Search results for 'back focus' - page 1156
sigma vs Tammy 70-300 vs Pentax da 50-300
I've had the Tamron (F4-5.6 LD Di Macro) and the Pentax. The Tamron is very good value for money, and the macro capability is pretty good, but as Karlo noted, better for stationary subjects than those on the move. However, the image quality is not as good as the Pentax, and the difference is worth...
Posted by swarf on 19/04/2015 - 18:01
sigma vs Tammy 70-300 vs Pentax da 50-300
I've got both the tamron 70-300 LD Di and the pentax 55-300 WR and had the Sigma 70-300 APO, without a doubt the Tamron is the best at AF. The pentax is so disappointing at AF that I've started using it in manual focus for birds in flight shot. Here's one that was taken with the Tamron that I just c...
Posted by walt on 20/04/2015 - 23:49
sigma vs Tammy 70-300 vs Pentax da 50-300
My only contribution is that I have an old Sigma 70-300 Apo Super (circa 2000), it is my only AF lens that goes out to 300mm. It appears to lose IQ once you get above 200mm, I think my Tamron AD2 60-300 SP is sharper but it's manual focus. Given that Sigma don't seem to want to support the K mount, ...
Posted by johnha on 21/04/2015 - 00:58
sigma vs Tammy 70-300 vs Pentax da 50-300
The Pentax 55-300 is a nice lens with an exceptionally useful focal length range at an absolute bargain price which I thoroughly recommend. but If you are really interested in birds in flight this is not the lens for you but really neither is anything else that is cheap either. It is possib...
Posted by gwing on 21/04/2015 - 16:11
sigma vs Tammy 70-300 vs Pentax da 50-300
I'm sure that to an extent Rob, those points would apply to all of the budget options on the table. As I've said, on the K7 I have found the Tamron 70-300 AF snappy and accurate, but I'm not a bird shooter, and I would never seriously have expected it to perform well for any fast moving action situa...
Posted by gwing on 22/04/2015 - 09:42
sigma vs Tammy 70-300 vs Pentax da 50-300
Many years ago, I tried (and then bought) the 55-300 against the non-APO Sigma (SRS in Ruislip only had that one) and there was "no contest", especially at the long end where the Pentax was very sharp (and the Sigma was heavier too). Never bought the Tamron because of the reported fringing - and ...
Posted by jeallen01 on 22/04/2015 - 10:06
testing the 16-50mm da star sdm lens
Can't tell anything on 800 pixel images :( I would recommend using the LiveView to focus when doing this kind of test. That will eliminate any possible phase focus errors ;) Matt
Posted by MattMatic on 24/04/2015 - 12:14
testing the 16-50mm da star sdm lens
Can't tell anything on 800 pixel images :( I would recommend using the LiveView to focus when doing this kind of test. That will eliminate any possible phase focus errors ;) Matt phase focus errors, what do you mean by that? An dhow does liveview help?
Posted by mattox on 24/04/2015 - 15:25
testing the 16-50mm da star sdm lens
Mattox - LiveView will perform focus using contrast detection (like a compact camera). It's slow, but it is using the sensor information directly. The "normal" phase detect focus uses a separate sensor for AF. The focus adjustment helps to correct for any alignment issues between the AF sensor an...
Posted by MattMatic on 24/04/2015 - 16:04
testing the 16-50mm da star sdm lens
just to look at i retested the 16-50 under hand held conditions with great light under live view and normal af focus. This is the comparison in good quality under dropbox as requested: 1. af focus https://www.dropbox.com/s/lfjzom952l0zhwq/k5-16-50AFlock.jpg?dl=0 2. live view https://...
Posted by mattox on 03/05/2015 - 19:42
Opteka telephoto lenses
I presume it's a long focus lens, not as short as a telephoto design. That in itself isn't a bad thing, but I've looked at these and my expectation is that they would be cheap and cheerful. Colour fringing might be the worst of it, plus very slow manual focusing.
Posted by johnriley on 25/04/2015 - 08:11
DA 12-24mm vs 16-45mm Build Quality
I found the 16-45 very plasticy and wobbly, with a ridiculous extending front element. I had issues with softness with two versions and gave up on it. Got a 12-24 and never looked back (notably, when I reversed over it :oops: )
Posted by Darkmunk on 27/04/2015 - 22:35
DA 12-24mm vs 16-45mm Build Quality
Still have my DA16-45. Found it to be a really noticeable step up from the da18-50. Found the 16mm end to be useful and the 45 end no restriction. Better image quality and the constant F4 were also useful improvements to the kit lens. It also had a useful close focus capability. Never found any pro...
Posted by doingthebobs on 27/04/2015 - 22:46
DA 12-24mm vs 16-45mm Build Quality
Still have my DA16-45. Found it to be a really noticeable step up from the da18-50. Found the 16mm end to be useful and the 45 end no restriction. Better image quality and the constant F4 were also useful improvements to the kit lens. It also had a useful close focus capability. Never found any pro...
Posted by kh1234567890 on 28/04/2015 - 20:19
Desperately in need of help
You may have read in previous posts of mine recent issues with my k5 and 16-50 lens. I have been looking at a lot of photos of mine and have noticed in comparison to others for example on 500px my photos are let's say a little soft. Nothing drastic but a little soft. Doing various tripod fixed posit...
Posted by mattox on 28/04/2015 - 14:00
Desperately in need of help
You've used quite a wide aperture, f/3.2, and focus is sharp on the dog's face. The large out of focus areas are simply outside the depth of field. As far as I can tell from this small image, the shot is sharp.
Posted by johnriley on 28/04/2015 - 15:51
Desperately in need of help
I think you need to show us, otherwise making a judgement is very difficult. Using centre-point focus, I'd like to see a shot of something flat that shows detail, at a range of apertures. I'm not sure yet whether or not you have a misalignment, or whether it's just not the best sort of image to j...
Posted by johnriley on 28/04/2015 - 16:40
Desperately in need of help
Previous post may give https://www.pentaxuser.com/forum/topic/testing-the-16-50mm-da-star-sdm-lens-53486 some idea. This is not in live view though I think you need to show us, otherwise making a judgement is very difficult. Using centre-point focus, I'd like to see a shot of something flat that sho...
Posted by mattox on 28/04/2015 - 16:45
Desperately in need of help
My experience with K5 and DA*16-50 was that they were a good pair. However, my K5 developed a serious mirror-flap-flap-flap issue and needed to be repaired (under warranty). So I sent the DA*16-50 back with it for a spruce up. Came back a different beast and sharper too! Not sure what JPS did to i...
Posted by MattMatic on 28/04/2015 - 17:21
Desperately in need of help
With regards to the first shot, I can't seem to zoom in on that photo. With a narrow in focus region (from f3.2) I'd consider looking at what is in focus. If you follow the grass/leaves back you'll see where they are sharpest and where they start to blur into out of focus. I'd suggest doing s...
Posted by richandfleur on 28/04/2015 - 22:02
