Search results for 'sensor cleaning' - page 84
12-24mm DA finally announced!!
Well, there are other lenses that do not have apeture rings and are meant for full frame cameras. The Pentax SMC-FA-J 18-35mm f/4-5.6 AL - Auto Focus Zoom is listed as suitable for 35mm cameras, but what if I want to use it on my MX cameras? Just because I own a fancy digital pro camera doesn'...
Posted by Arthur Dent on 29/08/2005 - 03:26
My lenses and going digital
Welcome aboard Juno 60. We've pretty much covered this subject recently and you'll find a number of threads relating to member's experiences. Your lenses will be perfectly usable but you'll need to bear in mind that the effective focal length is increased by approx 1.5x due to the digital sensor...
Posted by Kimbo on 25/08/2005 - 16:39
My lenses and going digital
Optically, will the SMC A's give comparable results to Pentax's new-fangled digital lenses? I've no experience of the new lenses and have only just acquired an *istDL myself but I suspect that they are very good indeed. Older A, F and FA lenses have increased in value recently because of their usab...
Posted by Kimbo on 25/08/2005 - 17:59
My lenses and going digital
You're most welcome and I'm sure you'll be delighted when you take the plunge! I've owned a Trust 910Z powercam (digital zoom compact) for nearly two years and think it's terrific - quality Samsung lens, Sony sensor, 5MP effective resolution etc. and can't fault it for the price. Now with the DL...
Posted by Kimbo on 26/08/2005 - 03:28
My lenses and going digital
Well, I suppose an APS size sensor with 10+ megapixels would satisfy the needs of most pro's and it would be nice to see Pentax DSLRs being used in the media etc. I think Canon ought to be challenged in this area and perhaps Pentax should produce a full 35mm sized flagship model!
Posted by Kimbo on 27/08/2005 - 04:22
My lenses and going digital
Well, I suppose an APS size sensor with 10+ megapixels would satisfy the needs of most pro's and it would be nice to see Pentax DSLRs being used in the media etc. The next version of the chip used in the Pentax and Nikon DSLR's is to have 12 megapiels. That ought to be enough to keep you going fo...
Posted by Arthur Dent on 27/08/2005 - 16:39
new Macro lens
Many lenses exhibit CA on digital more than film, as the light is ever so slightly scattered by the film base. Another theory is that the small lenses over the photosites cause it, but I suspect with really sharp film you'd still see it. I don't think it's a digital sensor thing. The only way I...
Posted by Arthur Dent on 09/09/2005 - 14:53
new Macro lens
My view is that there is not much more (if any) CA on digital than with film, but manufacturers try to persuade us that digitally-optimised lenses are better because that way they sell more lenses. I'd be very interested to see some real-life side-by-side comparisons of the same lens in the same ...
Posted by George Lazarette on 09/09/2005 - 21:04
Sigma 50-500mm for Pentax *ist DS
The 80-320 is certainly a highly regarded lens but I would imagine that the 70-300 FAJ is pretty good too. Bear in mind that you do need fairly small apertures in order to get a really sharp image from zoom lenses and telephotos also require a fast shutter speed to reduce the effects of camera shak...
Posted by Kimbo on 19/09/2005 - 17:46
Looking to buy Pentax FA 50mm F1.4
I don't agree about the resolution being "wasted". I have a number of very sharp Pentax lenses, including the three original Limiteds, two macros, five 50/55s - from f1.2 to f1.8 - and none of them are too sharp for the sensor. George
Posted by George Lazarette on 17/09/2005 - 19:11
Hoya IR Filter 55mm to trade.
Had you considered step-up/down rings? With the smaller sensor on the DS you can probably use the 55mm filter on a 62mm lens without vignetting. I can use a 49mm on my 58mm FA 1:2.8 100mm macro.
Posted by George Lazarette on 18/09/2005 - 17:22
18-55 DA Query
There's a big difference between K and M lenses, and the latest AF lenses. The biggest difference is that the focussing mechanism on autofocus lenses has to be very easy to operate, so as to minimise the size and battery consumption of the AF motor. Gone is the heavily greased helicoid, which fe...
Posted by George Lazarette on 20/09/2005 - 09:57
Pentax Macro 50MM
Actually, Gentlemen, this type of lens sounds like just the ticket for photographing flowers and plant life? It also seems that the front lens element is recessed considerably, precluding the need for a UV or 1A filter simply for protection? I'm always cleaning my lenses and filters, but not need...
Posted by Anonymous on 20/09/2005 - 22:55
Filters & Light Refraction
Hi Mac, The choice of filters is a difficult one and ultimately will depend on how you intend to use the camera and your choice of film. If you keep a lens cap on for most of the time and only remove it to take a photo, you probably don't need a filter. I tend to leave the cap off most of the time ...
Posted by Kim C on 14/10/2005 - 12:45
Why not a 50-135mm zoom lens?
Minolta, Nikon and Canon have all at one time offered a 50-135mm zoom lens. I wonder why Pentax never did? It would be a perfect zoom for the digital SLR's with the APS-C sensor. It would cover basically the same angles as the 70-210 did with the full frame cameras. How about it, Pentax, it ...
Posted by Arthur Dent on 24/10/2005 - 22:22
Why not a 50-135mm zoom lens?
Hi, Maybe not a 50-135 but they have done a 45-125. I know, I have one! http://www.bdimitrov.de/kmp/lenses/zooms/medium/K45-125f4.html They also do a 50-200 which covers this range specifically for the digital sensor http://www.bdimitrov.de/kmp/lenses/zooms/medium/DA50-200f4-5.6.html
Posted by Kim C on 24/10/2005 - 22:27
Internal Lens Service?
Could someone recommend a good, reasonably priced internal lens cleaning service in the New York City area?
Posted by KMark on 06/11/2005 - 05:51
Pentax 40mm f2.8 da af "pancake"
It is a new autofocus design for the smaller APS format CCD sensor, has no aperture ring, is optimised for digital capture. The SMC Pentax-M 40mm f2.8 is a manual focus lens for the M series cameras, with no A setting on the aperture ring. It can be used on the DSLRs but with limited functionalit...
Posted by johnriley on 25/11/2005 - 07:53
Fast fifties - info please!
I have the A 1.4 amd the M 1.4. Both are superb lenses, the A is obviously easier to use on the *st D, but they both give excellent results. FYI, the 50mm functions as a portrait lens on the smaller sensor of the digital cameras.
Posted by Arthur Dent on 27/11/2005 - 16:28
Oil on diaphragm - is it a problem ?
If you are sending the Super A to robin . . . The Super-A has gone off to Robin for a full service and seal change, together with an old SMCPKA 50mm 1:1.7 lens who's aperture ring refuses to move. I'll follow your advice and send the 135mm lens for cleaning in the new year. In the meantime I've j...
Posted by Mannesty on 07/12/2005 - 23:27
