Search results for 'uv filter' - page 201
So how good is the K-5 sensor
Aplogies if this has been linked before. It's all good stuff. Never saw this amount of activity in a LONG time. One comment on another thread said that the K5 & D7000 are distant cousins. I say the companies are watching each other with great respect. My overall impression? The cameras...
Posted by Greytop on 16/11/2010 - 14:08
So how good is the K-5 sensor
Aplogies if this has been linked before. It's all good stuff. Never saw this amount of activity in a LONG time. One comment on another thread said that the K5 & D7000 are distant cousins. I say the companies are watching each other with great respect. My overall impression? The cameras...
Posted by K10D on 16/11/2010 - 23:23
K5 ISO worth the upgrade form K7? Compare and decide.
This is the kind of side by side test people have been waiting to see. Confirms the K-5 sensor is 'superior', but that the K-7 isn't quite ready for the bin yet! The softness on the K-5 samples may be a stronger AA filter at work. BUT I am sure the softness would not really translate into prints ...
Posted by Pentaxophile on 11/11/2010 - 12:59
K5 ISO worth the upgrade form K7? Compare and decide.
I also wondered about the AA filter, but I've heard (read, actually) speculation that the AA filter is weaker on the K5 than previous models.
Posted by thoughton on 11/11/2010 - 13:00
K5 ISO worth the upgrade form K7? Compare and decide.
The softness on the K-5 samples may be a stronger AA filter at work. BUT I am sure the softness would not really translate into prints that have been post processed. Just like the noise on the K-7 would not, up to ISO800 if not beyond in some cases. Maybe it's better to fully process two or three IS...
Posted by Anvh on 11/11/2010 - 16:23
K-5, my first experience
Be careful with a diffuser as it zaps a lot of the flash power. I wouldnt set a load of settings in and save them for next time as if conditions change then so will your settings and if you forget to amend them you'll have a load of images that are not right and you'll be back to square 1 again! I s...
Posted by SmutjeUK on 05/12/2010 - 10:24
K5 owners
There have been isolated reports of K5 owners in Hong Kong and Singapore, and now in the US, discovering black spots on their sensor, apparently between the AA filter and sensor so it cannot be cleaned off with a sensor cleaning kit. More info here: http://www.pentaxforums.com/forums/pentax-k-5-for...
Posted by thoughton on 05/12/2010 - 10:46
K5 owners
John - I cleaned my sensor after the first attempt showed spots. The spots were in exactly the same place after cleaning. I tried different lenses too. I'm sure others have done the same. Yes, but the dirt (if it is dirt) could be between the Bayer filter (which is what you cleaned) and the sensor....
Posted by George Lazarette on 05/12/2010 - 20:22
K5 owners
John - I cleaned my sensor after the first attempt showed spots. The spots were in exactly the same place after cleaning. I tried different lenses too. I'm sure others have done the same. Yes, but the dirt (if it is dirt) could be between the Bayer filter (which is what you cleaned) and the sensor....
Posted by Gwyn on 05/12/2010 - 20:29
K5 owners
not everyone rushes to shoot f22 shots of a blank wall in their first week of ownership! And to think I was using my K10D for a good 18 months with a ruddy great scratch on the sensor/filter and hardly gave it a thought.
Posted by Mike-P on 05/12/2010 - 21:30
K5 owners
I have to say I am a little surprised at those on this thread who are minimising this issue. To clarify - are we saying this dust is between the filter and sensor? If that were the case and I had bought one, I would be less than pleased. I hope Pentax have not shot themselves in the foot he...
Posted by Oggy on 06/12/2010 - 13:00
K5 owners
If it is dust trapped between the sensor and the filter, although disappointing, for me it’s not too much of a disaster. (My K-5 is also affected) My main worry is if it is some form of surface contamination then it could get worse over time. We will have to see what Pentax have to say about this.
Posted by Dave_Evanson on 06/12/2010 - 13:11
K5 owners
There are also few photographers who spend much time shooting white paper at f22....I can't remember the last time I did that. :) I know what you're getting at John, my own marks would be difficult to see on anything other than white paper, or a clear blue sky. However ... some people have large...
Posted by thoughton on 06/12/2010 - 13:29
K5 owners
A user on DPR has posted actual photos of the marks on the sensor itself confirming that it is on the underside of the AA filter (he used a Raynox 250, and presumably a micro focus rail): http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=37101106&page=3 (3rd post down).
Posted by thoughton on 06/12/2010 - 14:18
K5 Poll
has anybody tried cleaning it off with alcohol? This has been thoroughly explained over at PF. There is photographic evidence, as well as a mathematical proof, that the marks are NOT on the surface of the AA filter. They are sandwiched between the AA filter and the sensor.
Posted by thoughton on 08/12/2010 - 16:06
K5 Poll
I think there are two different issues here one is easily fixable. One issue is blotches or stains UNDER the aa filter the other may be lubricant flinging off the mirror hinges onto the aa filter. whatever they lube the moving parts with has to be very light and susceptable to flinging off, a heav...
Posted by Don on 08/12/2010 - 16:10
K5 Poll
From posts on the other forum the consensus is that the spots are on the underside of the AA filter or the top surface of the sensor (favourite appears to be the underside AA filter). Either way its unlikely that its being deposited on the sensor by the shutter, mirror or even the SR mechanism. ...
Posted by Dave_Evanson on 08/12/2010 - 16:13
K5 Poll
is the photo I'm talking about, which clearly no one else has seen :D :D :D DCUK's caption for the image was "Please note the fine white marks are the problem area, the bubble effect seen below the marks, is out of focus reflections from the light." that would IMHO mean the white spots are on top...
Posted by Don on 08/12/2010 - 16:30
K5 Poll
Don, there is apparently a 0.44mm gap between the AA filter and the sensor. You need to read :) As well as showing an image of the gap, it also explains how a microscopic particle can leave a ring-shaped shadow (short answer: diffraction)
Posted by thoughton on 08/12/2010 - 16:32
K5 Poll
I think there are two different issues here one is easily fixable. One issue is blotches or stains UNDER the aa filter the other may be lubricant flinging off the mirror hinges onto the aa filter. whatever they lube the moving parts with has to be very light and susceptable to flinging off, a heav...
Posted by Oggy on 08/12/2010 - 21:55
