Sigma officially launches the RF 18-50mm f/2.8 DC DN Contemporary

[neuroanatomist]

wow, no full frame Sigma.

And this surprises you for what reason?

 

[Quack]

Sigma doesn't need to change their naming scheme, they just have to replace almost every 'RF' mention with 'RF-S'.

So obviously correct that I can't believe everyone doesn't get it. A no-brainer if there ever was one.

 

[mdcmdcmdc]

Sigma doesn't need to change their naming scheme, they just have to replace almost every 'RF' mention with 'RF-S'.

RF-S isn't a mount type. It's Canon's designation for crop-only RF lenses, just like DC is Sigma's designation. It might be trademarked by Canon as well.

This isn't the same as EF versus EF-S, which were different lens mounts (EF-S lens wouldn't physically fit onto a full frame EF camera without modification). And, as I recall, none of the third parties who made crop EF DSLR lenses (including Sigma) called them EF-S. But attentive buyers knew.

 

[DJL329]

I already own the Canon 18-150 so I'm much more interested in the 10-18 than in the 18-50.

B&H has the RF-S 10-18mm listed as $199. The page says it's a $30 discount off the $329 retail price, which should be $299, so there's a typo somewhere! I put it in my cart to check and it was still listed as $199!

https://www.bhphotovideo.com/c/product/1793387-REG/canon_rf_s_10_18mm_f_4_5_6_3_is.html

If that doesn't work, Canon has refurbished copies on sale, also for $199.

https://www.usa.canon.com/shop/p/refurbished-rf-s10-18mm-f4-5-6-3-is-stm

 

[neuroanatomist]

B&H has the RF-S 10-18mm listed as $199. The page says it's a $30 discount off the $329 retail price, which should be $299, so there's a typo somewhere! I put it in my cart to check and it was still listed as $199!

https://www.bhphotovideo.com/c/product/1793387-REG/canon_rf_s_10_18mm_f_4_5_6_3_is.html

If that doesn't work, Canon has refurbished copies on sale, also for $199.

https://www.usa.canon.com/shop/p/refurbished-rf-s10-18mm-f4-5-6-3-is-stm

Pretty sure @Bob Howland was referring to the Sigma 10-18mm f/2.8, not the Canon 10-18mm f/variable&slow.

 

[DJL329]

Pretty sure @Bob Howland was referring to the Sigma 10-18mm f/2.8, not the Canon 10-18mm f/variable&slow.

Ah, thanks!

 

[shadowsports]

Patent or trademark reasons, likely so. Sigma and Tamon may not be able to call their lenses RF / RF-S in the name, but they can say for Canon RF-S or RF (eventually).

 

[bbasiaga]

wow, no full frame Sigma.

all that was announced were crop sensor lenses. Probably another year or two before we see any FF ones.

 

[TinTin]

Sigma doesn't need to change their naming scheme, they just have to replace almost every 'RF' mention with 'RF-S'.

Exactly!

And, I don't see how the "RF-S might be trade-marked" argument can be true, either. After all, Sigma is calling the lens RF... So RF-S is trade-marked, but RF isn't??

 

[riker]

Well, better than nothing, but only by a tiny bit
I need ff ART and SPORT series.

 

[Brown]

Is it internally focusing?

 

[mdcmdcmdc]

Exactly!

And, I don't see how the "RF-S might be trade-marked" argument can be true, either. After all, Sigma is calling the lens RF... So RF-S is trade-marked, but RF isn't??

No, per the press release, Sigma is calling it the "SIGMA 18-50mm F2.8 DC DN |Contemporary for the Canon RF Mount System."

The CR headline calls it the "RF 18-50mm f/2.8 DC DN Contemporary", but that's not from Sigma.

 

[blurryeyedbeast]

The lens mount incorporates rubber sealing to protect the mount from dust and water drops.

This highlights what the photography industry is really missing: IP rating numbers, or a new scheme for equipment.

My iPhone has an IP rating of 68, but my camera? Crickets.

 

[WoodyWindy]

Nah, the guy they used for the example images just happened to have an R5 and they used his beat up camera for the images. (nothing wrong with a beat up camera)

The R5 might also have been used because it is somewhat larger, relative to the APS C bodies, and therefore emphasizes the compactness of the lens.

 

[TheVolvonator]

Is it internally focusing?

I think all Sigma mirrorless lenses are internally focusing just like most newer Sony, Panasonic, Olympus/OM System, and Fujifilm lenses. The external focusing of so many of the RF lenses was a shock when I switched to Canon.

But this lens, specifically, yes.

 

[DhlcadR6]

The R5 might also have been used because it is somewhat larger, relative to the APS C bodies, and therefore emphasizes the compactness of the lens.

R5 4k60 is not oversampled, but in crop mode it’s, so using R5 with this lens is sensible. And mitigates overheating.

 

[photophil]

I think all Sigma mirrorless lenses are internally focusing just like most newer Sony, Panasonic, Olympus/OM System, and Fujifilm lenses. The external focusing of so many of the RF lenses was a shock when I switched to Canon.

Does make the lenses a lot smaller though when they are not in use. Especially on the half macros, since the focus group has to be moved so far between infinity focus and MFD. Having that distance covered by the lens' chassis would make it very significantly longer.

 

[koenkooi]

Does make the lenses a lot smaller though when they are not in use. Especially on the half macros, since the focus group has to be moved so far between infinity focus and MFD. Having that distance covered by the lens' chassis would make it very significantly longer.

Or, in Canons case, make the lenses have massive focus breathing. The 100mm macros become a lot shorter in focallength at MFD.

 

[photophil]

Or, in Canons case, make the lenses have massive focus breathing. The 100mm macros become a lot shorter in focallength at MFD.

I thought that was a general thing with macro lenses that can also focus on infinity. Is it not?

 

[koenkooi]

I thought that was a general thing with macro lenses that can also focus on infinity. Is it not?

Mostly for internal focusing lenses, the extending ones (Canon 50, Sigma 70) suffer a lot less from it.
And you can judge the amount of extension needed from looking at the MP-E 65mm