Search results for 'sensor cleaning' - page 18
pentax *ist D
I'd look at picking up a second hand DS which doesn't need modding rather than risk damaging the D As far as I know the sensor and filter would be the same on the Ds as it is on the D. IR sensitivity is okay on both, but with the filter removed I'm guessing shutter speeds would be much less - handh...
Posted by Daniel Bridge on 21/12/2007 - 14:15
pentax *ist D
I'd look at picking up a second hand DS which doesn't need modding rather than risk damaging the D As far as I know the sensor and filter would be the same on the Ds as it is on the D. IR sensitivity is okay on both, but with the filter removed I'm guessing shutter speeds would be much less - handh...
Posted by LiamD on 21/12/2007 - 20:31
DoF and 1.5x: Correct me if I'm wrong ...
It's not quite as simple as you've made out ;) You need to read up on "The Circle of Confusion" - which is, alas, a little vague and subjective. There's a very nice online DoF calculator (make sure you enter the actual focal length, not your 1.5x - because the focal length never actuall...
Posted by MattMatic on 09/01/2008 - 21:04
DoF and 1.5x: Correct me if I'm wrong ...
It always amazes me how often this issue pop's up at various forums. As a general rule of thumbs you can say: With the use of a fixed focal lenght and a fixed aperture DOF will increase as film( or sensor) size decreases. One example: Ever wondered why small digital compact never have an aperture...
Posted by Malo1961 on 10/01/2008 - 07:08
DoF and 1.5x: Correct me if I'm wrong ...
That's close, but don't forget that a , say, 50mm lens is always a 50mm lens regardless of what size sensor you put behind it. And at a given distance will always have the same DOF. What changes is the sensor size, so on a small format it will be a telephoto with the same DOF that it will be on ...
Posted by johnriley on 10/01/2008 - 07:57
DoF and 1.5x: Correct me if I'm wrong ...
I ran the calcs with the two different circles of confusion for 35mm and APS-C digital sensor, and the ratio of the depths of field came out as the square of the crop factor. So basically the digital camera with the 77mm focal length would have about 1.52² times the depth of field a 35mm film camera...
Posted by kcmadr on 10/01/2008 - 15:36
DoF and 1.5x: Correct me if I'm wrong ...
I ran the calcs with the two different circles of confusion for 35mm and APS-C digital sensor, and the ratio of the depths of field came out as the square of the crop factor. So basically the digital camera with the 77mm focal length would have about 1.52² times the depth of field a 35mm film camera...
Posted by ChrisA on 10/01/2008 - 15:54
lens cleaning
Have anyone tried single use cleaning wipes intended for spectacles on camera lenses? and if so did you have any problems. I recently bought some for my glasses and was amazed at how simple it was to get my glasses clean and smear free with the minimum amount of effort. I have never been very ...
Posted by fatspider on 19/01/2008 - 14:31
lens cleaning
When I first took up photography in the early 80's, Lens tissues were the thing I used. I can't remember what the paper was impregnated with, but they always worked well. (Use once and throw away). Later I purchased some Pentax microfibre cleaning clothes, which are excellent, the downside is th...
Posted by stevejcoe on 19/01/2008 - 14:43
lens cleaning
The first rule of cleaning lenses is don't. At least, unless absolutely necessary. Personally I would not use spectacle cleaning wipes because they are impregnated and may have an adverse effect on the lens coatings. I use the Pentax microfibre cleaning cloth and this seems to be totally satis...
Posted by johnriley on 19/01/2008 - 15:34
lens cleaning
Personally I have often used the Kodak lens cleaning paper (lint-free) and the Kodak lens cleaner fluid, with excellent results. (Good for spectacles as well). I do agree that lenses are best left alone when it comes to cleaning, but sometimes it is unavoidable!
Posted by terje-l on 19/01/2008 - 17:02
lens cleaning
For cleaning my lenses I use a Lenspen, it has a retractable soft brush at one end for removing dust and debris and a small chamois pad impregnated with carbon which is great for removing smudges and greasy fingermarks: http://www.lenspen.com/?cPath=1&products_id=LP-1&tpid=146
Posted by browngo1 on 22/01/2008 - 10:02
lens cleaning
least agressive first: blow on it. if that fails: rocket blower. if that fails: brush from lenspen. if that fails: chamois side of lens pen. if that fails: microfiber cloth and lens cleaning solution. if you need to get agressive, spend some time reflecting on what you might do different...
Posted by Don on 22/01/2008 - 12:25
lens cleaning
what about Are good? are they to be used dry?
Posted by max11 on 25/05/2009 - 22:24
lens cleaning
Lens tissue are rubbish compared to a microfibre cloth. Even better is a LensPen: http://www.lenspen.com/ These mop up grease with dry carbon powder on a soft felt tip. Brush beforehand to remove loose dust/grit. Brush again afterwards to remove excess carbon powder.
Posted by iceblinker on 25/05/2009 - 22:33
lens cleaning
Those are with chemicals I believe. Most of the time that's really not needed and you can harm the coating with that. A clean moist dishwash cloth works fine to remove smears (I don't know if it's a good idea to use a tiny bid of dish was soap?) but all the other times I've a special dry lens cl...
Posted by Anvh on 25/05/2009 - 22:38
lens cleaning
I've tried using single use spectacle tissues, but without success. Maybe because they were cheap ones, but they smeared like hell. Had to pinch one of my daughter's ( funnily enough, Pentax) cleaning cloths that she got with her spectacles.
Posted by Father Ted on 25/05/2009 - 23:14
lens cleaning
We get those dry cloths made of very fine cotton(? I believe) with your spectacles, they work fine to clean your lens.
Posted by Anvh on 25/05/2009 - 23:30
lens cleaning
I use a couple of lens pens which work great but try to steer clear of lens cleaning as much as possible
Posted by sanderscapes on 26/05/2009 - 00:33
lens cleaning
I used to use Pentax Micofibre Cloths, but the JML Micofibre Cloths are much better. Brilliant when wet for cleaning vinyl inside cars etc. Lens tissues should be used with cleaning solution if the lens is dirty, if only slight, breath on the lens and then use the tissue. shim
Posted by shim on 26/05/2009 - 07:31
