Search results for 'sensor cleaning' - page 726
A decline in DSLR sales threatens camera companies
I'd also love to see a camera with a selectable spectrum range, ie being able to set it to record a specific, user-selectable band of the spectrum, anywhere from UV to IR. why stop there? I'd love to take pictures of radio waves, microwavwes, X-rays? Gamma Rays!! of course I doubt the sensor woul...
Posted by Smeggypants on 16/10/2013 - 02:54
A decline in DSLR sales threatens camera companies
The sensor can detect frequencies from about 350nm to 1100nm; filters in a standard camera reduce this to a range from about 400nm to 700nm (the same as the human eye). My IR camera is converted to record frequencies from 665nm to 1100nm. My next one will be full-spectrum, ie it will record everythi...
Posted by aliengrove on 16/10/2013 - 14:51
A decline in DSLR sales threatens camera companies
The sensor can detect frequencies from about 350nm to 1100nm; filters in a standard camera reduce this to a range from about 400nm to 700nm (the same as the human eye). At the risk of being called a pedant, you have referred to 'wavelengths' which are related to the frequencies by the relationship: ...
Posted by pgweber on 16/10/2013 - 15:06
A decline in DSLR sales threatens camera companies
There is a serious discussion to be had around the optical viewfinder. That single 'option' requires significant hardware and space. Take that away, as you do when you use liveview, and you've got the same lens and sensor, just without the volume the optical viewfinder consumes. I'm a fan of th...
Posted by dcweather on 16/10/2013 - 20:02
New developments.
Just been looking at the new Sigma 24-105 HSM, looks good on specs so far. Our sensor benefactor has just announced two FF mirror less interchangeable lens cameras. 24Mpx and 36Mpx resp. If Ricoh do launch a FF I am guessing that it may use one of those sensors. The end of 2013 is getting to ...
Posted by K10D on 14/10/2013 - 23:55
New developments.
I don't buy the clam that a FF Pentax camera has to be any or much bigger than a K-5/K-3 I've got several Pentax FF film cameras that while thinner, are not really any bigger width and height than the K-5. Yes I know sensors, LCD screens, etc are thicker than film and that accounts for the bod...
Posted by Smeggypants on 15/10/2013 - 07:59
New developments.
I don't buy the clam that a FF Pentax camera has to be any or much bigger than a K-5/K-3 I've got several Pentax FF film cameras that while thinner, are not really any bigger width and height than the K-5. Yes I know sensors, LCD screens, etc are thicker than film and that accounts for the bod...
Posted by Mongoose on 15/10/2013 - 13:31
New developments.
I don't buy the clam that a FF Pentax camera has to be any or much bigger than a K-5/K-3 Nor me. The required thickness of the body is going to be ultimately determined by the lens registration distance plus sensor unit thickness. Now the lens registration distance is already set for FF rather th...
Posted by gwing on 15/10/2013 - 13:53
New developments.
A bigger sensor unit might also mean a slightly more powerful SR mechanism. Not insurmountable I guess.
Posted by johnriley on 15/10/2013 - 14:06
New developments.
A bigger sensor unit might also mean a slightly more powerful SR mechanism. Not insurmountable I guess. Well yup there's more mass to vibrate, but I think a more powerful set of coils could be designed without makign them bigger. The expense would be more current from the battery
Posted by Smeggypants on 15/10/2013 - 20:27
Dealing With Chromatic Aberrations
I have found that both DA and non-DA lenses do have some CA in certain circumstances. Then again, many of my lenses will or won't show CA depending on Aperture or indeed the body it is on. For example my 16-45 hates my K-5, but is fine on the K20D. My SMC-M 50mm F1.7 hates my K10D but loves my K-5. ...
Posted by Offertonhatter on 18/10/2013 - 20:56
Why do we stay with Pentax?
So, its possible that what some of those who jumped ship really needed was in fact a bigger looking camera that their clients (who don't understand the technical differences between sensor sizes, photosites and megapixels) would easily identify at a glance as a proper professional grade model, which...
Posted by McGregNi on 28/10/2013 - 20:54
Why do we stay with Pentax?
So, its possible that what some of those who jumped ship really needed was in fact a bigger looking camera that their clients (who don't understand the technical differences between sensor sizes, photosites and megapixels) would easily identify at a glance as a proper professional grade model, which...
Posted by Pentaxophile on 29/10/2013 - 09:20
According to Ricoh Imaging France
EDIT: Crossed in the ether while attending to pressing matters :roll: 1/180s is the fastest shutter speed where both leading and trailing curtains are open - giving a full view of the sensor. Anything faster requires that the trailing curtain start travelling before the leading curtain has fin...
Posted by MattMatic on 06/11/2013 - 16:51
According to Ricoh Imaging France
I'm not sure why Pentax have decided to limit sync at 1/180 rather than 1/250; either it's something to do with the shutter system or their engineers are just bloody minded/over cautious. It's likely that the shutter is sourced from a specialised manufacturer, thus it will be designed around a parti...
Posted by johnha on 06/11/2013 - 21:30
According to Ricoh Imaging France
No - because the shutter blade is still travelling at the same speed; it is simply a matter that the trailing blade sets off before the leading blade has completely finished exposing the sensor/ film which means you have a slot, or a strip of light exposing the sensor/ film rather than the sensor be...
Posted by alfpics on 07/11/2013 - 09:34
According to Ricoh Imaging France
The speed of a focal plane shutter remains the same once the point is reached where the shutter speed is controlled by the width of the slit that crosses the sensor plane. I was anticipating that a faster running shutter might not last as long, but then the difference of 1/3 stop isn't going to b...
Posted by johnriley on 07/11/2013 - 09:37
According to Ricoh Imaging France
The speed of a focal plane shutter remains the same once the point is reached where the shutter speed is controlled by the width of the slit that crosses the sensor plane. I was anticipating that a faster running shutter might not last as long, but then the difference of 1/3 stop isn't going to b...
Posted by Don on 07/11/2013 - 11:13
According to Ricoh Imaging France
Back in the ME/MX days flash sync was only 1/100th sec so at least we've nearly doubled it! And the istD range were 1/150 I think. It's creeping up. I'd guess that if Pentax thought it was a real priority, they'd have commissioned a better shutter. But given that fast accurate AF hasn't bee...
Posted by ChrisA on 07/11/2013 - 13:37
According to Ricoh Imaging France
X=1/200 s; synchronizes with shutter at 1/250 s or slower (flash range drops at speeds between 1/200 and 1/250 s) I don't know how that works - I'd have thought the sensor is either fully open or it's not, but there's obviously something else going on.[/quote] Looks like there's some sort of HSS ...
Posted by johnha on 07/11/2013 - 17:16
