Search results for 'sensor cleaning' - page 109
SDM issues? A straw poll.
the AF sensor also needs contrast, it will for example not lock on the blank walls here, might that have been the problem? I also found that it helps when you manually put the focus nearly correct, it mostly snap on instantly.
Posted by Anvh on 01/10/2009 - 10:07
SDM issues? A straw poll.
The scene was full of contrast and the lens started focusing and the scene was pretty much in focus but the focus never settled. And, the AF mode was NOT AF.C I might add. /F the AF sensor also needs contrast, it will for example not lock on the blank walls here, might that have been the prob...
Posted by FredEriksson on 01/10/2009 - 10:20
Going on vacation and need advice on lenses
Don's beaten me to it (nothing new there), but here you are anyway. By the way, the latest 50-200 IS weather-resistant. 28-70 is not a wide-angle zoom on a Pentax DSLR. The sensor is smaller than a 35mm film frame, so you get a cropped image. 28mm looks like 42mm on a film camera. I suspect...
Posted by George Lazarette on 30/09/2009 - 20:37
Going on vacation and need advice on lenses
Don's beaten me to it (nothing new there), but here you are anyway. By the way, the latest 50-200 IS weather-resistant. 28-70 is not a wide-angle zoom on a Pentax DSLR. The sensor is smaller than a 35mm film frame, so you get a cropped image. 28mm looks like 42mm on a film camera. I suspect...
Posted by Don on 30/09/2009 - 20:39
Next lens advice..
By better shots I mean that a prime will be much better glass than a zoom and produce sharper images (supposedly). Possibly, even probably, but you need to weigh versatility against that extra sharpness. Modern zooms are generally very sharp. Will the 17-70 be a much better lens that my kit l...
Posted by womble on 07/10/2009 - 15:44
New (Old) lenses
Well having got home and examined the lenses and checked the PF lens database I'm more than thrilled with what was in the parcel, they are all in perfect condition, no fungus, scratches, cleaning marks or sticky diaphragms and the finish is only slightly worn. I now see why you say I got a bargai...
Posted by gregmoll on 09/10/2009 - 17:07
28, 35, or 50mm as standard lens?
Aladab One bit of advice I would give is that whatever lenses you go for (the A's are a good choice), to get a hood for it too. The older glass, while being of excellent build and optical quality, were not designed with the digital sensor in mind. As the DSLR is more susceptable to flare than fil...
Posted by pschlute on 09/10/2009 - 19:36
28, 35, or 50mm as standard lens?
Agree the 35mm FA is a great lens if you can find one at a price you can live with. If you can find the 21mm for £250 buy it anyway - you could sell it secondhand for more than that! I think £350 plus is more like the going rate for that one, and it's heading to £500 in some places. I have ...
Posted by JonSchick on 09/10/2009 - 23:07
12-24mm on full frame K7.....
Hello, Just got a big job doing interiors so I'm going to treat myself to a new lens, was looking at sigma 10-20mm but read that it would vignette images on full frame sensor.... Have K10, K20 and K7 and want to use the K7 for it's Full frame-ness. Just wondering if the 12-24mm is designed fo...
Posted by kissmekate on 13/10/2009 - 19:30
12-24mm on full frame K7.....
I think you are confusing some of the industries confusing terms.... 100% viewfinder view is not the same thing as Full Frame... Full Frame is a sensor the same size (24x36mm) as a frame of 35 mm film. The k7 has an aps sized sensor... you'll get the same "cropped" feild of view on the k7 as you ...
Posted by Don on 13/10/2009 - 19:35
12-24mm on full frame K7.....
Ahhh I see.... okay indeed I am confusing full frame viewage with the sensor and have done so because I read about the sigma 10-20mm vignetting when on a full framer, didn't realise there was a full frame sensor and FF viewfinder, and that they were separate things... I don't really know my onions ...
Posted by kissmekate on 13/10/2009 - 20:52
12-24mm on full frame K7.....
So I guess with a full frame sensor you don't get the crop factor that changes the effective focal length of the lens? I mourn my 6x6. Yes you wouldn't have to do that since the size of full-frame sensor equals that of 35mm film, but that isn't the same as it is on 6x6 film though. Of the two len...
Posted by Anvh on 13/10/2009 - 21:31
Pentax/Samsung 10-17mm fisheye
I've thought about buying a Tokina version & getting the hood shaved off to work on full frame, but I'm not sure how much of an issue flare & contrast loss would become. Pentax had the 17-28mm which was fisheye on full-frame, still have it and still use it. Not fisheye on the smaller digital sens...
Posted by Galoot on 14/10/2009 - 01:10
Even the 31mm Ltd may not be up to the optical challenge?
I'm sure that Pentax will make some new "revised" lenses for the 645D. Also there is much less demand for a wide range of lenses as well. The film 645 had a much smaller lens selection compared to 35mm. However, as per the last shown prototype, the 645D will probably use a "cropped" 1.3x 31MP Kod...
Posted by RichardDay on 17/10/2009 - 11:34
Even the 31mm Ltd may not be up to the optical challenge?
Who, precisely, is us? It has been known for years that most older lenses wouldn't cut it on a 135 sensor (as Canon owners have found), and that if Pentax were to produce such a beast they would have to design and make a shed-load of new lenses, and all for a very small market. I do have enorm...
Posted by George Lazarette on 17/10/2009 - 11:46
Even the 31mm Ltd may not be up to the optical challenge?
Agree that size is just as important to picture quality with digital sensors as it is for film. But if size were the only criterion, we would all be lugging full plate cameras around. The bulk and cost of larger cameras dictates that we compromise, and Pentax bet the farm on the fact that APS-C wo...
Posted by George Lazarette on 17/10/2009 - 13:11
Even the 31mm Ltd may not be up to the optical challenge?
I found the jump from 35mm to 645 not enough of a quality step. I really should have gone for the 67, but as always it's easy to be wise after the event. There is actually a difference in format size to quality expectations with digital. Certainly as regards resolution, 20MP is 20MP regardless of...
Posted by johnriley on 17/10/2009 - 13:31
Even the 31mm Ltd may not be up to the optical challenge?
Sorry guys, but I'm not going to find the link for you. However, somewhere on the net there are pictures taken with a Canon FF and a modified 31 ltd. Seen on Pentaxforums I believe. Here's something I don't quite understand. If resolution from the FA ltds is not good enough for digital, why are ...
Posted by hefty1 on 18/10/2009 - 15:12
Even the 31mm Ltd may not be up to the optical challenge?
Well, a FF camera won't make the FA31 appear any worse than when used on APS C, just that it may not appear any better than on APS C although I am not so sure this is the case. There are two reasons the lens may look worse, Lance. First, on a larger sensor all lenses will look worse (unless they n...
Posted by George Lazarette on 18/10/2009 - 16:25
Even the 31mm Ltd may not be up to the optical challenge?
Well, a FF camera won't make the FA31 appear any worse than when used on APS C, just that it may not appear any better than on APS C although I am not so sure this is the case. There are two reasons the lens may look worse, Lance. First, on a larger sensor all lenses will look worse (unless they n...
Posted by Lance B on 20/10/2009 - 03:17
