Search results for 'sensor cleaning' - page 97
SIGMA 10/20 ON PENTAX
To be honest, clarity and sharpness are pretty much impossible to judge at this size. They look fine to me, but they may well be unsharp when viewed full size. Likewise, sharp images can be rendered fuzzy by careless resizing. To me, the thing that stands out is their lack of contrast. The lig...
Posted by Daniel Bridge on 29/04/2008 - 20:56
SIGMA 10/20 ON PENTAX
Thanks Daniel I thought that might be the case re the size of the files. My main concern is the lens is sharp just loaded the pic's from my comp as is without any work on them. I will have to give the sensor a clean as you say thanks for the help.
Posted by philstaff on 29/04/2008 - 21:54
DA* lens tests - technique and advice appreciated!
First and foremost: consistent environment. Not just consistent, but totally static and immutable in all regards other than the lens you are comparing with. It sounds like you will have all of that covered with the mounting and studio environment your have at the shop. RAW v.s. JPEG should no...
Posted by amoringello on 05/05/2008 - 21:39
ANy way to remedy this? Garbage inside lens...
Anyone know how to remedy something like this? Not a 100% crop, this is just a scaled down image. This is with my DA* 16-50 lens! I can open the aperture and look through the lens and see the crap stuck to the glass inside. Those are some pretty poor seals if it lets that sort of crap in!...
Posted by amoringello on 11/05/2008 - 23:29
Help Should I sell my Limited lenses ?
My wife has the *ist-DS and I have the *ist-D and a K10D. One of the things that gets me with the *ist-DS is the focus point is usually set to automatic - and the camera often gets it wrong :roll: Personally, I prefer centre-only focus. The *ist-DS has a menu option to change to centre only (and...
Posted by JohnMcD on 13/05/2008 - 14:54
lens or body faulty?
would someone check these full size images please? was taken from a tripod with everything perfectly square in the view finder and auto-focused. several shots all display wonky like this. and all shots display apparent back focus. shows the test chart at 45 degrees. red focus indicator we...
Posted by Darkmunk on 15/05/2008 - 13:07
lens or body faulty?
Not sure if it is clear in this image... And maybe my testing is flawed, but whether you focus with the line at the top of the AF area or at the bottom of the AF area does make a difference. Of course this movement adjusts distance, relative size, etc... but all of that is part of making the ima...
Posted by amoringello on 17/05/2008 - 02:35
New Lens??
Don't forget focus distance is measured from the sensor, not the front of the lens. Even so, this does sound as though it focuses within the specified range. :D Dan
Posted by Daniel Bridge on 19/05/2008 - 18:41
fixing lens distortion on sigma 10-20
thank you all for your comments. if the distortion specified is normal then i have to invest time fixing most of the pictures which is a pain. if only lightroom could sort that out as well. I had a go at fixing the perspective in Photoshop. This is with the maximum amount of correction avail...
Posted by ChrisA on 18/05/2008 - 20:34
Wide & Fast
Well I am utterly confused then, I thought the whole point of Pentax and other makers bringing out 'digital' lenses were for digital cameras to get the true focal lenghth of the lens, as stated on the box. :? :? :? No. A lens doesn't have to have such a large image circle for digital, so lenses...
Posted by iceblinker on 30/05/2008 - 13:19
Wide & Fast
What an amusing discussion!!! Lilly, I find myself in exactly the same position as you. I have a wide zoom (particularly a fisheye) and a 50mm f1.4. i also have various zooms that cover the space in between. Like you I find myself needing a "something in between" these focal lenghts ...
Posted by nathanever82 on 30/05/2008 - 14:34
Lenses to replace kit lenses?
Hi Dan Thanks for the response. I did not know that Pentax were producing a 17-70. I already have an old A series manual focus 50 1.4, would that still be reasonable quality given that it is on an APS-C sensor camera, and I don't mind focussing? Tim
Posted by timbo on 28/05/2008 - 20:04
Lenses to replace kit lenses?
I already have an old A series manual focus 50 1.4, would that still be reasonable quality given that it is on an APS-C sensor camera, and I don't mind focussing? Should do, my FA50 is gorgeous. :wink: Dan
Posted by Daniel Bridge on 28/05/2008 - 20:49
Tamron 28-300mm distortion
did you use flash? could be the the background in motion, combined with sr to create the blocky, multi exposure effect....it seems to me that the sensor vibrates to counter motion at the point of focus, so wouldn't that impact the areas not in focus? and wouldn't the effect be more pronounced the...
Posted by Don on 03/06/2008 - 14:39
Lens Help please ... Solved & broke!
If you really want to know what people think about filters, you should search for the several threads where the debate pro- and con- has raged. In summary: - evidence for actual image degradation (other than wide-angle vignetting) with a filter seems anecdotal at best - SMC coatings are to...
Posted by ChrisA on 03/06/2008 - 21:16
Tamron 28-75mm f2.8 Di SP AF Lens
I have this lens. Its quite chunky (being capable of delivering 35mm full frame coverage - ready for when Pentax go full frame... :wink: ) I haven't done any of the sharpness/ CA etc tests that some get up to with their lenses, but being a full frame lens it is obviously working in its sweet-sp...
Posted by alfpics on 05/06/2008 - 09:36
Which lense??
It's often thought that landscapes = wide angles, but that leads to a lot of disappointment. Wide angles, especially ultra-wides are not easy to handle and need very careful and bold composition to succeed. For example, distant mountains can look incredibly weak and uninspiring. Exactly! I often ...
Posted by rparmar on 11/06/2008 - 01:23
Which lense??
Badbrother.... I don't understand much of the trouble you've had. I sell mostly 16x20 to 20x30 inch prints. I have both the kit 18-55 and the 16-45. your results don't sound right. and as for the "portrait mode issue" in depressing review...well...don't they only publish Pentax review...
Posted by JohnMcD on 11/06/2008 - 20:48
Which lense??
It is entirely possible that a lens could have "portrait softness" as due to the rectangular shape of the sensor and film format the extreme edges at the sides are using more extreme edges of the image circle. I can't see how this can be so? Regardless of whether you take the photo with t...
Posted by hefty1 on 11/06/2008 - 22:19
Which lense??
It is entirely possible that a lens could have "portrait softness" as due to the rectangular shape of the sensor and film format the extreme edges at the sides are using more extreme edges of the image circle. I can't see how this can be so? Regardless of whether you take the photo with t...
Posted by JohnMcD on 14/06/2008 - 20:52
