Search results for 'sensor cleaning' - page 678
Why are polorising filters so expensive?
Barrie you are confusing me now :D The light hitting the film-sensor stays the same if you turn the filter, but the meter is getting confused by the filter so the meter is not metering correctly any more. The problem is that it's a TTL meter so it meters through the lens so it needs to look th...
Posted by Anvh on 31/01/2010 - 16:39
Seminars
Photomonk and I were exchanging e-mails [ nothing new there :) ] and he was telling me of a pair of Seminars in Calumet New York he will be going to soon . Have to say they sound good. Now I really enjoyed the one I went to in December - OK a lot was over my head at that time - but I've got the n...
Posted by techno-terminator on 30/01/2010 - 08:58
Long exposures, noise and cloning
I have done the experiment - with exposures with lens cap on and no noise reduction. I compared 30 sec @ ISO 200, 15 sec @ ISO 400, and 8 sec @ ISO 800 on a K-7. I allowed time for the sensor to cool between exposures. The longest exposure had the least noise. I was surprised. I was expecting ...
Posted by iceblinker on 03/02/2010 - 19:26
UV or not UV
"Petal" is indeed what that type of hood is usually known as! The shape maximises the shading without obscuring the corners of the rectangular image on the sensor. Ideally, your 50-200mm would have a petal shape hood as well, but because of the longer focal length, the hood can be long enough to ...
Posted by iceblinker on 06/02/2010 - 17:50
Heads Up on SD Cards
Are we talking download rate/transfer rate from optical sensor to storage or from card to pc?. Nic
Posted by alfiemooon on 07/02/2010 - 14:45
Heads Up on SD Cards
Are we talking download rate/transfer rate from optical sensor to storage or from card to pc?. Nic I take that back,I`ve just read the comments on the link....I presume "speed" depends on your subject. Nic
Posted by alfiemooon on 07/02/2010 - 14:46
Silly beginner Qs again
I think the main problem for beginners with new and relatively high-tech DSLR cameras with numerous buttons for this, that, and whatever is the temptation to play with all these features without first grasping the basics. Well done for taking the trouble to learn. To expose an image correctly, th...
Posted by Mannesty on 09/02/2010 - 12:19
How long is too long?? (bulb exposures on K20D)
Does anyone here know if there is a safe length of long exposure time using the bulb setting? :? Will a too long exposure damage the sensor? At this time when there are lovely clear starry skies, would like to try longer ones. I tried one at 10mins last night with no problems and used 15min...
Posted by alig on 10/02/2010 - 18:56
How long is too long?? (bulb exposures on K20D)
From what I've read, the main problem is heat and noise. It is better to take multiple shorter images then "stack" them, either in Photoshop etc, or a dedicated stacking program such as Registax. I don't think it damage the sensor as CCD chips are also used in CCTV cameras when they are on conti...
Posted by Father Ted on 10/02/2010 - 20:49
How long is too long?? (bulb exposures on K20D)
I don't think it damage the sensor as CCD chips are also used in CCTV cameras when they are on continuously. :wink: The K20D (which the OP has) uses a CMOS rather than a CCD though.
Posted by MrCynical on 10/02/2010 - 21:01
How long is too long?? (bulb exposures on K20D)
I don't think it damage the sensor as CCD chips are also used in CCTV cameras when they are on continuously. :wink: The K20D (which the OP has) uses a CMOS rather than a CCD though. Didn't know that :oops::oops:
Posted by Father Ted on 10/02/2010 - 22:39
How long is too long?? (bulb exposures on K20D)
With film cameras, the only limitation to B setting is that it takes power to hold open the shutter, so electronic shutters are limited to what the battery will do. 8 - 10 hours is usually the limit. Mechanical shutters such as on the MX you can leave open for ever if you want to. With DSLRs t...
Posted by johnriley on 11/02/2010 - 10:59
Explanation please.
A bit off your posted topic Howard, but your image is a bit noisy, and would benefit from a little cleaning up, have you tried "Neat Image" ? the software is available free but with a few restrictions unless you take the option to purchase. It works great even in the freebie mode.
Posted by fatspider on 19/02/2010 - 17:58
Explanation please.
...Great advert for the lens and your photography. It's also a great advert for a seriously underrated CCD sensor. I've no particular axe to grind here as I don't own a K10 or K200 but I'm constantly amazed by the images the sensor produces. Super study, Dan. Regards, Andrew
Posted by bwlchmawr on 19/02/2010 - 18:04
Explanation please.
This explains it quite well. http://www.pbase.com/wlhuber/100_crop_ Thanks for the link, it's made it much clearer. I've been put to shame by Dan's goldfinch. What a wonderful image, as you say iceblinker a great testament to the lens and to Dan's photography. A bit off your posted topic Howa...
Posted by HowardJ on 19/02/2010 - 20:03
Purple fringing and Elements 6
I have looked at PTLens and the colour channels can be 'zoomed' to create and destroy red/blue fringes and Y/C fringes, too but the purple fringing seems to stay there. Is it possible that the purple fringing is a sensor effect rather than being due to the lens? It only occurs when there's high ...
Posted by sophiecentaur on 23/02/2010 - 17:18
Purple fringing and Elements 6
Sophie, As I understand it, PF is a sensor issue - it is a charge 'overflow' into adjacent sensor sites. That's why you see it in lines of high contrast. Someone here may be able to explain why it is purple, as I have no answer for that. Lens design may or may not make PF worse. :)
Posted by i-Berg on 23/02/2010 - 22:35
Are Pentax likely to follow suit?
Interesting statement from Olympus. It's all got to hang on the development of EVF technology and to some extent sensors too. As far as eye can see (excuse the pun) you will always be at a disadvantage in lower light with an EVF because of the dynamic range that the sensor can display. Unless s...
Posted by Greytop on 23/02/2010 - 18:07
Are Pentax likely to follow suit?
Isn't there a problem with the image sensor and noise? I thought that having the sensor only exposed for a brief time is better for its noise performance. That would imply you would need another sensor, working all the time to feed your viewfinder and, thus, you'd still need a swinging mirror or so...
Posted by sophiecentaur on 24/02/2010 - 13:01
Are Pentax likely to follow suit?
Isn't there a problem with the image sensor and noise? I thought that having the sensor only exposed for a brief time is better for its noise performance. That would imply you would need another sensor, working all the time to feed your viewfinder and, thus, you'd still need a swinging mirror or so...
Posted by Anvh on 24/02/2010 - 13:52
