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Messages - dilbert

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Canon General / Re: Official: Sigma 24-105mm f/4 DG OS
« on: October 15, 2013, 07:54:25 PM »
Lens isn't listed on Sigma's Global site. The links directed to it don't work, and error occurs.
Perhaps they aren't ready to release it?

Given that it didn't appear on dpreview, I think that you're right about that.

But the cat is well and truly out of the bag.

Canon General / Re: Official: Sigma 24-105mm f/4 DG OS
« on: October 15, 2013, 06:16:18 AM »
honestly, the mtf doesn't impress me at all. on the other hand, based on what i've seen from sigma with their latest releases, it should be much better than any equivalents canon or nikon has to offer. my guess the price will be around 750-850$ and i really hope it will perform better than what the MTF shows, otherwise, whats the point? if it does i sure see myself getting myself a copy

one thing i dont understand though, is the A rating... a C would make much more sense

The Sigma MTF *is* better than the Canon MTF for the same zoom and the Sigma lens has less distortion. Vignetting - have to wait and see. Will be interesting to read the DxO review of it, that's for sure!

Canon General / Re: Official: Sigma 24-105mm f/4 DG OS
« on: October 14, 2013, 04:15:35 PM »
... and where are all of those who said "fake!" now? :D

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 14, 2013, 06:04:43 AM »
Then, more recently, we bought the 100-300 f2.8 is os hsm (first stabilized version), and after 4 months, we had it back to service.. the stabilizer was broken and making noise. they changed it and it is now ok.
But, 2 sigma lenses = 2 lenses back to sigma.
And, 4 canon lenses, 4 lenses without any problems.
I'm not sure I would buy a new sigma lens...

At least your lens was fixed first time around. I've had the IS stop working in one of the Canon lenses I've got. It took 3 or was it 4 trips to Canon's service department before they fixed it.

However mechanical devices such as lenses don't just spontaneously "break" ...

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 14, 2013, 04:42:09 AM »
I'm not interested in this lens, so I don't care much about this rumor. My only hope is that putting a little focusing ring at the bottom of the lens and a big zoom ring at the top, like in the Tamron 24-70/2.8 and in these pictures of the Sigma 24-105, won't become the new trend...
I can't find any good reason for that, while I can find plenty of downsides. I really don't get it.

What colour is your car?

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 13, 2013, 06:03:39 PM »
It would be an interesting lens option. Hopefully sharper than the EF 24-105/4 (and my experience with the Sigma GV lenses says that after calibration it probably would be). But at the same time bigger filters and increased weight (and possibly higher cost) would be negatives.

We've been seeing bigger front element sizes on lenses everywhere and I take this to mean that lens manufacturers recognise that with the advent of digital photography people that own *SLRs have become much more interested in IQ.

So if you want smaller lenses with the accompanying smaller filters but you don't want to compromise IQ then you need to move to m4/3.

Or in other words, it isn't possible to deliver a 24-105/f4 for 35mm cameras that is lighter, smaller and has better IQ than the existing lens.

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 13, 2013, 05:30:59 PM »
Excited about this lens, hope it's true, maybe Sigma heard (know) their ain’t going to be a 24-105 L II

I think it has been obvious for some time that Canon never intended to replace the 24-105L/f4 and the release of the 24-70L/f4 IS USM has confirmed that.

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 13, 2013, 09:34:15 AM »
NOTE: there is a shiny silver "A" on the side of the lens in the picture, meaning this is their "Art" line of lenses - the same breed as the 35/1.4 that has blown away many many people.

The IQ could be quite impressive...

If it also gets USB connectivity and can be "converted" from Canon to Nikon to Sony, it becomes a no brainer...

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 13, 2013, 09:31:29 AM »
I am sure it will be superior to the canon offering, however....do you guys think it would sell enough seeing as how the canon offering is so "cheap"?
Could they have the quality to blow it away and still keep the same "low" price?
That would be interesting to me.

Depends on how committed Canon is to the current 24-105. If Canon stop doing 24-105 kits and start doing 24-70/f4 kits (as has been suggested and rumored for a while) then that could mean Canon will eventually discontinue the lens or at the very least, the cheap 24-105 lenses that are coming from kits will dry up.

Additionally, if the IQ is there then people may just want it anyway as an upgrade from their existing 24-105 as that focal length works really well as a walk around lens.

Third Party Manufacturers / Re: Sigma 24-105 f/4 DG OS Outed?
« on: October 13, 2013, 09:28:18 AM »
The Sigma has the same focal length range & max aperture, and it extends just like Canon's. So what would make one choose it over Canon kit?

If the lens is real, the filter size could be a clue to Sigma trying to beat Canon in kit lens IQ, e.g. less vignetting & barrel distortion at the wide end & wide open.

That the filter size is larger and the lens being heavier is a big clue that Sigma are aiming to beat the Canon lens for IQ in many areas and this should not be too hard.

The only question this brings to mind is if it becomes to heavy, does it become less "ok" to walk around with it?

If it also becomes available in Nikon and Sony mounts then it will become a "must have" lens for the D800 crowd as it would likely trump the current Nikon 24-120/f4 in terms of IQ and a worthwhile addition to the gallery of available lenses for Sony owners.

EOS Bodies - For Stills / Re: dpreview: 70D Dual Pixel PDAF review
« on: October 12, 2013, 07:18:07 AM »
The test if totally flawed.  They are using f/1.8 lenses on a body without AFMA and the concluding that the OVF AF is lousy.  Gee, really?  That's why they put AFMA on the high-end bodies.  Other than that, the Dual Pixel AF is pretty impressive.
The preview is for the 70D.  It has AFMA.  Are you referring to something else?  The test was for the dual pixel live AF. 
I did not think it was flawed at all.  Phase detect AF is variable, and is not as accurate as manual focus.  You can use AFMA all day long, but in the end, there is variability.

I don't think that mackguyver even read the review because in the review, they mention in one section that they weren't using AFMA and then they go on to use AFMA (-10 for the lens they have) and then re-ran the tests they did to show the difference in accuracy/performance.

EOS Bodies - For Stills / dpreview: 70D Dual Pixel PDAF review
« on: October 10, 2013, 11:48:17 PM »

Overall, our testing makes it appear the 70D's Dual Pixel AF gives most of the speed advantage of conventional phase detection AF and most of the accuracy benefits of contrast detection, but doesn't quite manage to offer all of both.


Sadly Dual Pixel AF is only really used for single image AF or movie shooting (see the movie page to see how it does). If you need continuous autofocus with tracking, you have to use the 70D's conventional AF system.

I've gotten much better framing my shots, but I wonder if squeezing the last pixels out of your camera makes sense all the time. If I have a hard time framing a wildlife shot just right to get max. resolution, the Nikon guy next to me just shoots 24 or 36 mp and then crops some, gaining flexibility (aspect ratio, different framing) while probably not loosing much iq for usual print/screen sizes.
Thus the question: How do you do it - better safe than sorry, or go for the full "no cropping, please" experience?

With respect to framing, find books and web articles on composition.

And then sometimes I shoot knowing that I'm going to work on something in post and need more pixels around the subject than normal.

Some time ago, I've been told by an alleged pro photog that real photogs don't crop, or at least only do minor angle correction. I am wondering if this is true, or it is an old-school fairy tale from the analog age that falls into the category "real photogs don't use auto iso and only shoot in full m".

All the pro sports photographers also shoot in JPEG. Does that mean you'll now shoot in JPEG too?

If you spend 30 seconds getting the framing and angle of the picture right when you press the button, how much post time do you save yourself?

EOS Bodies - For Stills / Re: Where is the Canon 7D successor?
« on: October 10, 2013, 08:16:55 PM »
...I can't recall reading that Canon has stated the 7DmkII will be 'revolutionary' (but if you can source a publication from them, please do share!)

It was from an interview with Maeda.


Here's the (English) coverage on CR:


The English translation of that interview presented does not mention the word "revolutionary". It also doesn't say that there will be any new technologies, only that it will have innovative technologies, which could be a reference to the Dual Pixel PDAF, amongst others.

Is there another interview where someone from Canon uses the word "revolutionary" with respect to technology that will be in the 7D2?

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