is it worth adding at 24mm prime to my kit?

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This is a kinda horses for courses questions but.

I am currently working with -- 35mm f/1.4 - 50mm f/1.4 - 85mm f/1.8 and a 70-200 f/2.8 with a 24-70 f/2.8 backup on two bodies (5d MKII and MKIII)

I am looking to ditch the 70-200. Ideally I wanted a 135L to continue to have a bit of reach when needed but what about a sigma 24mm f/1.8 Macro?

I dont think it would be up to the quality of the 35 so I would possibly end up not using it at all - is it to close in focal length to the 35? opinions.

Primarily I shoot weddings.
 
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I am a hobbyst who covers events (classical music) in very low light (mostly shooting wide open) with a 40D and 5D. (I don't own a 2.8 zoom lens suitable for both bodies).
I mostly use a 35mm f2, 85mm f1.8 and a 135mm f2L.
I have a 24mm f2.8 and a 50mm f1.8 for backup.
I have only used to 24mm and 50mm once or twice over the last 5 years to see how they go.
The IQ, even for the consumer lenses is ok and meets my "clients" needs for web publishing and ocassional smaller prints.
 
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I wouldn't get a 24 if I had a 35 [which I have] - If I wanted something wider I'd look into the Samyang offerings. They have a new 10mm on the way.
 
24mm is quite a bit wider than 35 if you can't physically back up so if you need the width you need the width and a prime may display less distortion than your zoom at 24 plus of course it'll have that wider aperture.

I had the as far as I know optically similar Sigma 20mm f1.8 and thought it was a good lens so I think the 24 may well be worth a look. Personally manual focus with a modern dslr doesn't interest me fot anything other than macro type shots.
 
Nah no worries, I just wouldn't have suggested a 10mm :D 24 would be useful for weddings. I have a couple in the summer myself, widest I have atm is the 35 1.4 too. May have to beg, borrow or steal
 
Just searched it, and there's an art version on the way, Not until October though
 
Im a wedding shooter so I don't think I'd get much use out of a 10mm... other than for shock value.
I always bring my 10mm to weddings, it gives the group shots a more unusual and dramatic look. Mind you, I always take the shot with the more usual lens as well!

UWAs are pretty good for the setup shots as well!
 
Only you can answer that question, it's not really the 24 mm you want as you have a 24-70 but it's the 2 stop of light.

When was the last time you used the 24-70 and wished you had 2 stop of light?

P.s. I have all the primes you have and want to get. I think the 24/1.4 is great, it's sharp and great on the dance floor.
 
Only you can answer that question, it's not really the 24 mm you want as you have a 24-70 but it's the 2 stop of light.

When was the last time you used the 24-70 and wished you had 2 stop of light?

P.s. I have all the primes you have and want to get. I think the 24/1.4 is great, it's sharp and great on the dance floor.

Possibly not all that often. That's more than covered with the 35mm...

(As an aside, having lived with the new sigma 50mm would you recommend it as an upgrade to the canon f/1.4? I think I just 'want' it rather than any real need for it)
 
Had a Sigma 24mm 1.8 on Nikon and wasn't overly impressed with it. Not hugely sharp for a prime and the front element was slightly wobbly which isn't uncommon I believe. If you're dead set on a 24, I'd wait and see if the rumours of a 1.4 'Art' model come to fruition, as the 35mm 1.4 is a peach of a lens.
 
Possibly not all that often. That's more than covered with the 35mm...

(As an aside, having lived with the new sigma 50mm would you recommend it as an upgrade to the canon f/1.4? I think I just 'want' it rather than any real need for it)

If you pixel peep, yes. If you don't then the Canon 50/1.4 is perfectly fine.

CA on the sigma is less
AF is about the same, may be better.
It is sharper, no doubt.
Built better, much.
 
Th
How much focusing is needed for a 10mm though?
There is a massive difference between 10 and 24mm. So much so that it's hard to believe they'd be on the same shopping list. As for focus it'll depend how close or how big the subject is in the frame and how close you look / how fussy you are but mostly non macro, non hyperfocal and non zone focus manual focus is IMVHO a right royal PITA with a dslr. YMMV.
 
There is a massive difference between 10 and 24mm. So much so that it's hard to believe they'd be on the same shopping list. As for focus it'll depend how close or how big the subject is in the frame and how close you look / how fussy you are but mostly non macro, non hyperfocal and non zone focus manual focus is IMVHO a right royal PITA with a dslr. YMMV.

+1 on all of that.

There is one option to help out with MF if you are looking at the Samyang, which is to buy the Nikon mount version and also an AF-confirm F mount to EF adapter. These contain a chip which fools your EOS camera into thinking it has an autofocus EF lens operating in manual mode mounted; you then get in-focus confirmation highlights in the viewfinder. The 'native' EF mount Samyang lenses don't do this.
 
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