I'm considering buying a 24-105 L lens, to replace a Sigma 105 macro lens which seems to be incompatible with my 5D mk II. Is there a justification in any of your eyes in owning an L lens? Other Canom lens I'm trialing is the 70-300mm DO stabilized lens which seems really compact, sharp optically with a quick motor, very tempted, but it's not an L. Don't want anything heavy. Currently been working with 50mm 1.4 Canon, 20mm prime Canon, and the Sigma, but that's no longer working for me, it 'close focuses' by a foot on every shot.
Anyhow, L series - worthwhile if money no option?
Sigma AF 105mm f/2.8 EX macro DG is a full format lens, so not sure why yours isn't working if thats the model you have. Have you thought about getting the lens serviced?
If your intending to use the 24-105mm f4 as a replacement for your sigma 105mm macro lens and use it for macro, then personally the canon 100mm f2.8 is more suitable as its a true 1:1 macro lens. The 24-105mm f4 is a great lens and on a FF camera is the perfect walkaround lens, but its not a macro lens.
As for the 70-300mm f4-5.6 DO lens, yes its compact, its not sharp, actually produces soft images, its over priced and you would be better off getting the 70-300mm f4-5.6 IS which is a better lens for 1/2 the money.
I don't own any L glass; I prefer to take the non-L gems. However, I'm a hobbyist - not a pro - so I'm not after the best image quality available as I can't justify the expense. I'm happy with very good images from lenses which cost a fraction of the price.
I read this a while ago and it puts things into perspective a bit.
http://www.prime-junta.net/pont/Pontification/a0101_Why_I_Diss_L_Lenses/a_Why_I_Diss_L_Lenses.html
George.
Yep read the link, and he's only giving half the story, it really depends what you are photographing. Yes L series lenses are very expensive, but there are still affordable 1's out there like the 70-200mm f4 which is a great lens, or the 400mm f5.6 or 300mm f4 all great lenses for reasonable money. And yes there are some great non L series lenses as well.
You do notice a significant difference in speed of operation and quality of images when using a L series lens. OK there are 1 or 2 L series lenses that don't make the mark, but there are worth the investment if you can afford them.
Of course at the end of the day, money is the main driver, DSLR's have opened the world of photography to a larger audience. And you can only afford what you can afford.
Yes there are good alternatives to L series lenses at a faction of the price, but its finding them within the minefield of mis-information available on the net.