not ?

Titi

Well one thing for certain is the 24-105 will be alot sharper at 24/f4 then any of the primes you have mentioned wide open and thats a certain for sure.

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But all three of those primes stopped down to f2.8 will be very nice and still 1 stop faster then the slower 24-105/f4.

IMO instead of spending money on the 24-105 which is really designed for a FF format i would consider the Sigma 17-50/f2.8 + an external flash for your crop body. Then save for the Canon 70-200/f4 IS. But thats just me.

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Regards whatever your decision,

The primes will be sharper. Replace the canon 50 1.4 with a sigma 50 1.4 and that will be even more sharp(er).
But personally, I'd have the primes AND a zoom. The primes for low light work and the zoom for every day use.

17-55 IS, Sigma 30, Tokina 11-16, Canon 70-200 variant.

If you can't afford the 17-55 IS, get the Tamron 17-50.

If you can't afford a Canon 70-200, get the 55-250 IS.

If you can't afford the Sigma 30, get the 50/1.8.

If you can't afford the Tokina 11-16, save up and get one of the 17-5X beasts.

All are sharp. What in the world do you plan on shooting? Guess it doesn't matter since the range is all over the place.

cepaw wrote in post #12445721
What do you think would produce a sharper image on a T21
I'm looking at getting either the Cannon 24-105 f4 L
or the sigma 30 1.4 - canon 50 1.4 - Canon 85 1.8
So what would produce a sharper image ? the L glass or a non L prime
Thanks for your thoughts

it might be better to first determine your subject then decide on a lens, e.g. portrait? landscape? macro?
or all of the above

In real world use, all are sufficiently sharp. What's your intended use?

I have the 24-105L, love it. Even on my Rebel it's a great lens and it becomes something like a 36-144 on your t2i, it came with my 5D when I bought it. Probably the best walkaround i've ever shot with, good enough for 150 miles this weekend at MSBike.