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post #11 of 17
Quote:
Originally Posted by mz-n10 View Post
i dont think "hunting" has anything to do with USM vs micromotor, its more to do with the 1/2 stop more light that hits the AF array, with that said it also helps that USM can focus back and forth alot faster.
It must on some level, because when I tested the 1.4 and the 1.8, I couldn't get the 1.8 to focus at all in low light, and I doubt the 1/2 stop is the reason.

This poster from POTN says it better than I can:

Quote:
Originally Posted by Tom W
I think that the stop/start is less precise with the non-USM lenses (and maybe even the micro-USM whose motor is separate from the focus ring as well).

True ring USM has no gears - the "armature" is integrel to the focus barrel/ring and can be very precisely started and stopped, whereas non-USM mechanisms have a considerably larger amount of mechanical "slop" not to mention the increased inertia of more moving parts. The older, more complex mechanical mechanism is bound to overshoot the proper focus point more readily than the lighter, simpler ring USM.

That's not to say that non-USM lenses are terrible - they just aren't quite as precise as the USM. Plus, they will hunt more before acheiving focus (probably related to the overshoot and mechanical slop).
Quote:
Originally Posted by sub50hz View Post
I suppose I should have bolded what I was referring to, which was his "not an upgrade" stance on non-USM lenses.
Well, in all honesty, I wasn't being elitist. Check out reviews for Canon's non-USM lenses. There aren't really any gems unfortunately. Features like IS are things you can do without.
Edited by GoneTomorrow - 2/14/11 at 4:48pm
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post #12 of 17
Quote:
Originally Posted by GoneTomorrow View Post
Check out reviews for Canon's non-USM lenses. There aren't really any gems unfortunately.
http://www.slrgear.com/reviews/showp...uct/147/cat/10

The 35mm f/2 is quite good, and a whole ton cheaper than its L counterpart. Additionally, lenses like the EF-S 55-250 are also quite good for such a small hit on the wallet. Those who don't need/don't want to spend a ton of money on lenses can still get excellent IQ by doing a little research.

Personally, USM is a bonus for the type of photography I enjoy, since I'm rarely shooting sports or fast-moving objects. I've got a very relaxed approach, and don't think egregious spending makes someone a better photographer. That being said, I absolutely think that features like IS and USM can be of use to those who absolutely need it (i.e. career photograpers) -- but it's absolutely not a necessity for the majority of people out there. I'm sorry if you disagree with that, but in my personal experience, I simply do not think that writing the check for a big, white lens is the only way to go.

edit: Let me make one thing clear: if I had the spare money, sure, I would have the best of the best. Unfortunately, I have other financial constraints/hobbies which require me to be a bit more pennywise when buying camera gear.
post #13 of 17
Thread Starter 
thanks yall i got my eyes on the 85 1.8 or the 135L

money is no option when it comes to what i need. having USM as well as the ability to accurately focus with focus readout on the lens is important thats why the 50 1.4 is something i have already decided on. i needed to hear other opinions because although i do a lot of sports for fun for my school newspaper. i need solid gear for video work as in my next production meeting at my TV station im going to push them to upgrade to either an HD camera or convince them to use a DSLR for my studio segment that i am the cinematographer for. if im lucky which honestly im just dreaming but hey... i can get them to buy me the gear and if i dream hard enough then ill have them buy a better camera which means 1DmkIV would be so awesome with the glass i want to get
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post #14 of 17
Quote:
Originally Posted by GoneTomorrow View Post
It must on some level, because when I tested the 1.4 and the 1.8, I couldn't get the 1.8 to focus at all in low light, and I doubt the 1/2 stop is the reason.

This poster from POTN says it better than I can:
that might be true for ring type USM lenses, but the 50/1.4 doesnt use a ring type USM (like in the L) it is a micromotor USM (probably closer to non-usm lenses).
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post #15 of 17
Quote:
Originally Posted by mz-n10 View Post
that might be true for ring type USM lenses, but the 50/1.4 doesnt use a ring type USM (like in the L) it is a micromotor USM (probably closer to non-usm lenses).
Trust me, I've owned both the 1.4 and the 1.8 (simultaneously) and they're not even close. Of course, the 1.4 is slower yet than ring-type USM, but it still manages to have full-time manual.
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post #16 of 17
I'd get the 135L, as it's multi-purpose. Long portrait lens, or medium telephoto (when you crop the final image). It's also supposed to be stunning.
post #17 of 17
Quote:
Originally Posted by Boyboyd View Post
I'd get the 135L, as it's multi-purpose. Long portrait lens, or medium telephoto (when you crop the final image). It's also supposed to be stunning.
It makes a great close range sports lens, extremely fast AF. The extra reach on APS-C makes it even better for this.
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