Search results for 'sensor cleaning' - page 115
31mm F1.8 Limited Edition
Each item is made with a deviation from a standard; and will be considered to be inspec if the deviation is within stated limits - the manufacturing tolerence. So we can have a deviation from standards in the distance from camera lens mounting to sensor and the distance behind the lens' flange fo...
Posted by Bob and his Pentax on 02/02/2010 - 13:57
Samyang/Falcon/Rokinon/Vivitar/Bower 85mm f1.4
Mike - I was wondering when I was going to see some pictures by this lens, not of the lens! As the previous owner, I'd back up what Mike says: decent build quality apart from the hood and cap (and I even included a centre pinch cap in the deal too....). Image quality is actually very good inde...
Posted by JonSchick on 05/02/2010 - 22:15
A really good MACRO lens
So, care to explain the concept of reversing a lens please? Have been looking at some Macro lenses and realise i wont get much change from £600-700 for a Macro at 200mm. Those above have explained how to do this very well, if you're after why you do it, consider this: In a handheld camera with a...
Posted by Mongoose on 08/02/2010 - 14:40
FA 28mm f2.8 - any thoughts?
I'm pretty impressed with mine, it seems to be a very good performer when stopped down a tad from wide open. I posted some images from mine in thread. I think it's a great walk around focal length for a prime on a crop sensor.
Posted by Greytop on 13/02/2010 - 00:33
Slow AF?
I have yet to be genuinely let down by Pentax AF. I have on a few occasions but I put that down to the K10D whith its scratched sensor, 40,000 + shutter actuations and designer red tape memory card door lock. (oh and me).
Posted by Mike-P on 14/02/2010 - 10:43
Slow AF?
K10D I'm glad you didn't took my comment as an offence, was just applying that the matter is not as simple as just a faster AF there is much more to it :? You can't really lay your finger on the matter why the SDM is quite slow where for example the Sigma version is faster. For me the AF speed i...
Posted by Anvh on 17/02/2010 - 21:20
Confused again!
ok so both images should be the same ?, i was under the impression that the 28-300 should have some of the image slightly cropped No, there's no cropping because the image circle is more than large enough to cover the digital sensor. It's the other way round. A digital lens can cause cropping (vi...
Posted by iceblinker on 15/02/2010 - 23:22
Confused again!
Reading between the lines I think organicimagery's use of the term 'cropping' is incorrect, but I think he's getting this from the frequently used term the 'crop factor'. (For organicimagery's benefit): But this of course matters when you have a point of reference from a 35mm body. If you are onl...
Posted by Snootchies on 15/02/2010 - 23:43
Confused again!
Ok so 28mm is wide on a full frame/35mm camera, however when on a dslr it applies a 1.5 field of view, to compensate for the smaller sensor,from old thread from hefty: Focal length is focal length and a 300mm lens on film is still a 300mm lens on digital. The difference is that your digital se...
Posted by organicimagery on 16/02/2010 - 02:52
Sigma 18-50mm EX F2.8
I was thinking about this lens and the Sigma 17-70. There is a Sigma 17-50 f2.8, but all the sources I found say that the Tamron is better. My decision as based on: 17-50 is too close to the 18-55 range from my mkII kit lens I already have the f1.4 FA 50mm lens, so do i need the speed at the 5...
Posted by Stu-D on 17/02/2010 - 13:43
New Sigma 85mm f1.4
I hope they continue to develop fast primes. A 105mm f1.8 or 135mm f2 would be a welcome addition. In FF perhaps those lengths are good but the 85 is good for crop sensor and I might be tempted but as always the payoff is the size. The Pentax 70 is so sweet and at f2.4 not too slow.
Posted by mikew on 21/02/2010 - 15:53
DA* 50-135mm - problems with autofocus
Never heard that's a common problem with this lens, it does had some SDM problems where the SDM did not work. If it catch focus or not has also to do with your camera and what you're focusing on. The AF sensor needs to have contrast to judge if it's in focus or not. Without having the camera an...
Posted by Anvh on 21/02/2010 - 16:49
DA* 50-135mm - problems with autofocus
Try cleaning the contacts. On your MZ-S it will be using the screw drive. I have found that a quick rub with a clean tissue often works wonders. Johnson's Photopia did a good job on fixing my 50-135 (self inflicted problem) but aren't all that quick, and aren't very communicative unless prodded...
Posted by womble on 22/02/2010 - 19:00
will the lens fit.
Just to explain the above: the difference in field of view is due to the difference between the size of the digital sensor compared to a frame of 35mm film. It's 1.5 times smaller.
Posted by iceblinker on 22/02/2010 - 12:56
will the lens fit.
I still think dropping the K-m was a huge mistake by Pentax, as they've yet to offer a genuine replacement. The K-x is a lot more expensive. Most likely they had to drop it since the Sony sensor they used was already 4 years old and most liekely outdated and no longer in production.
Posted by Anvh on 22/02/2010 - 15:28
will the lens fit.
I still think dropping the K-m was a huge mistake by Pentax, as they've yet to offer a genuine replacement. The K-x is a lot more expensive. Most likely they had to drop it since the Sony sensor they used was already 4 years old and most liekely outdated and no longer in production. The sensor no lo...
Posted by robbie_d on 22/02/2010 - 16:29
will the lens fit.
[quote:3496ace15f="Dangermouse"]I still think dropping the K-m was a huge mistake by Pentax, as they've yet to offer a genuine replacement. The K-x is a lot more expensive. Most likely they had to drop it since the Sony sensor they used was already 4 years old and most liekely outdated and no longer...
Posted by Anvh on 22/02/2010 - 17:29
will the lens fit.
We have gone a bit off topic here! :) My recommendation would be to buy a second hand K10D. If you are used to using your MZ6 in Av/Tv etc. modes and won't miss all the "Paction" type modes, the K10D has the advantage of dual control wheels which is an excellent feature, of not being too long in...
Posted by womble on 22/02/2010 - 18:55
will the lens fit.
thanks guys was getting lost with all that sensor stuff. There is a km on ebay with a 18-55mm lenses for £398, it is 8mths old. Does this represent value: for money.:?
Posted by cono on 23/02/2010 - 09:41
will the lens fit.
thanks guys was getting lost with all that sensor stuff. There is a km on ebay with a 18-55mm lenses for £368, it is 8mths old. Does this represent value: for money.:? It's a good camera. It does have a mirror viewfinder instead of a prism one and it has less manual controls so you will rely on the...
Posted by Anvh on 23/02/2010 - 09:50
