> the design of new software and a USB docking station that will enable photographers to update and adjust their lenses to suit their personal preferences.
lara_ckl wrote:
Any reviews of the _current_ model?
Search the forums, there have been some threads. My take (I had it for a few days). Excellent sharpness, stabilization, AF speed. People have said that AF tracking is not so good; I did not notice a problem but I am not a pro sports shooter.
Only works with Sigma TC which are optically not great and so bring the IQ down noticeably.
I am kinda interested in picking one of the new 120-300/2.8 OS up, it looks sweet, I had the older version before, decent lens, sold it, I don't have anything other than Nikon lenses, I am interested in getting a 120-300/2.8 OS to try out. Does anyone know if the 35/1.4 is for FX?
now, from a computer nerd standpoint, I wonder if its possible to 'overclock' in a sense, the AF speed of the sigma lenses. Some might say its stange, but thinking about it, it just may be possible to squeeze out a little more performance if they give us the tools.
Overclocking PC components involves changing the clock frequency of the CPU, GPU and memory. Not sure there are any CPU's that govern the speed of AF in a lens. I would assume that the speed of AF is limited by things like the weight of the actual elements that need to be moved around and the strength of the motors doing the moving.
Also, I have no problems with upping the volts on my I7 970...can't say the same about a camera lens/body.
DTOB wrote:
Overclocking PC components involves changing the clock frequency of the CPU, GPU and memory. Not sure there are any CPU's that govern the speed of AF in a lens. I would assume that the speed of AF is limited by things like the weight of the actual elements that need to be moved around and the strength of the motors doing the moving.
Also, I have no problems with upping the volts on my I7 970...can't say the same about a camera lens/body.
overclocking is simply increasing the mhz and/or voltage the component run at. CPU, GPU and memory are all seperate modules, and thus in any given system, can be overclocked seperately.
I'm going out on a limb to guess that maybe the motor of the lens can be tweaked a bit, as well as the software. Now I'd realy love to get my hands on one of these lenses with the usb dock...
Dunno, it's quite possible that the focusing motor is set to draw a certain amount of current..and if you have a higher end body, you might be able to allow it to draw more, speeding up focusing. Some lenses on Canon side will focus faster on a 1d, due to the extra power the larger batteries can supply *supposedly*. Unlikely, though, lol.
woos wrote:
Dunno, it's quite possible that the focusing motor is set to draw a certain amount of current..and if you have a higher end body, you might be able to allow it to draw more, speeding up focusing. Some lenses on Canon side will focus faster on a 1d, due to the extra power the larger batteries can supply *supposedly*. Unlikely, though, lol.
thats pretty much exactly what I was thinking, question is, who's going to be brave enough risking frying their new $1000 lens...lol
BenV wrote:
thats pretty much exactly what I was thinking, question is, who's going to be brave enough risking frying their new $1000 lens...lol
Well, putting the lens on a D4 over say a D7000 isn't what I would call 'overclocking'.
I doubt there is much you can do to a lens via a USB dock that will make it pull more power from the camera, thus speeding up the AF. I could be wrong.
BTW, with about 20 years worth of PC overclocking under my belt, I have no worries pushing electronics out of spec. If OC'ing cameras were feasible, I would certainly give it a go.
Sigma may be putting out some nice glass as of late, but I can't stand their lens release strategy. Why do they feel the need to keep releasing a new "redesigned" lens every 1-3 years? Seriously, why did they redesign the 120-300/2.8 OS? The last one was released in 2011!!! The new 17-70 OS was just redesigned in 2009. The 35/1.4 is a new lens (yay!) but who wants to bet me they won't release a "redesigned" 50 and 85 within the next year? Its stupid. They make every lens of theirs a disposable item. Resale value goes completely down the drain and they make themselves look like they have no confidence in the longevity of their products.
Granted they may make a couple specialty lenses that no one else does, but I think I'm done buying Sigma from now on.
Tommy_D wrote:
Sigma may be putting out some nice glass as of late, but I can't stand their lens release strategy. Why do they feel the need to keep releasing a new "redesigned" lens every 1-3 years? Seriously, why did they redesign the 120-300/2.8 OS? The last one was released in 2011!!! The new 17-70 OS was just redesigned in 2009. The 35/1.4 is a new lens (yay!) but who wants to bet me they won't release a "redesigned" 50 and 85 within the next year? Its stupid. They make every lens of theirs a disposable item. Resale value goes completely down the drain and they make themselves look like they have no confidence in the longevity of their products.
Granted they may make a couple specialty lenses that no one else does, but I think I'm done buying Sigma from now on.
Who cares if they release a new model? Car manufacturers do it every single year. I buy lenses to use...I give zero thought as to what a new model might do to my resale value.
