Review - Sigma 24-105mm f/4 DG OS
- Thread starter Canon Rumors
- Start date
photo212 said:
Hey, no weather sealing, not to mention the double-barrel zoom makes an extra area "exposed" for potential element influx. I don't think Sigma has an "All weather" rating, and neither does Canon (not even all the white L lenses are weather sealed).
Upvote
0
neuroanatomist said:
I experienced some Sigma focus shift today in fact. I was a bit perplexed when I was using LV to manually focus the 50mm at f/4, and when I took the shot it was slightly off. The 24-105L didn't have this issue. Is this due to the fact that when focusing the aperture is wide open at f/1.4 on the Siggy and f/4 on the Canon? That is kinda useless then if using LV. Makes AF accuracy even more important.
Upvote
0
Re: Review - Sigma 24-105mm f/4 OS
Please accept my apologies for my last comment, it was harsh and rude; I appreciate anyone who takes the time to post a review and take the flak for it!
I wouldn't expect anyone who isn't properly set up for it to attempt quantitative testing, nor given the number of technical review sites available, would I feel the need for it. I would prefer to see you use large crops from photos taken in your professional style, like the photos that you used to illustrate the review, to demonstrate your points.
I won't mention the name of the website that uses the "bookshelf-of-doom" to "show" lens "sharpness", suffice to say that I don't put any credence in their reviews!
JVLphoto said:
Please accept my apologies for my last comment, it was harsh and rude; I appreciate anyone who takes the time to post a review and take the flak for it!
I wouldn't expect anyone who isn't properly set up for it to attempt quantitative testing, nor given the number of technical review sites available, would I feel the need for it. I would prefer to see you use large crops from photos taken in your professional style, like the photos that you used to illustrate the review, to demonstrate your points.
I won't mention the name of the website that uses the "bookshelf-of-doom" to "show" lens "sharpness", suffice to say that I don't put any credence in their reviews!
Upvote
0
L
Loswr
Guest
Zv said:
It has to do with the lens design, not the max aperture (although when focus shift affects a lens, it's usually more evident with a faster lens). AF is always done wide open - the thing about focus shift is that the lens is the shift occurs when the lens is stopped down, which happens after AF is complete. It doesn't matter if focus is live view or phase detect, the problem is there. In live view, you can hold the DoF preview button and focus manually to avoid the issue.
Upvote
0
tomscott said:
Nope, they are very close, distortion is a bit different at 24mm and the real difference are seen at the 100% crops. Even then it's not quite the res you need. See below (hope they help).
https://dl.dropboxusercontent.com/u/12373943/Canon%2024-105%20-%2024mm%20f4.jpg Canon 24-105 f/4 IS (at f/4) 9.8MB
https://dl.dropboxusercontent.com/u/12373943/Sigma%2024-105%20-%2024mm%20f4.jpg Sigma 24-105 f/4 OS (at f/4)
Upvote
0
Re: Review - Sigma 24-105mm f/4 OS
Accepted. Funny, I get flak when I don't do tests and when I do too (though the later I make no excuses for: I am not set up to do that *at all*).
And I'll definitely post more images in higher res as the day goes on. In most cases my images come processed to some point, I mean, most do right? My bookshelves are unedited though
traveller said:
Accepted. Funny, I get flak when I don't do tests and when I do too (though the later I make no excuses for: I am not set up to do that *at all*).
And I'll definitely post more images in higher res as the day goes on. In most cases my images come processed to some point, I mean, most do right? My bookshelves are unedited though
Upvote
0
Re: Review - Sigma 24-105mm f/4 OS
Both? Some of those Manga titles are... titillating
neuroanatomist said:JVLphoto said:My bookshelves are unedited though
The images or the content?
Both? Some of those Manga titles are... titillating
Upvote
0
Gah! Charts!
Not to be rude, but the review doesn't answer some of the real world questions that I, as a Canon 24-105/4 user, have.
For example, how does the Sigma perform when using the OS to stabilize the video when following a moving subject while walking and pulling focus? This is a place where the Canon does a great job, and one of the reasons so many video guys use it.
Or, when in studio doing product photography, or other industrial/catalog work, how does the Sigma perform when shooting against lit white seamless at f/8? Do the blacks wash out, or does it stay sharp? Does kick-back from a backdrop lit a stop brighter than the subject cause the Sigma to become less contrasty? Lots of product guys use the 24-105 in this situation because it performs well under these conditions. I recall both Zarias and Ukandu lady saying the Canon 24-105 is the go-to lens in these conditions in their creative Live workshops.
Not to be rude, but the review doesn't answer some of the real world questions that I, as a Canon 24-105/4 user, have.
For example, how does the Sigma perform when using the OS to stabilize the video when following a moving subject while walking and pulling focus? This is a place where the Canon does a great job, and one of the reasons so many video guys use it.
Or, when in studio doing product photography, or other industrial/catalog work, how does the Sigma perform when shooting against lit white seamless at f/8? Do the blacks wash out, or does it stay sharp? Does kick-back from a backdrop lit a stop brighter than the subject cause the Sigma to become less contrasty? Lots of product guys use the 24-105 in this situation because it performs well under these conditions. I recall both Zarias and Ukandu lady saying the Canon 24-105 is the go-to lens in these conditions in their creative Live workshops.
Upvote
0
Rey said:
Ugh, and you even specifically asked me for these. I'm the rude one for not addressing them.
To answer the video, I'm not a video shooter and any "test" I could do with it would lack any real insight into what a video shooter needs. I haven't talked about video in my other reviews because of this and held true here. I will assume that the "always on" OS being as silent as it was would suit this function incredibly well. It worked well enough for the stills.
I wanted to try the blown out backdrop, but ran out of time with the lens and had to send it away. Without testing this *specitifically* I do have a few good shots with direct light and there's still good contrast and detail. Sorry for missing this
Upvote
0
I believe the EF 24-105 is parfocal in one direction; from long to short, ie you can focus on a subject at 105 mm and then zoom out to 24 holding focus, but not the other way round. It is specifically designed this way with a compensating cam inside to keep it right. ( Another fact gleaned from CR )
Interesting on the superior corners of the Sigma, but is it perceivable at normal magnifications ? The corners are (one) of the EF 24-105's weak areas and with the 24-70 IS the difference is perceivable at realistic magnifications.
)Interesting on the superior corners of the Sigma, but is it perceivable at normal magnifications ? The corners are (one) of the EF 24-105's weak areas and with the 24-70 IS the difference is perceivable at realistic magnifications.
Upvote
0
No problem, its not like I'm going to ditch my 24-105L if the Sigma is better in these conditions (I'd rather milk every ounce of ROI from my current gear), but if I were building a kit today, I would like to know the answers to those questions.JVLphoto said:Rey said:
Ugh, and you even specifically asked me for these. I'm the rude one for not addressing them.
To answer the video, I'm not a video shooter and any "test" I could do with it would lack any real insight into what a video shooter needs. I haven't talked about video in my other reviews because of this and held true here. I will assume that the "always on" OS being as silent as it was would suit this function incredibly well. It worked well enough for the stills.
I wanted to try the blown out backdrop, but ran out of time with the lens and had to send it away. Without testing this *specitifically* I do have a few good shots with direct light and there's still good contrast and detail. Sorry for missing this
Upvote
0
L
Loswr
Guest
Sporgon said:I believe the EF 24-105 is parfocal in one direction; from long to short, ie you can focus on a subject at 105 mm and then zoom out to 24 holding focus, but not the other way round. It is specifically designed this way with a compensating cam inside to keep it right. ( Another fact gleaned from CR
Chuck Westfall stated, "There's a cam inside the 24-105mm lens that is designed to maintain an accurate focus when the lens is zoomed from tele towards wide." So, I suppose you could say it's parfocal…but I wouldn't. A truly parfocal lens remains in focus regardless of the zoom direction. Also, zooming from 105mm to 24mm, assuming you're not moving the camera, results in a dramatic increase in DoF as you zoom out. A subject at 5 m at 105mm f/4 has a DoF of approximately 0.25 m on either side of the subject…at 5 m, 24mm f/4 the DoF runs from 3 m in front of the subject to infinity behind - so, yeah, focus is maintained…no cam required. :
Upvote
0
neuroanatomist said:Sporgon said:I believe the EF 24-105 is parfocal in one direction; from long to short, ie you can focus on a subject at 105 mm and then zoom out to 24 holding focus, but not the other way round. It is specifically designed this way with a compensating cam inside to keep it right. ( Another fact gleaned from CR
Chuck Westfall stated, "There's a cam inside the 24-105mm lens that is designed to maintain an accurate focus when the lens is zoomed from tele towards wide." So, I suppose you could say it's parfocal…but I wouldn't. A truly parfocal lens remains in focus regardless of the zoom direction. Also, zooming from 105mm to 24mm, assuming you're not moving the camera, results in a dramatic increase in DoF as you zoom out. A subject at 5 m at 105mm f/4 has a DoF of approximately 0.25 m on either side of the subject…at 5 m, 24mm f/4 the DoF runs from 3 m in front of the subject to infinity behind - so, yeah, focus is maintained…no cam required. :
Yes I'd thought about the greater DoF as you zoom out from medium tele to quite an extreme wide angle. Maybe the cam still holds focus from 105 to 70 - or maybe there's no cam at all ;D Seems strange that they would go to the trouble of engineering it to hold focus one way ( the easy way ) but not the other, but perhaps in video work zooming from close up to wide is a much more frequently used technique than visa versa.
Upvote
0
Hi,
Thanks for taking the time and effort to review this lens.
If people don't like your review maybe they can do one themselves....
I've had sigma lenses before and maybe these new "Art" designated lenses are higher quality than the last generation.
However, if my Canon 24-105 lens needs to be replaced, I think I'll stick to a Canon. My previous lens was a 17-70mm and I had to replace it twice to get one that was on the money.
Sigma's new lenses do look great but the ultimate question in my head is can they back it up with robust product that continually performs in its lifetime.
Thanks for taking the time and effort to review this lens.
If people don't like your review maybe they can do one themselves....
I've had sigma lenses before and maybe these new "Art" designated lenses are higher quality than the last generation.
However, if my Canon 24-105 lens needs to be replaced, I think I'll stick to a Canon. My previous lens was a 17-70mm and I had to replace it twice to get one that was on the money.
Sigma's new lenses do look great but the ultimate question in my head is can they back it up with robust product that continually performs in its lifetime.
Upvote
0
Similar threads
