Search results for 'sensor cleaning' - page 129
12-24mm & purple fringing with K-5
The PF problem is, I believe, sensor based. What is interesting is that some lenses seem to induce it and others don't. Anyone know why? Also, can anyone answer my original question which was - does the 12-24 induce it? I loved my K20, bought a K-7, had severe focus issues, was (I think) badly se...
Posted by beardedwombat on 10/02/2011 - 22:55
Sigma 105mm Macro?
What is meant by 1:1 and 1:2? Hear the phrase but no idea what it means. They are expressions used to describe the size of your subject on the camera's sensor. For example; if you take a photo of an insect that is 10mm in length and the image of it takes up 10mm of the sensor (or film) then it is...
Posted by hefty1 on 21/02/2011 - 23:43
Fungal Growth
The ease of cleaning/destroying fungus is entirely governed by :- 1: How deep into the lens assembly the fungus actually is, and 2: How easy/difficult the lens is to dismantle. If the fungus is on the inside of the front or rear element and the affected element is simple enough to remove, th...
Posted by Mannesty on 17/02/2011 - 17:03
Fungal Growth
Interesting. Maybe I just get the lens to 'play' around with it and if it does goes wrong at least I know that I should better leave my hands away from it. I may just have a go if I get it cheap enough. I have had fungus professionally removed from a Pentax-A 200mm f4, cost around £40. I will atte...
Posted by Dangermouse on 17/02/2011 - 17:09
Fungal Growth
If you can go back away in the forum you should find that mowag not only cleansed a lens for me but put on the forum pictures showing the proceedure This should give you a very clear idea of how to go about cleaning fungus. I miss Mowag. He was so helpful.
Posted by thoramay on 17/02/2011 - 17:29
Fungal Growth
I can see how UV light would kill fungus, but I can't see how it would make it disappear? The fungus itself would surely be left as a dead husk? The fungus is microscopic so in order to see any dead husks you'd need extremely acute eyesight! The "spiders web" that is visible to the naked eye isn'...
Posted by hefty1 on 18/02/2011 - 11:30
Backfocussing 35 mm macro limited
It just sounds as though the infinity focus setting is out - Pentax's repair bods should be able to fix that in an hour assuming it's anything like the FA 80-200mm I had to reset infinity on after cleaning fungus. I would be more inclined to ask for a replacement and check it thoroughly before ta...
Posted by Dangermouse on 21/02/2011 - 09:43
Bellows advice please
1:1 is 1:1 regardless of the sensor/film size it is projected onto. It will appear to be bigger on digital as you have the same size image taking up proportionately more of the capture area available.
Posted by hefty1 on 23/02/2011 - 23:45
TAMRON SP 90MM F2.5 MACRO LENS.
I agree that the Tamron 90 2.5mm is an excellent lens, and something of a bargain. I used it a lot with my old Nikon camera and was very pleased with the results. I have bought a PK mount so as to use the lens with my K-5. As I understand it (I can't test it because my K-5 is away having its sensor ...
Posted by Dotandcom on 23/02/2011 - 23:08
TAMRON SP 90MM F2.5 MACRO LENS.
I splashed out on a new SP 90mm f/2.5 sometime in the 1990s, after inheriting a bit of cash! Complete with 1:1 extension, hood and Adaptall-2 mount for my M42 Pentax Spotmatic. Very good macro lens. Later I started using an Olympus OM2 spot meter 35mm camera, and bought the Adaptall mount for that. ...
Posted by OldTaffy on 05/03/2011 - 18:48
TAMRON SP 90MM F2.5 MACRO LENS.
.... One thing that I have noticed, with this pre-digital era lens, is slight flare when photographing a black or very dark subject. It shows as a disk of faint pale blue haze centre-frame. It seems worse with small f-stops and long tripod exposures - and covering the viewfinder window does not h...
Posted by Transit on 05/03/2011 - 21:11
TAMRON SP 90MM F2.5 MACRO LENS.
Grey overcast day here in East Anglia, so I put the K-x on a tripod to test the Tamron SP 90mm f2.5 with some home-made cards. All-manual: focus, f-stop and exposure. AWB set, and 2-sec delay for tripod work. There is no detectable flare in the images taken at the wider apertures: f/2.5, f/5.6 ar...
Posted by OldTaffy on 06/03/2011 - 15:34
TAMRON SP 90MM F2.5 MACRO LENS.
Using my PKA adaptor on the Tamron 90mm f2.5. It shows a max available aperture on my K-x of f4.0. Your PK/A mount may not be working properly - some of them appear to suffer from an issue where threadlock has seeped through from a screw near the electrical contacts on the mount face. This threadloc...
Posted by sorted78 on 07/04/2011 - 13:47
What lenses to keep and what to get rid of and what new lens should I buy?
[quote:3496ace15f="Pentaxophile"]I wouldn't cry... the 35 2.4 is a very nice lens, less than a stop slower than the 31mm (not that I am saying it is on a par with that particular lens!) my entry for the "Noir" comp was with the 35 2.4...:wink: Really good pic[/quote] thanx... I could've spent a lit...
Posted by Don on 09/03/2011 - 18:19
Sensor resolution, lens resolution and image quality
I have just been reading Frogfish's excellent thread as I am thinking of making the same change. Whilst I was pondering this I wondered about other factors than the lens in getting the best image quality. Everything comes with a price, usually for a reason. Then there are rate limiting steps and dim...
Posted by dcweather on 28/02/2011 - 23:56
Sensor resolution, lens resolution and image quality
Looking at your lens list there are not many new DA lenses there. I think new lenses are generally better for digital cameras. Your K-x should not limit your photography, it's capable of very fine results. I would concentrate on the lenses.
Posted by johnriley on 01/03/2011 - 00:09
Sensor resolution, lens resolution and image quality
Invest in quality glass, it makes all the difference...
Posted by cabstar on 01/03/2011 - 01:12
Sensor resolution, lens resolution and image quality
I second the lenses argument. The K-x pretty much stands it's ground. You'll have more room to work with when you opt for the lens.
Posted by Opethian on 01/03/2011 - 01:47
Sensor resolution, lens resolution and image quality
I would invest in quality scenery .... http://www.boston.com/bigpicture/ I'm somewhat of a hypocrite because I've spent thousands on lenses, but it's taught me on thing .... you can still take a world class picture on a £40 lens. ...
Posted by Smeggypants on 01/03/2011 - 03:46
Sensor resolution, lens resolution and image quality
I have just been reading Frogfish's excellent thread as I am thinking of making the same change. Whilst I was pondering this I wondered about other factors than the lens in getting the best image quality. Everything comes with a price, usually for a reason. Then there are rate limiting steps and dim...
Posted by Smeggypants on 01/03/2011 - 03:52
