Search results for 'back focus' - page 705
50-135 2.8 SDM
The 300mm DA* certainly feels faster and more accurate to me than other lenses I have at a similar length. I'm not 100% sure that it definitely is, or whether the fact that the focus is nearly silent makes it seem so, though. As George says, tracking moving objects really is an art in itself. If ...
Posted by George Lazarette on 07/04/2008 - 10:14
50-135 2.8 SDM
SDM lenses are focusing faster than non SDM lenses. For tracking a subject moving across the frame is no big deal, even for non SDM lenses. The problems arise when your subject is moving away/toward the camera. When you depress the shutter,even on AF-C, the camera will freeze the focus because th...
Posted by pentaxian450 on 07/04/2008 - 18:28
50-135 2.8 SDM
I've been doing a few shoots at courts recently, capturing naughty people going in and out, and I would say out of all the shots walking towards me 50% are out of focus, 30% are OK, 20% good. On at least one occasion whilst on AFC whilst holding the trigger down, it went about 2 seconds between s...
Posted by Unlocker on 07/04/2008 - 22:52
50-135 2.8 SDM
I've been doing a few shoots at courts recently, capturing naughty people going in and out, and I would say out of all the shots walking towards me 50% are out of focus, 30% are OK, 20% good. Someting interesting to test would be using a much faster shutter speed. A target moving towards you at f...
Posted by beakynet on 07/04/2008 - 23:09
50-135 2.8 SDM
re: owl pic My guess is that the lens was focused slightly in front of the owl and the DOF was enough to make the beak and eye sharp. EDIT: On second thoughts, the tuft of feathers in the front is slightly softer, therefore I now think the focus was spot on! Some people might have liked so...
Posted by iceblinker on 07/04/2008 - 23:38
50-135 2.8 SDM
I've been doing a few shoots at courts recently, capturing naughty people going in and out, and I would say out of all the shots walking towards me 50% are out of focus, 30% are OK, 20% good. On at least one occasion whilst on AFC whilst holding the trigger down, it went about 2 seconds between s...
Posted by pentaxian450 on 07/04/2008 - 23:39
50-135 2.8 SDM
Does SDM focus faster than non-SDM? No it doesn't! It may give that impression but SDM doesn't work faster. How come I'm so sure? Because I tested! When I got the DA*50-135/2.8 I hadn't upgraded the firmware on my K10D yet, so I tried it with traditional AF comparing it to some other screw drive AF ...
Posted by ishpuini on 08/04/2008 - 12:35
50-135 2.8 SDM
Does SDM focus faster than non-SDM? No it doesn't! It may give that impression but SDM doesn't work faster. How come I'm so sure? Because I tested! When I got the DA*50-135/2.8 I hadn't upgraded the firmware on my K10D yet, so I tried it with traditional AF comparing it to some other screw drive AF ...
Posted by Mannesty on 08/04/2008 - 14:37
50-135 2.8 SDM
Could you post some times please? A comparison between the time, in milliseconds, for a focus travel from infinity to a given point. Then the time from minimum focus distance to that same point. A measurement each for SDM and Non-SDM focussing should be enough. Light measurements would help. I...
Posted by ishpuini on 08/04/2008 - 14:57
70-300 sigma vs Tamron - test images
Have been following this thread and yesterday I tested out a Sigma 70-300 against the Tamron 70-300 and decided the Tamron was sharper though the focus was not as nippy as the Sigma (non-APO). I went home to check prices and found it seemed to average £115. Jessops price was £199! The Sigma was £...
Posted by beakynet on 11/04/2008 - 00:05
Tamron 17-50
I have just received my Tamron 17-50 which I bought as it was a keen price from SRS compared to the Pentax 16-50 which has f4 and has the 2.8 throughout the range. I found the kit lens 18-55 to be very good but I was often frustrated to be at the maximum aperture. I have just applied my standard ...
Posted by mikew on 11/04/2008 - 20:10
Tamron 17-50
I get mightily confused by images and their presentation here so what I've done is plonk a 3 meg JPEG for you to view or download at http://www.drmikewebb.com/30mm_f28_2000th.jpg I think the names show the settings, K100D mind No USM or anything other than silky defaults and develop as JPEG b...
Posted by mikew on 11/04/2008 - 22:14
Tamron 17-50
I had a very brief walk with this lens on Sunday and the focus seems fine including infinity which I have on occasions had issues with on other lenses. I had one time when it hunted badly. The spot focus was set to extreme left to get a yellow hut in focus and I think the red focus spot fell on a pi...
Posted by mikew on 14/04/2008 - 19:26
Sigma 18-200
correct me if I'm wrong....but I believe that the focal length actually changes depending on the focussing distance..... it's the mechanics of the lenses that cause this... lots of parts moving inside the lens....so closer focus actaully does change the focal length.... good explanation:
Posted by Don on 10/04/2008 - 00:51
Sigma 18-200
I had the same initial worry with the Tokina 24-200. At close focus the 200mm wasn't ;) It's just the complex lens design. Matt
Posted by MattMatic on 11/04/2008 - 10:58
Sigma 150mm macro
I doubt it's a 'new' version, apparantly it was the last one that Sigma (UK) had in stock. I guess any new version will have HSM focussing. Not much use for macro work as I only ever use manual focus. The 150mm lens is 1:2.8, the 180mm is a little slower at 1:3.5. My holy grail was a Pentax...
Posted by Mannesty on 10/04/2008 - 21:07
Sigma 150mm macro
I doubt it's a 'new' version, apparantly it was the last one that Sigma (UK) had in stock. I guess any new version will have HSM focussing. Not much use for macro work as I only ever use manual focus. The 150mm lens is 1:2.8, the 180mm is a little slower at 1:3.5. My holy grail was a Pentax...
Posted by George Lazarette on 10/04/2008 - 22:54
Sigma 150mm macro
I doubt it's a 'new' version, apparantly it was the last one that Sigma (UK) had in stock. I guess any new version will have HSM focussing. Not much use for macro work as I only ever use manual focus. The 150mm lens is 1:2.8, the 180mm is a little slower at 1:3.5. My holy grail was a Pentax...
Posted by Mannesty on 10/04/2008 - 23:31
Sigma 150mm macro
[quote:e0dcda672c="Mannesty"]I doubt it's a 'new' version, apparantly it was the last one that Sigma (UK) had in stock. I guess any new version will have HSM focussing. Not much use for macro work as I only ever use manual focus. The 150mm lens is 1:2.8, the 180mm is a little slower at 1:3.5. ...
Posted by George Lazarette on 11/04/2008 - 01:30
Sigma 150mm macro
I would need a 49-72mm step ring if i want to use my AF-080C You got me thinking sometime ago when you mentioned making a macro flash bracket but gave up when it became too cumbersome. I have a couple of dinky little AF-160 flashes and decided to make a bracket to hold these. (Not sure if these...
Posted by Mannesty on 12/04/2008 - 00:08
