Search results for 'back focus' - page 2795
Boris
He came back by , on Flickr Probably my favourite little spider
Posted by 08tiger on 11/04/2012 - 07:43
Some macros with the Vivitar 100mm
Here are a few macros with the Vivitar 100mm that arrived today. I'm not convinced it's any sharper than the 50mm prime and tube setup I've been using, but the additional distance from the subject is helpful as is the slightly larger focus throw. Using a 12mm manual extension tube to enable catch in...
Posted by milamber on 11/04/2012 - 16:26
Weevil Beetle
Lovely little critter. It does look very much like a Vine Weevil, in which case "lovely little critter" doesn't apply, believe me. :shock: "Horrible little pest which will destroy all your pot-plants" is more like it :wink: The adult beetles don't do much harm - just munch on the leaves. The pro...
Posted by WobblyGoblin on 12/04/2012 - 10:58
Sigma IQ Expectations...
I also own the Sigma 150-500 and am very pleased with the IQ obtained with it. I doubt if the body used has any relevance, I have used mine on the K10, K20 and K5 with no discernable difference. The sharpness of your picture is certainly not what I would expect from this lens but you do not say at ...
Posted by cbrog on 14/04/2012 - 15:37
Sigma IQ Expectations...
Thanks, Roger. This is from 10m away. K7. Tripod. Manual focus (v. carefully!) on the junction of the post & the top rail. OS off. 1/200th. F6.3. ISO 400. Mirror-up. Remote release F. [/img] I don't believe this is sharp (enough). Notwithstanding the noise, this is more what ...
Posted by coker on 14/04/2012 - 16:38
Sigma IQ Expectations...
Do the same test but focus with live view.
Posted by Mike-P on 14/04/2012 - 17:15
Sigma IQ Expectations...
As my previous post, but focussed using live view. (JPEG straight from the camera, no PP.) Certainly not as easy to focus using l/v, since I always use the OME-35 magnifier when using the viewfinder. I can't discern any difference..... Can you, Mike? Can anyone? Am I any further ...
Posted by coker on 15/04/2012 - 14:44
Sigma IQ Expectations...
I always use contrast AF live view to check critical focus on a lens as you can zoom in to make sure you have it spot on. Anyway, as to your lens question ... you are shooting wide open at 500mm so I wouldn't expect fantastic IQ (the big Sigmas prefer f8 ) but I would hope for something better th...
Posted by Mike-P on 15/04/2012 - 16:42
Sigma IQ Expectations...
Thanks for your time & advice, Mike. I'll ring Chris at SRS tomorrow & see what the procedure is. :cry::cry::cry::cry: Thanks also for the pointer to AF Contrast focus in live view, with the ability to zoom-in to check focus. This sounds very handy for macro! Thanks again, all. Ro...
Posted by coker on 15/04/2012 - 17:27
Sigma IQ Expectations...
Am sticking with the testing, etc. But I'm beginning to have more doubts re this lens/my K7 combination. Particularly having seen David Robinson's Kestrel post on The Gallery & his other 150-500 images on his website). Just a thought... could the fact that the K7 is still on ver. 01 firmware h...
Posted by davidrobinson on 15/04/2012 - 22:30
Sigma IQ Expectations...
Hi Roger, certainly looks like a problem. Maybe focus needs adjusting for this lens?
Posted by Blythman on 15/04/2012 - 22:55
Sigma IQ Expectations...
roger before you return it do try a higher shutter speed ,also try it on my camrea as well before you send it back.brian
Posted by brianfromwilts on 16/04/2012 - 20:54
Sigma IQ Expectations...
Out this afternoon in pretty good light. K7, 150-500(again!) ISO 800, 1/800th. @f8. Full frame jpeg straight from camera. (Crop is on The Gallery). Spoke to SRS today. Advised to speak, initially, to Sigma for any hints/tips/advice they may have, then, if necessary, get back to SRS. ...
Posted by coker on 08/05/2012 - 21:34
Sigma IQ Expectations...
Hi Roger, certainly looks like a problem. Maybe focus needs adjusting for this lens? Hi Roger, have you tried this? If focus adjustmrent isn't off, then I think it needs to go back.
Posted by Blythman on 09/05/2012 - 14:20
Sigma IQ Expectations...
Hi, Alan. If you look at the Linnet image in The Gallery, I think you'll see that there isn't anything in front of or behind the bird that is in any better focus than the subject itself! I have checked on other images & the same applies. I'm in contact with Chris at SRS, even as we speak. ...
Posted by coker on 09/05/2012 - 15:44
Sigma IQ Expectations...
It's on its way back to Watford! R. :?
Posted by coker on 10/05/2012 - 18:31
Sigma IQ Expectations...
It's on its way back to Watford! R. :? Hi Roger Any news of your iffy Sigma lens, I have been looking at your recent uploads with other lenses and I cant see much wrong with them, I'm sure there must be something wrong with the Sigma and it's not just a focusing issue. Regards David
Posted by davidrobinson on 17/05/2012 - 11:54
Sigma IQ Expectations...
Good afternoon, David. The lens is on its way back to me, delivery today. I spoke to Chris who said a colleague had done the "brick wall" test on it, at various focal lengths & apertures. They consider it to be within acceptable standards. He offered to send it to Sigma for their testing/th...
Posted by coker on 17/05/2012 - 12:37
Sigma IQ Expectations...
Good afternoon, David. The lens is on its way back to me, delivery today. I spoke to Chris who said a colleague had done the "brick wall" test on it, at various focal lengths & apertures. They consider it to be within acceptable standards. He offered to send it to Sigma for their testing/th...
Posted by davidrobinson on 17/05/2012 - 16:40
Sigma IQ Expectations...
Thanks, David. I generally use Elements 9, which has a RAW editor "attached" Are such editors much the same? Are any/is one "better" than the others? The comment re manual focus only really referred to my macro work. Thanks again for your help, Roger.
Posted by coker on 17/05/2012 - 17:42
