Sigma 105mm for Canon 40D?

Ok, I was leaning towards buying a Canon Ext tube 12 and a Kenko 1.4x Pro Teleconverter for my Canon EF-S 60mm lens(to get more than 1:1 maginification), however, at $300(for both) it comes close to $470 or so for a Sigma 105mm. Ports I'm using have 4.7 inches clearance, which means they can accomodate the Sigma. However, I can't find any info whether it's got a lock?(extended length is 4.8 inches, when not extending, I think, it's at 3.8 inches).

What is the advantage of using one vs the other? I know by buying the Sigma, I'd be getting a lens, instead of a couple of rings. I also assume the magnification with the teleconverter would be greater than what I'd get with the Sigma?

Unfortunately I can't use the Canon 100mm because it's 4.8 inches long, even though I could try placing the camera couple mm back on the shoe, still locks and all dials/buttons work fine(not sure if that's a good idea)?

Thanks,

Blueline

Ok, I was leaning towards buying a Canon Ext tube 12 and a Kenko 1.4x Pro Teleconverter for my Canon EF-S 60mm lens(to get more than 1:1 maginification), however, at $300(for both) it comes close to $470 or so for a Sigma 105mm. Ports I'm using have 4.7 inches clearance, which means they can accomodate the Sigma. However, I can't find any info whether it's got a lock?(extended length is 4.8 inches, when not extending, I think, it's at 3.8 inches).

Sigma's 105 is optically good, but built very poorly and not fast focusing. Canon's 100 USM is really, really good and not that much more money...

Ok, I was leaning towards buying a Canon Ext tube 12 and a Kenko 1.4x Pro Teleconverter for my Canon EF-S 60mm lens(to get more than 1:1 maginification), however, at $300(for both) it comes close to $470 or so for a Sigma 105mm. Ports I'm using have 4.7 inches clearance, which means they can accomodate the Sigma. However, I can't find any info whether it's got a lock?(extended length is 4.8 inches, when not extending, I think, it's at 3.8 inches).

 

What is the advantage of using one vs the other? I know by buying the Sigma, I'd be getting a lens, instead of a couple of rings. I also assume the magnification with the teleconverter would be greater than what I'd get with the Sigma?

 

Unfortunately I can't use the Canon 100mm because it's 4.8 inches long, even though I could try placing the camera couple mm back on the shoe, still locks and all dials/buttons work fine(not sure if that's a good idea)?

 

Thanks,

Blueline

Will the Canon 100mm fit in a NX Compact Macro Port Base + Compact Macro Port S (35)? <-- 4.7 inches per Sea & sea site(i'd have to measure tonight to make sure)

Canon 100mm length=4.7 inches too (I know lenses sit a bit back in the housing(maybe 1-2mm))

I'm not sure if getting another lens is the best option here, plus adding ports will inflate cost. I'm just looking for better maginification than 1:1, that is why i considered the extension tube+tele. But I guess getting a 100mm/105mm lens would allow me to shoot from a greater distance.

Will the Canon 100mm fit in a NX Compact Macro Port Base + Compact Macro Port S (35)? <-- 4.7 inches per Sea & sea site(i'd have to measure tonight to make sure)

 

Canon 100mm length=4.7 inches too (I know lenses sit a bit back in the housing(maybe 1-2mm))

 

I'm not sure if getting another lens is the best option here, plus adding ports will inflate cost. I'm just looking for better maginification than 1:1, that is why i considered the extension tube+tele. But I guess getting a 100mm/105mm lens would allow me to shoot from a greater distance.

I am not sure why you think either the Sigma or the Canon will get you more magnification than your 60 mm. All are 1:1 but of course you get more working distance. Why don't you try out some external diopters.

Bill

I am not sure why you think either the Sigma or the Canon will get you more magnification than your 60 mm. All are 1:1 but of course you get more working distance. Why don't you try out some external diopters.

Bill

I've thought of getting a diopter but I want to be able to use the setup for topside photography too. So many options,...a never ending story.

From memory the 60mm is not compatable with the T/C. I could be wrong, but I am sure I looked at the same thing some time ago.

Stew

From memory the 60mm is not compatable with the T/C. I could be wrong, but I am sure I looked at the same thing some time ago.

 

Stew

Stew is right, there are no TCs that can fit on the EF-s lenses, but you can add a Canon/Kenko thin extension tube then run the 60. I do that when I want to shoot the 60 on the 5d.

Bill

in practice i think there is a difference in magnication available from the Canon 100 vs 60 because 1:1 with the 60 is so close to the port that it's impractical - too close to the subject and too close to give lighting flexibility

in practice i think there is a difference in magnication available from the Canon 100 vs 60 because 1:1 with the 60 is so close to the port that it's impractical - too close to the subject and too close to give lighting flexibility

Depends on the port and the lighting. I can get very close to 1:1 with the 60 using a ringflash. The closest focus distance is about 9 inches from the sensor or 4 inches or so from the front of the port. Of course if you stick it into a port designed for the 100 macro you will lose a bunch.

Bill