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PostPosted: Mon Oct 13, 2008 1:41 am 
I've been looking at Sigma lenses lately, and I've noticed that the 24mm f/1.8 is larger and heavier than the 30mm f/1.4.
I'm talking about the olympus 4/3 mount.
could someone tell me why that is so?

which one is better for that matter?

Last edited by bartosz on Mon Oct 13, 2008 12:18 pm, edited 1 time in total.

 Post subject:
PostPosted: Mon Oct 13, 2008 9:27 am 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9886
Location: UK
The 30mm F1.4 EX DC HSM is designed for cropped sensor cameras whilst the 24mm F1.8 EX DG ASPHERICAL MACRO can be used on full-framers. No doubt the choice of the types of glass and the number of elements is also a factor.


Sony RX1R II. Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, M.Zuiko Digital ED 40-150mm f/2.8 + 1.4x T/C, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8
M.Zuiko Digital ED 75mm 1:1.8, Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.

 Post subject:
PostPosted: Mon Oct 13, 2008 9:53 pm 
is there any major difference in quality between them?

 Post subject:
PostPosted: Fri Nov 14, 2008 6:29 pm 
30mm is 2/3 stops faster and has HSM, but it doesn't have good corner sharpness.

24mm has normal screw focusing but becouse it have been designed for FF it has good corner sharpness.

So if you are looking good portrait glass then 30mm is your choise but if you're looking good glass for landscape or group portraits then 24mm is your choise. And remember that there is also 20mm f/1.8 which is even better for landscapes.

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