Search results for 'back focus' - page 1175
FA 28-105mm F3.2-4.5
In the 'Scotsman' shot, I thought there seemed to be some softness in the detail of the ballast and foliage and also the number-plate didn't jump out. However, I accept the point about focal length and conversely I am impressed by the noise performance. It must have been fading evening light to have...
Posted by McBrian on 17/05/2016 - 18:33
FA 28-105mm F3.2-4.5
In the 'Scotsman' shot, I thought there seemed to be some softness in the detail of the ballast and foliage and also the number-plate didn't jump out. However, I accept the point about focal length and conversely I am impressed by the noise performance. It must have been fading evening light to have...
Posted by StephenHampshire on 17/05/2016 - 18:56
Focus breathing
If you watch Tony Northrup's you tube channel you will know he often mentions the issue of focus breathing, particularly with 70-200 lenses at closer distances. Having just bought a DA 200mm prime I thought I would compare it with the Sigma 70-200 at 200mm. Both shots at f2.8 from the same shooti...
Posted by smudge on 17/05/2016 - 17:27
Focus breathing
I'm not completely sure what you're getting at but some zooms seem to appear as if they have shorter focal length at closer focussing distances than they do at infinity. Notably the Pentax 18-250 gets close to 200mm at close distances! Is this what you mean? The DA 200mm should be pretty accur...
Posted by JAK on 17/05/2016 - 18:19
Focus breathing
Mmm looking at the photos it looks like either the sigma is around 205 and the pentax at 200 or pentax at around 195 mm and sigma at 200mm. I wouldn't know how you'd go about testing it though.
Posted by derek897 on 17/05/2016 - 18:40
Focus breathing
The Pentax will be 200mm (or should be as it's a prime). The Sigma is noticeably shorter than 200mm at close focus, though it will be a true 200mm at infinity.
Posted by smudge on 17/05/2016 - 19:07
Focus breathing
All IF lenses focus by changing the focal length. The DA 200mm is probably about 167mm at it's closest focus distance of 1200mm. Should be around 200mm at infinity, but they are rarely that exact. The Sigma looks a lot smaller about 83% of the size of the 200mm so it could be about 140mm at 12...
Posted by Algernon on 17/05/2016 - 19:14
Focus breathing
Mmm looking at the photos it looks like either the sigma is around 205 and the pentax at 200 or pentax at around 195 mm and sigma at 200mm. I wouldn't know how you'd go about testing it though. Other way around :oops::oops::oops:
Posted by derek897 on 17/05/2016 - 19:37
Focus breathing
All IF lenses focus by changing the focal length. The DA 200mm is probably about 167mm at it's closest focus distance of 1200mm. Should be around 200mm at infinity, but they are rarely that exact. The Sigma looks a lot smaller about 83% of the size of the 200mm so it could be about 140mm at 12...
Posted by womble on 17/05/2016 - 20:12
Focus breathing
It's odd how these terms spring up, a bit like bokeh. We lived without them for decades and then suddenly they're in everyday use. The amazing power of the internet I guess.
Posted by johnriley on 17/05/2016 - 22:12
Focus breathing
Focus breathing is an issue in video terms, where the 'width' of the shot changes as the camera focusses on items near and far in the scene. In photography terms, where you're talking one still frame in isolation to others, it's not so much of an issue.
Posted by richandfleur on 17/05/2016 - 22:41
SMC M lenses
Newer models may have better colour or contrast and autofocus but they are less enjoyable to use. For landscape or night photos old lenses are often better because they don't focus beyond infinity. I have plenty of AF lenses but I love using my M and K and other old manual lenses too, on both fi...
Posted by Jonathan-Mac on 20/05/2016 - 21:36
SMC M lenses
.... Does the old lenses give as much in terms of sharpness, Col and over all IQ quality as the more modern day lenses........ I have been happy with the IQ of the old lenses. But wonder if there might be any benefit in upgrading to the newer models..... Many of the older lenses are on a par with cu...
Posted by LennyBloke on 20/05/2016 - 22:28
SMC M lenses
.... Does the old lenses give as much in terms of sharpness, Col and over all IQ quality as the more modern day lenses........ I have been happy with the IQ of the old lenses. But wonder if there might be any benefit in upgrading to the newer models..... Many of the older lenses are on a par with cu...
Posted by philstaff on 20/05/2016 - 22:53
SMC M lenses
I love the quality that the 'old' lenses give me, and the fun. I broke my 50mm 1.7 'M' last week, which I adored but found a 1.7 'A' on the bay which cost me £35.00 incl postage. Once it was set up I would be pushed to say my £250 plus 2.8 35mm Ltd is giving better results. I fear not. I have to say...
Posted by frob on 21/05/2016 - 06:47
SMC M lenses
Yes, it was all so wonderful it's hard to understand why any company bothered to design any new lenses after 1979 :shock: ...(deliberate sarcasm. :) ). This could have been a good opportunity to compare pros and cons of old and new, not just another gushing session for ancient lenses. We all know a...
Posted by McGregNi on 21/05/2016 - 08:00
SMC M lenses
Just to elaborate on my perspective with this. .... Not looking further than a particular era and lens type can be photographically limiting, not just IQ wise but subject matter as well, and environments available to you .... Think ultra wide angle for dramatic architectural /urban images ..... Low...
Posted by McGregNi on 21/05/2016 - 12:44
SMC M lenses
Well I hardly use my manual focus lenses (except for macro) because I find manual focus more difficult with DSLRs than it was with film cameras. A slightly out of focus image will not be as good as an in focus image. Older lenses are usually more prone to purple fringing. That said they do feel very...
Posted by smudge on 21/05/2016 - 12:52
SMC M lenses
Yes and that convenience can work the other way as well ....a good recent example, kids birthday party in a dim room with a mix of natural light and tungsten. Even at ISO 1600 (the most I'm happy to go to on the K7) I still needed a wide aperture to get acceptable shutter 'speeds' of around 1/30ths...
Posted by McGregNi on 03/06/2016 - 08:46
SMC M lenses
I got the exposures well, although missed focus sometimes. An AF wide zoom with F2.8 might have been better overall (although the A28mm is sharp and the colours look great) Just a thought, but do you use catch-in focus? I have rediscovered it recently and it seems to work outstandingly well for l...
Posted by andrewk on 03/06/2016 - 09:57
