Search results for 'sensor cleaning' - page 279
using old k and Af lenses on a K20D
thanks for the help - I had heard that the wdie angle is reduced on digital is this correct? It is correct. The sensor on a digital SLR is smaller than the negative on your 35mm SLR. So although the lens does exactly the same as it always used to, the sensor crops the central rectangular p...
Posted by ChrisA on 05/11/2009 - 20:51
Reciprocity Failure
This is because the signal produced by the sensor in dull light is weaker, has to be amplified more and this results in increased levels of electronic noise. On film, if you keep on sending more photons of light (long exposure) more silver halide crystals will be activated and be able to be devel...
Posted by johnriley on 07/11/2009 - 00:12
Reciprocity Failure
OK but the problem with that explanation is that it implies that Exposure Time would not be relevant. Reciprocity applies over a huge range of light levels and, when it fails, it must be because each sensor needs a certain rate of photons arriving in addition to the specified number during the expos...
Posted by sophiecentaur on 07/11/2009 - 23:41
Reciprocity Failure
I seem to notice that (with my k10D) the noise in dark areas of scenes in poor light seems much worse than the equivalent in bright scenes, despite both having the 'correct' exposure (i.e. longer exposure time for lower lighting). If reciprocity applied, then this should, surely, not be the case. ...
Posted by piotro on 08/11/2009 - 00:14
Reciprocity Failure
I seem to notice that (with my k10D) the noise in dark areas of scenes in poor light seems much worse than the equivalent in bright scenes, despite both having the 'correct' exposure (i.e. longer exposure time for lower lighting). If reciprocity applied, then this should, surely, not be the case. Wh...
Posted by MattMatic on 10/11/2009 - 09:20
Reciprocity Failure
This is because the signal produced by the sensor in dull light is weaker, has to be amplified more and this results in increased levels of electronic noise. It's not necessarily amplified more. If it was you'd lose dynamic range and dark parts would be as light as light parts. In the audio world th...
Posted by Smeggypants on 12/11/2009 - 06:10
K-7 LCD screen stuck pixel
Thought about massaging the screen but like golfdiesel said it's impossible due to the hard cover over the screen. After a bit more testing of my new K-7 I have found a problem with the sensor this time:evil: There is a big wide band across the images at a higher ISO but it's also visible at l...
Posted by rmowbs on 12/11/2009 - 21:27
Viewfinders compared
Hi all A quick question for you! See, I dug out my old film Mz5 the other day and looking through the viewfinder was a very positive shock - it is huge compared to what I have becomed used to, the GX10. I want that! Why can't I get that!! You can have my SR if I can get that! So here are my qu...
Posted by Joe S on 10/11/2009 - 15:54
Viewfinders compared
- How does the K-7 compare in this respect (still haven't seen one live :?)? I know they boast 100% coverage (versus 95%) but is the actual glass larger? I think it's is about the same if my previous K20D is anything to go by (as Ken says). The 100% coverage with is what you actually see in the fra...
Posted by Greytop on 10/11/2009 - 16:25
Viewfinders compared
Before the mz5 I had a mz50 which had a smaller viewfinder - both "full frame" cameras but different size viewfinders. The focusing screen is the same size as the sensor/film size, but the magnification of the eyepiece is something that changes according to the apparent distance to the focusing s...
Posted by pentaxian450 on 10/11/2009 - 16:59
Viewfinders compared
Before the mz5 I had a mz50 which had a smaller viewfinder - both "full frame" cameras but different size viewfinders. So I am not sure the relation is quite so simple. The MZ5 has a proper pentaprism finder whereas the MZ50 had a (cheaper to make) pentamirror I believe. The pentamirrors offer a low...
Posted by hefty1 on 10/11/2009 - 18:52
Viewfinders compared
The K-7's viewfinder is about the same size as the GX10's, but the 100% coverage means the magnification is slightly less. The pentamirror finder of the inexpensive Canon camera I had a go of was brighter than that of any Pentax DSLR, but quite a lot smaller (even though the sensor is about the s...
Posted by iceblinker on 10/11/2009 - 19:50
Sensor Dust - Zeelon Anti-Static Blower
After about two years of doing all I could to stop dust reaching my K10D's sensor, it has finally happened and I have a fairly sizeable mark that refuses to be shifted by vibrating the sensor. Amateur Photographer magazine has reviewed the Zeelon anti-static blower in its latest issue. It uses filte...
Posted by daphnejohn on 11/11/2009 - 16:19
Sensor Dust - Zeelon Anti-Static Blower
Use the Pentax kit, the blowers can cause more problems than they solve. There is a video on youtube demonstrating its use. By the way, someone at Pentax has a sense of humour as the part number for the kit is O-ICK1 :) K.
Posted by womble on 11/11/2009 - 16:27
Sensor Dust - Zeelon Anti-Static Blower
There is no need for any trepidation, you aren't even going to touch the sensor itself but a piece of glass in front of it. Just make sure the battery is fully charged and follow the cleaing kit's instructions, you will be fine. The blower reviewed in AP wont be any more powerful than any other one ...
Posted by gartmore on 11/11/2009 - 16:42
Sensor Dust - Zeelon Anti-Static Blower
i have been using the pentax sensor claening system for the past 20 months and its still working fine - its a good piece of kit, easy to use and does a good job. just remember not to put much pressure on the sensor and you will be fine - the youtube video is a good one to watch
Posted by selectcase on 12/11/2009 - 12:56
Sensor Dust - Zeelon Anti-Static Blower
Many thanks for your advice, everyone. I have also watched the Youtube video which, along with your help, has given me enough confidence to tackle the job. John
Posted by daphnejohn on 12/11/2009 - 16:34
Sensor Dust - Zeelon Anti-Static Blower
I have experienced sensor cleaning in other ways. After stupidly changing lenses in dusty cambodia my sensor got literally smothered with dust and grime. I too got scarrrrreeeeeeddd. After some advice I bought a rocket blower off ebay for next to nothing. I soon discovered a little technique that si...
Posted by mattox on 12/11/2009 - 19:24
Lenses
I'm with iceblinker, the 28-80 and 80-320 will work perfectly (I still have both of mine) but taking into account the crop factor of the APS-C sensor of the DSLR these lenses will appear to have a longer focal length, the 28-80 for instance will give the same field of view as a 50-120 would on a 35m...
Posted by fatspider on 13/11/2009 - 22:51
Pentax KM - Slow...
Hiya :) If it's anything like the K20D then it shoots a sensor noise compensation shot after the actual shot at the same shutter speed. I was horrified when I bought my K20D and took a 20 minute night exposure adn thought the camera had crashed. I had to wait 20 minutes before I could use it agai...
Posted by Smeggypants on 14/11/2009 - 02:51
