Search results for 'sensor cleaning' - page 180
Sensor Cleaning
Very interesting. Question, somewhat hypothetical: What if you bought the istDS with the 18-55 (or, preferrably, with the 16-45) and never removed the lens. Would the sensor ever need cleaning? Ted
Posted by tedwhite on 21/10/2005 - 02:59
Sensor Cleaning
Apart from missing out on the flexibility of the SLR side of things, from what I have read, you could still end up with some stuff - wear and tear bits from shutter/ mirror mechanisms (obviously much less tho'!) Andy
Posted by alfpics on 21/10/2005 - 10:21
Sensor Cleaning
The SensorSwab/ Eclipse fluid approach works really well - just takes a couple of goes to get the knack of not leaving streaks behind! Just a word of advice about using compressed air - if you are tempted. The thing you are cleaning is actually a chromatic filter mounted above the sensor, so hig...
Posted by John Newton on 28/10/2005 - 10:16
Sensor Cleaning
Speed Graphic www.speedgraphic.co.uk are stocking the new, if expensive Sensor Brush cleaning system. I have one on order, I'll let you know how it works out.
Posted by Ammonyte on 08/11/2005 - 23:26
Sensor Cleaning
Ted, Late reply to your question. When a lens zooms or focuses, it enlarges or reduces the airspace between the back element and the mirror box. This means it is either sucking air in, or pushing air out. (The system is not airtight.) This means that the lens is forever sucking dust into ...
Posted by Anonymous on 09/11/2005 - 00:11
Sensor Cleaning
Well, all quite interesting. I shall be on guard. I'd never thought about air being moved about when a lens zooms or focuses. It should follow then that the same should occur inside, for example, a Pentax Spotmatic? Perhaps this phenomenon accounts, in part, for the accumulation of schmutz on it...
Posted by Anonymous on 09/11/2005 - 02:30
Sensor Cleaning
Don't know quite how I morphed into a guest in the above post. Ted
Posted by tedwhite on 09/11/2005 - 02:33
Sensor Cleaning
I have a big old squezze bulb, the old fashioned ones that just blast a bit of air over a surface. It's all I've ever needed, hope I don't get sticky dust!
Posted by Arthur Dent on 09/11/2005 - 02:48
Sensor Cleaning
You'll always get sticky dust... the CCD is charged so in the end the dust will stick by static. Cleaning isn't that difficult though. The bulb blower gets most of the stuff away though ;) Matt
Posted by MattMatic on 09/11/2005 - 12:30
Megapixel discussion - why limited to 6 ?
Hi Group, I just read that Pentax Digital SLR's sensor has only 6 megapixels. The standard seems to be 8MP, some Pro-DSLRs have 11 MP. Some picture agencies don't accept pictures under 8 MP. I don't have DSLR yet but a lot of Pentax film SLRs and lenses so my choice would probably Pentax. My compa...
Posted by Sonnar2 on 21/10/2005 - 08:49
Megapixel discussion - why limited to 6 ?
Mega pixels aren't the whole story... Forget compact digicams. They don't compare. The sensor for compacts is miniscule, and consequently the pixel zone is minute. Noise becomes a serious problem. For example, the *ist-D at 1600ISO has less noise than some compacts at 400ISO. As regards the ag...
Posted by MattMatic on 21/10/2005 - 09:40
Megapixel discussion - why limited to 6 ?
A lot of other DSLRs are 6mp. e.g. Minolta 5D, Nikon D50, D70. OK Canon has 8mp, and professional level DSLRs have more megapixels, but I'd say the standard amongst amateur level DSLRs is still 6, though no doubt they'll all start putting 8mp sensors in to compete with Canon. Not that I think ...
Posted by Anonymous on 21/10/2005 - 11:51
Megapixel discussion - why limited to 6 ?
Are you sure sensor size counts most? Some of the newer 8MP-Digicams really challange DSLRs, much less noise than the prior generation although their small sensor. Their weak part now seems to be their lenses (far too long slow zooms which cannot be corrected so good as DSLR lenses). Some time ago ...
Posted by Sonnar2 on 21/10/2005 - 14:59
Megapixel discussion - why limited to 6 ?
I think Sophie was saying that given the current sensor size and the fact you can't do much to change the wave length of light then anything much above 6 megapixels is going to cause a trade off in another area. But don't ask me I know no more than I have read in that thread and a similar one I w...
Posted by malcolmk on 22/10/2005 - 21:36
Megapixel discussion - why limited to 6 ?
Basically, she thinks that 6Mp sensors are about as good as they are likely to get. If you cram more pixels onto the same size sensor, you'll get more noise (so 8Mp may give you worse quality, and it's not significantly bigger). If you want more quality, you'll have to go for a bigger sensor. H...
Posted by George Lazarette on 22/10/2005 - 22:06
Megapixel discussion - why limited to 6 ?
The difference between 6.1 megapixels and 8 megapixels is not enough to even think about. To double the "resolution", you'd need four times the pixels! Not long ago 4 or 5 megapixel cameras were good enough for double-page spreads in magazines, so why are the six megapixel cameras suddenly not u...
Posted by Arthur Dent on 23/10/2005 - 05:27
Megapixel discussion - why limited to 6 ?
And another thing! :-) No lens available today can out-resolve a 6Mp APS-C sensor . So more pixels won't give you sharper pictures; sharpness is limited by the lens, not the sensor. People who think they would benefit from more pixels are generally ignorant victims of cynical marketing. It'...
Posted by George Lazarette on 23/10/2005 - 12:46
Megapixel discussion - why limited to 6 ?
all completely irrellevant of course the only reason that pentax/minolta/nikon et al have a 6 mp sensor is because thats the only sensor available to them in the right format at a reasonable cost - until sony and the other sensor manufacturers have a replacement with a higher mp count they are es...
Posted by Anonymous on 06/11/2005 - 22:15
Megapixel discussion - why limited to 6 ?
Read the previous page, at the bottom of the post is this: They could squeeze 8 or 10 megapixels into a full-frame sensor (preferrably not with a 2:3 aspect raio but something more like 3:4 or 4:5) but even there you run into a limit. Hence the medium format backs. I have been carrying on for ...
Posted by Arthur Dent on 17/11/2005 - 22:33
Questions about my new *ist DS I got Yesterday
A few thoughts and points: 1. Compact digitals do their metering off the CCD itself. They are continually reading the CCD (giving the live LCD preview) and can adjust exposure based on the whole scene. DSLRs have a shutter, and have to rely on additional sensors for exposure - this is where the c...
Posted by MattMatic on 17/11/2005 - 10:18
