C100: Sigma to complement 18-35mm f1.8 Art with new 50-100mm f1.8 Art

That's a very loaded question, and as I say, I haven't spent much time with it yet. It's about the fastest 100mm lens on the planet. It looks nice, and it plays well with the C100. The lack of stabilization is a bit of an issue, especially considering the weight.
 
Well Done Sigma, its the sharpest lens ever made for crop sensor cameras. Check this test from Lenstip

http://www.lenstip.com/473.4-Lens_review-Sigma_A_50-100_mm_f_1.8_DC_HSM_Image_resolution.html

Image resolution on 18-35 Art:

http://www.lenstip.com/374.4-Lens_review-Sigma_A_18-35_mm_f_1.8_DC_HSM__Image_resolution.html

I think its huge improvement, but 50-100mm is more expensive than 18-35mm :/

We just need Tokina 14-20mm f2 and you dont need to worry about light :D

Test of this Tokina : http://www.lenstip.com/index.php?test=obiektywu&test_ob=470
 
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michasacuer said:
Well Done Sigma, its the sharpest lens ever made for crop sensor cameras. Check this test from Lenstip

http://www.lenstip.com/473.4-Lens_review-Sigma_A_50-100_mm_f_1.8_DC_HSM_Image_resolution.html

Image resolution on 18-35 Art:

http://www.lenstip.com/374.4-Lens_review-Sigma_A_18-35_mm_f_1.8_DC_HSM__Image_resolution.html

I think its huge improvement, but 50-100mm is more expensive than 18-35mm :/

We just need Tokina 14-20mm f2 and you dont need to worry about light :D

Test of this Tokina : http://www.lenstip.com/index.php?test=obiektywu&test_ob=470
Click to expand...

Those are some really good, and really unbiased reviews of the Sigma zooms.
Looks like we've got ourselves another winner.

Thanks for posting these.
 
I've done a few tests with this lens now. If you have the 18-35, it feels the same. But much larger. For video, it has a number of positives. Nice long focus throw. It doesn't lose light while zooming when stopped down, which automatically makes it better than the Canon L zooms. Unlike the 18-35, however, it has a massive amount of breathing. You might actually think you've grabbed the wrong ring when you start focusing. Racking focus on stagnant shot is not going to be pleasing. Also, the 50-100 was not perfectly parfocal on either my 1DC or my C100. Both cameras lost focus to the same degree and in the same direction while zooming. I tried two copies of the lens and both acted exactly the same way. I added a spacer and the lens and it is now parfocal on my cameras. The lens has a couple of spacers already inside the mount, so it is possible to adjust the backfocus if you are motivated enough.
I'm guessing that I will be using the 18-35 and 50-100 together for low light events and for two camera interviews in tight spaces in which the client wants a low depth of field. I do a lot of those, so the 50-100 is going to be very useful. It complements the 18-35 perfectly. Both have the same color and the same amount of light transmission. I never felt that the 18-35 matched my Canon L glass very well, so owning the 50-100 actually makes me more likely to use the 18-35.
 
So, I decided to do a test of the focus breathing to get a sense of the actual zoom range. I tested it against the stm zooms as a reference.

At infinity focus, the 50-100 f/1.8 corresponds to 50-100. At close focus of about 3ft, it corresponds to 75-150. At a focus of about 5ft, it corresponds to about 60 to 120. Sigma made a massive compromise on focus breathing to make this lens work.
 
BTW: I just stuck a Sigma 50-100/1.8 Art on my C300mk2 and everything worked. Autofocus, Face Detection, Iris, Peripheral Illumination Correction, Chromatic Aberration Correction. Wasn't very thorough, but it's nice to see that the lens is useable on a C300mk2. Unlike the last two Art lenses from Sigma (20/1.4 & 24-35/2.0) that don't work at all on the C300mk2. I'll try again after the July firmware update for the C300mk2.

Sorry if this was already posted to this forum.
 
hey parrot, i assume the autofocus works on the 18-35mm sigma as well? i am curious, since it works on some sigma lenses, i assume it would work on 'some' other canon mount lenses like zeiss or tokina? do you have these lenses to try out? and correct me if i am wrong, but only lenses with auto focus would work right? manual lenses with canon adapter is out of the question?

btw i don't know if this was mentioned before, but let's say you want to switch your EF to PL mount, you send it in to the canon service center, and pay a fee; does canon send the EF parts back to you so that you can perform it yourself next time? (meaning you can switch back from PL to EF on your own?) is it just a one time thing or everytime you want to switch you have to send it to canon for them to do it?
 
Amira-user said:
hey parrot, i assume the autofocus works on the 18-35mm sigma as well? i am curious, since it works on some sigma lenses, i assume it would work on 'some' other canon mount lenses like zeiss or tokina? do you have these lenses to try out? and correct me if i am wrong, but only lenses with auto focus would work right? manual lenses with canon adapter is out of the question?

btw i don't know if this was mentioned before, but let's say you want to switch your EF to PL mount, you send it in to the canon service center, and pay a fee; does canon send the EF parts back to you so that you can perform it yourself next time? (meaning you can switch back from PL to EF on your own?) is it just a one time thing or everytime you want to switch you have to send it to canon for them to do it?
Click to expand...

So far Sigma 18-35/1.8 Art works on C300mk2, including AF.
Most other 3rd party lenses work, but some don't.
I haven't tried any lenses with EF adapters where the AF or Manual Focus Assist works, yet. I don't have many EF adapters to try with, though! It's possible that some might work. If lens has mechanical iris it will allow you to select iris regardless of any firmware incompatibilities, of course.

Switching between EF & PL is a shop visit, so service fee is every time. You buy the mount(s), so as long as you don't loose any parts you don't pay for the mount again each time.
 
cpreston said:
I added a spacer and the lens and it is now parfocal on my cameras. The lens has a couple of spacers already inside the mount, so it is possible to adjust the backfocus if you are motivated enough.
Click to expand...

How do you add spacers and adjust back focus to make a lens parfocal?
 
Man if only this and the sigma had an aperature ring on the nikon mount version, Those would be the only two lenses I would need to carry for 90% of my shots with the F3.
 
Sumfun said:
How do you add spacers and adjust back focus to make a lens parfocal?
Click to expand...
Me? I bought some scientific/industrial spacers that were the same inner and outer diameter as the mount and also as thin as I could find. I don't remember where I found them online. And then I drilled holes for the mounting screws and cut off any extra area around the inside or outside of the spacer that was hitting the iip of the mount, sanded the spacer to get rid of edges from the cutting, and then slid the spacer in underneath the mount. On the Sigma, 50-100, there is already a spacer installed so there are actual OEM spacers being manufactured, but I don't know how you would order one outside of buying an extra 50-100 and stealing its spacer..
 
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