imagesfromobjects wrote:
Yeah, it totally sucks. I've actually only ever owned a couple AF lenses, is this a thing that happens occasionally? Lens was perfect.
Glad it happened now and not earlier today. Or worse - past the return/warranty window.
yes, for sure. This happened with me before with a Batis, a Sony RX1R II and a Samyang AF lens. I think it's very rare but it does happen.
Ok, good to know. Just weird. Literally fine one minute and the next it's dead, just stuck. Would be understandable had I dropped it or whatever, but I was just sitting on the couch.
Anyway, here's to a smooth return and a better second copy!
imagesfromobjects wrote:
[...]
It's still transmitting the data- the distance scale moves when in MF mode, but the focus doesn't move
[...]
So the focus distance scale is not based on feedback from the focus group lenses (where the focus actually ended) but likely on the stepper motor theoretical position?. What amount of crapness in current focus by wire designs... If at least they'd give us the option for (+) and (-) buttons to accurately actuate it...
Does Sigma make new lenses only for a specific camera or cameras but they dont make it available for their own camera's?
I just got a Sigma DSLR and one would think that they would make every new release for their own as well as well as for Sony, Canon, Nikon, etc.
billsamuels wrote:
Does Sigma make new lenses only for a specific camera or cameras but they dont make it available for their own camera's?
I just got a Sigma DSLR and one would think that they would make every new release for their own as well as well as for Sony, Canon, Nikon, etc.
As far as I know they always make lenses for more than just 1 mount. For the Sigma 45 it is L and E mount.
Since it is a lens designed for mirrorless, Sigma cannot make it available for DSLRs.
I'm going to test it on one of my friends' cameras tomorrow (a7III's) and see what the deal is.
In the meantime, I've written Sigma and thought I should post it here for reference, or if anyone else is experiencing this bug. I no longer believe it is the focus motor.
.......
[Email to Sigma]
Hello-
I'm hoping you can help me with an issue I've been having with the Sigma 45mm f/2.8 DG DN Contempoary for Sony.
Briefly - I'm using on Sony a7S. The lens focus has simply stopped working. There is *no* autofocus movement and no manual focus movement happening in the lens. The lens is still communicating with the camera, because I'm able to change the aperture from the camera, and the digital distance scale will move when the ring is turned when in manual focus- but the focus will not actually change.
I tried cleaning the contacts, charging the batteries, performing a factory reset on the camera, switching between every different type of focus mode.... nothing.
Here's the best part- I just actually returned a 3-day old lens I purchased from Adorama because of THIS SAME THING. The only conclusion I could come to at the time, was that the focus motor inside the lens had broken. BUT... the same thing happened on the replacement they just sent me. Two days worth of happy shooting, now it's a brick.
I really don't understand what is happening and I'm incredibly frustrated. I want SO BADLY to love this lens, and indeed I do - or did, while it was working - but now I can't use it. During the Holidays, when I have multiple professional as well as family events to shoot, no less.
I will be (very sadly) returning this lens as well. I can only assume that there is some software glitch happening between my camera and this lens that's causing this, but that's not my area of expertise. I don't know if others have reported a similar issue, either - but I hope it's brought to the attention of the - BRILLIANT - team behind the design of this lens, because it's kinda important if it's systemic, rather than just an isolated glitch.
If you have any suggestions, I'd love to hear them. I'll happily provide my [vendor] order information as well as any documentation that would help.
I'm going to test it on one of my friends' cameras tomorrow (a7III's) and see what the deal is.
In the meantime, I've written Sigma and thought I should post it here for reference, or if anyone else is experiencing this bug. I no longer believe it is the focus motor.
.......
[Email to Sigma]
Hello-
I'm hoping you can help me with an issue I've been having with the Sigma 45mm f/2.8 DG DN Contempoary for Sony.
Briefly - I'm using on Sony a7S. The lens focus has simply stopped working. There is *no* autofocus movement and no manual focus movement happening in the lens. The lens is still communicating with the camera, because I'm able to change the aperture from the camera, and the digital distance scale will move when the ring is turned when in manual focus- but the focus will not actually change.
I tried cleaning the contacts, charging the batteries, performing a factory reset on the camera, switching between every different type of focus mode.... nothing.
Here's the best part- I just actually returned a 3-day old lens I purchased from Adorama because of THIS SAME THING. The only conclusion I could come to at the time, was that the focus motor inside the lens had broken. BUT... the same thing happened on the replacement they just sent me. Two days worth of happy shooting, now it's a brick.
I really don't understand what is happening and I'm incredibly frustrated. I want SO BADLY to love this lens, and indeed I do - or did, while it was working - but now I can't use it. During the Holidays, when I have multiple professional as well as family events to shoot, no less.
I will be (very sadly) returning this lens as well. I can only assume that there is some software glitch happening between my camera and this lens that's causing this, but that's not my area of expertise. I don't know if others have reported a similar issue, either - but I hope it's brought to the attention of the - BRILLIANT - team behind the design of this lens, because it's kinda important if it's systemic, rather than just an isolated glitch.
If you have any suggestions, I'd love to hear them. I'll happily provide my [vendor] order information as well as any documentation that would help.
I am using the sigma on a first gen A7 and have had some quirks as well. The lens focuses fine, but at first I thought it was decentered. I did several tests comparing it against another 50, and I found myself getting inconsistent results. Some images were sharp at all corners, others had a soft corner or two. After scratching my head a bit, I came to the conclusion that it’s likely a combination of the sigma’s weather sealing gasket and the weak leaf springs in the mount of the original A7. The gasket extends a little past the base of the mount, and pushes the lens away from the body, albeit inconsistently. This same situation may be also be connected to your issue with the lens not communicating with the camera.
Dec 16, 2019 at 07:26 AM
imagesfromobjects Offline • • • • Upload & Sell: Off
I'm going to troubleshoot a few different avenues before I send it back. Before it crapped out completely, it crapped out for a minute, then I changed the battery and it worked again. So I thought it may be related to a low battery unable to power the focus motor. But won't work even with batteries at 100%. I suspect strongly that it's software related. It happened shortly after changing focus modes. The first time, when I switched from manual to autofocus, the second time, shortly after I switched from face detect on (which worked very well, btw) to off.
At my wits' end here. A lot of stuff coming up I wanted to use this lens for.
It may also be related to the 1st generation cameras, as I doubt they were beta testing on those. May be upgrading to a Sigma fp sooner than I'd anticipated, but I hope that Sigma has a firmware fix in the works, if it is a compatability bug.
keepcoding wrote:
Maybe your camera is overwhelmed by the images this lens produces and can't handle it anymore
No seriously, either you are very unlucky with this lens or there is a compatibility issue with your camera
Either way, keep us in the loop!
I do, original a7S. The first time, I was switching mf/af on the camera (not the lens) and two minutes later it was dead. This time, I avoided using that, but shortly after I switched from "face detect on" to "off" it died.
I'd suggest only using the mf/af switch on the lens, if you are at all nervous about it.
I'm going to do another factory reset and I have brand-new batteries on the way here. Some time this week, I'll be trying it on my friend's a7III, hoping one of those gets it working again.
sergun wrote:
Do you have a first-generation camera ? I have R2 and, too, under a change of AF/MF occurred hiccup. It says "turn off camera" but that was one time.
