Search results for 'sensor cleaning' - page 177
Shutter problems. Any ideas before my *istD goes back?
I was wondering when someone would ask how i measured the speeds :) Basically its very simple - if you have the right gear.... I shine a beam of light into the camera which reflects off the sensor to a photo diode wired in series with a resistor to a power supply. I then use a digital storage os...
Posted by stanwax on 20/12/2004 - 18:33
Shutter problems. Any ideas before my *istD goes back?
I had a similar problem with a brand new 77mm lens. A really good cleaning of the contacts fixed the problem.
Posted by Anonymous on 21/12/2004 - 22:44
Power supply for *ist-D
Hi all, I've just ordered a supply for my *ist-D: http://www.7dayshop.com/catalog/product_info.php?products_id=8158 (A good idea when doing CCD cleaning etc). I'll let you know how it fairs when I get it ;) Matt
Posted by MattMatic on 26/01/2005 - 12:57
Power supply for *ist-D
Correction :oops: It does work. There are two yellow tipped plugs - the larger of the two fits, but you must push it home properly. Also, make sure that the Tip sign on the lead matches up with the + sign of the plug. The thing that caught me out: I was trying it with the battery compartment d...
Posted by MattMatic on 11/02/2005 - 07:44
Problems using *ist DS with 3rd party lenses?!?
I have heard that Sigma refuse to pay a royalty [...] I have also heard that Sigma has been known to re-chip older lenses where a problem has been observed. Oh I see. Bear in mind too, that this alleged problem with under-exposure seems only to affect a very few people, but of course they will ma...
Posted by HerrB on 12/02/2005 - 17:46
Shots of lightning during the day
I've had luck in the past with very slow iso (200 is the slowest on ist D) and very tight f-stop. Try the highest f-stop on your lens, but make sure your sensor is clean first or you'll have a bit of touch-up to do afterward. Needless to say, night lightning pictures often look more appealing beca...
Posted by Anonymous on 16/02/2005 - 16:02
*ist DS Test in AP
One point I am trying to make is that the testing of a DSLR needs a different approach to that of testing a film SLR. Tests on a film SLR body do not normally comment on the sharpness of the image because that is down to the lens used and, to a lesser extent, the film. However, tests on a DSLR...
Posted by Malcolm Riches on 19/02/2005 - 17:00
*ist DS Test in AP
I suppose in film photography we are always shooting at the optimum resolution, only limited by the film used. But in essence it is always the best quality. In digital cameras it depends on not only the lens, but how this interacts with the sensor and again how we save the images (RAW, TIFF or JP...
Posted by johnriley on 19/02/2005 - 19:00
*ist DS Test in AP
Many thanks for your comment. I must admit that I have not felt a similar bias against Pentax. However, in the 4 way test you mentioned, was any mention made of the lenses used with each camera? My argument is that digital image quality is a combination of the lens used AND the sensor .... and...
Posted by Malcolm Riches on 22/02/2005 - 14:13
*ist D
Kim C's post about the 18-35 lens going for £80 prompted me to look for the lowest prices on the *ist D, and, lo and behold, the camera can now be had for £649 with the 18-35 at Empire Direct, and for £600 body-only at Park. The DS, a slightly less flexible camera, now costs more than the D. At t...
Posted by George Lazarette on 03/03/2005 - 11:31
Pentax film SLR lenses on Pentax Digital camras
No, the digital sensor is smaller than the 35mm frame, so effectively you only use the central part of any lens' field of view. If you multiply the actual focal length by 1.5x then you will get an idea of the "equivalent" focal length. The most recent DA lenses only cover the CCD and if you use t...
Posted by johnriley on 26/03/2005 - 19:07
Pentax film SLR lenses on Pentax Digital camras
The main effects of the smaller sensor are: 1 Every lens effectively has it's angle of view reduced, so a 200mm becomes a 300mm, etc. This is great if you always wanted a longer lens, but couldn't afford it, but it's less good news at the other end. Your nice wide 28mm lens becomes a 42mm. Ma...
Posted by George Lazarette on 26/03/2005 - 22:40
Pentax film SLR lenses on Pentax Digital camras
One other difference with the so-called 'digital only' lenses that hasn't been mentioned so far is the lens coatings. Digital lenses have, amongst others, an anti-ghosting coating to prevent the problems of internal reflections. This is not such an issue with film, but it is, or can be, a problem w...
Posted by Mannesty on 23/08/2006 - 15:40
PLEASE pentax: sell a pro-level digital SLR!
I think you've hit on an important point there - give the users what they want. But what do the users want? The best quality at any price? The cheapest mega-zoom for 6 x 4 prints? Somewhere in the middle is the compromise, and although there will be some takers at both ends of the spectrum I suppose...
Posted by johnriley on 09/05/2005 - 16:10
PLEASE pentax: sell a pro-level digital SLR!
There's a fair bit we agree on there, George. Just to explain more clearly what I meant, if I may I will use an analogy. If we take the M series of cameras, then my feeling is that in terms of the ergonomics, they match perfectly with the smaller and lighter M series lenses. This is not to say th...
Posted by johnriley on 09/05/2005 - 17:40
PLEASE pentax: sell a pro-level digital SLR!
Full frame 11mp sensors will only ever come down in price, so before long Pentax won't be able to use that excuse any more. :roll: Ok so I looked up the prices in the US of full frame Pro DSLRs. $3k won't get you anywhere at all! Canon 1Ds mark II, full frame costs $8k. Nikon D2X, full frame cos...
Posted by MattMatic on 10/05/2005 - 07:06
PLEASE pentax: sell a pro-level digital SLR!
Matt, please, don't bring logic and facts into this! Taking up your point about lenses; there are two downsides to using 35mm lenses on APS digital, and two compensating upsides. You know all this of course, but I'm repeating it anyway! First is the obvious point that your nice wide 24mm lens...
Posted by George Lazarette on 10/05/2005 - 08:50
PLEASE pentax: sell a pro-level digital SLR!
The issue of full frame sensors is a red hering. Most professionals who use medium format can use most of the image area in the usual 8x10, 11x14, 16x20 print sizes. Full frame 35mm is 2:3 aspect ratio, not very useful for anything but snapshots. I'm really depressed about this. You'd think th...
Posted by Anonymous on 06/07/2005 - 03:41
PLEASE pentax: sell a pro-level digital SLR!
Everyone seems to get really upset about this, but Pentax has a small market share compared to Canon and Nikon and as technology moves on quickly these days I guess it is more ecomical for their (subcontracted?) manufacturing plants to tool up for a single production run of a camera with a set numbe...
Posted by Anonymous on 25/07/2005 - 23:49
PLEASE pentax: sell a pro-level digital SLR!
George Lazarette wrote: "(...) First is the obvious point that your nice wide 24mm lens becomes a less wide 36mm (in angle of view terms). So you need to invest in a new wide-angle. (...) But at the other end your bog-standard 200mm f4 is suddenly a 300mm f4. Good 300mm lenses cost a lot of mone...
Posted by artykris on 28/07/2005 - 14:03
