p.1 #1 · Canon Macro Flashes for Sigma 105mm macro?
Are the Canon macro ring flashes dimensionally compatible with the Sigma 105mm macro lens? I see that the 50mm f/2.5 (52mm thread) and the 100mm f/2.8 (58mm thread) do not need any accessory to fit either ring flash, but I was curious if this has to do with more than the thread size. Help is appreciated!!
Best Regards, Carlos Ch.
p.1 #2 · Canon Macro Flashes for Sigma 105mm macro?
Carlos, Its not the size of the filter as it is more the diameter of the lens itself.
The Canon macro len's have a groove that is cut into the end of the lens that
the macro flash is connected to.... So if you measure the outer diameter of
a 100mm macro lens from Canon and compare it to the Sigma you might be able
to rig something up.... but most likely you would not be able to rotate the
flash as you would be able to on the Canon lens. So the functions of the flash
may be limited if you can fit it.....
p.1 #3 · Canon Macro Flashes for Sigma 105mm macro?
iI remember reading somewhere that you had to screw a cokin filter older (just the ring) at the front of the sigma lens to get the full functionality of the canon macro flash. Unfortunately I do not remember the details and have never tried it myself. I hope somebodyelse can give you more info.
p.1 #4 · Canon Macro Flashes for Sigma 105mm macro?
Actually, I played with a Canon macro-ring with a Sigma 105mm. Although the Sigma lens doesn't have the same groove as the Canon lens, the ring flash's retention clips still held the flash firmly on the lens. It was not necessary to use any additional adapter. Just remember you have to use the expensive EX-series of macro flashes to work with your 10d...the older ones don't have any manual trigger and only fire in TTL mode, which the 10d cannot use.
p.1 #5 · Canon Macro Flashes for Sigma 105mm macro?
The adapter ring you need is the "macro-lite 58C adapter". They also make adapters in 72mm, and possibly some other sizes. When using these adapaters with the MT-24 (the macro flash with two small adjustable lights), the unbalanced weight of the two lights tends to cause the adapter to unscrew and let the two lights flop over to the side. Not fatal, but annoying.
I use one of the 72C adapters with my Canon 180mm. Occasionally I use a 58C adapter and a 55-58mm ring to mount the flash on my cheapo vivitar 100mm macro, and it works fine. I'm sure it would do similar with a Sigma lens. I do feel ludicrous about walking around with a $600 flash on my $150 lens, though!
p.1 #6 · Canon Macro Flashes for Sigma 105mm macro?
Thank you all guys for the tips, I guess I'm going to look for that MT-24EX next time I go to NYC... and the adapter ring just in case... I suppose they might allow me to test it in-store... we'll see.
p.1 #7 · Canon Macro Flashes for Sigma 105mm macro?
Hi Carlos,
I've used the Sigma 105-2.8EX together with the MT-24EX and i will advise you stongly to buy the ringlight 58C adaptor or the Cokin A type 58mm adaptorring. (this is the ring you will have to use when you are going to attach the Cokinfilterholder to a lens with 58mm filtersize.) I used this last combo and it workes fine. I even use this solution with my new Canon 100-2.8 USM macro. In this case i can leave the protecting UV filter on the lens with on top of it the Cokin adaptorring and fixed to this the MT 24 flash. The problem with the Canon 100-2.8 USM is that you'll have to remove the UV fliter first before placing the MT 24 flash. For the filter another option is to place the filter on top of the MT 24 flash but i don't like this solution because when you remove the flash the fliter doesn't protect the lens anymore and you'll easely get sticky fingers on the filtersurface.
p.1 #8 · Canon Macro Flashes for Sigma 105mm macro?
hornbill wrote:
Hi Carlos,
I've used the Sigma 105-2.8EX together with the MT-24EX and i will advise you stongly to buy the ringlight 58C adaptor or the Cokin A type 58mm adaptorring. (this is the ring you will have to use when you are going to attach the Cokinfilterholder to a lens with 58mm filtersize.) I used this last combo and it workes fine. I even use this solution with my new Canon 100-2.8 USM macro. In this case i can leave the protecting UV filter on the lens with on top of it the Cokin adaptorring and fixed to this the MT 24 flash. ...Show more →
Actually, you need to leave the UV filter fitted (or use another 58mm filter ring without any glass) otherwise the lugs on the Macrolite - the MR14EX at least - cannot engage properly behind the Cokin adapter.
p.1 #9 · Canon Macro Flashes for Sigma 105mm macro?
Dear Chris,
The Cokin 58mm adaptorring has a groove of its own, so the lugs don't grip behind the ring but into the groove of the adaptorring. Using the Sigma 105-2.8EX with or without UV-filter doesn't make any difference when you are fixing the MT-24EX flash with use of the Cokin adaptorring.
p.1 #10 · Canon Macro Flashes for Sigma 105mm macro?
hornbill wrote:
Dear Chris,
The Cokin 58mm adaptorring has a groove of its own, so the lugs don't grip behind the ring but into the groove of the adaptorring. Using the Sigma 105-2.8EX with or without UV-filter doesn't make any difference when you are fixing the MT-24EX flash with use of the Cokin adaptorring.
It must be a different ring to the one I have then - mine screws right up to the front edge of the lens and has no groove.
Unless the lens outer diameter is smaller than the larger diameter of my adapter ring, it leaves very little (if anything) for my MR14-EX to grip. Hence, I use an empty 58mm filter ring as a spacer.
p.1 #11 · Canon Macro Flashes for Sigma 105mm macro?
Dear Chris
Cokin must have more than one type of 58 mm A- type adaptorring. I have two of them and both are the same and provided with a groove. Maybe Cokin made a modification on this ring so that older or newer ones will be not the same. I can't say if i have old or new ones because the first i bought 15 years ago, but the second one about one year ago.
p.1 #12 · Canon Macro Flashes for Sigma 105mm macro?
hornbill wrote:
Dear Chris
Cokin must have more than one type of 58 mm A- type adaptorring. I have two of them and both are the same and provided with a groove. Maybe Cokin made a modification on this ring so that older or newer ones will be not the same. I can't say if i have old or new ones because the first i bought 15 years ago, but the second one about one year ago.
Hmm, they must have - mine was also bought about a year ago, in the UK. My P-series 77mm is just the same, no groove.
I can see the advantage of a grooved one for the Cokin holders as well as fitting a macrolite, as it gives a little more room for the hlder to rotate.
