All Forum Comments
Comment by Daniel Bridge posted on Photoshop Elements 9 at 20/02/2011 - 00:44
Whether there are differences in the actual light levels hitting the sensor or not, the two lenses the OP asked about do have different characteristics, and I did a quick wide aperture comparison a few years ago.
https://www.pentaxuser.com/forum/topic/fa50mm-1-4-v-a50mm-1-7-5512
Hope that helps.
Dan
https://www.pentaxuser.com/forum/topic/fa50mm-1-4-v-a50mm-1-7-5512
Hope that helps.
Dan
Comment by Daniel Bridge posted on Difference between Pentax f/1.4 and f/1.7 at 04/02/2011 - 17:53
Posted mine the week before Christmas and got it in my bank on the 31st December, which I considered exceptionally good!
Dan
Dan
Comment by Daniel Bridge posted on Pentax 2010 K-5 & K-r Cashback thread at 15/01/2011 - 23:01
SmutjeUK wrote:
Now I wonder if it could be Oil Splatter or some other kind of surface 'dirt' that you may be able to clean as your first test was clean of any fault.
Please do not get me wrong here, I am not sure myself what is going on but most that have the fault seem to have it right from the first picture. I am only go by what is posted in various forums and what Pentax seemed to have said where the fault is.
I would see if a clean would work and if not I would say that you get back to the retailer and see what they say but I may would leave out the part that the sensor was clean in the beginning, just in case that they get funny.
SRS seem really to go the extra ten miles with replacements and you should be good if you got the camera from them but if you got another retailer it seems a bit of hit and miss of how they deal with the problem.
One thing that I learned out of this is that I will get myself a second body after I got the lens I need so that I be able to carry on working if I have a problem and need my camera repaired/replaced again.
I tend to get a K20D with Grip purely as you can get them cheap(ish) but I may wait a bit longer and get the K-7 as I can make use of my extra spare batteries I got for my K-5 and I can use the grip as well (also I probably would get a third party one then as well as they are relatively cheap anyway compare to the Pentax one).
Just as an update, I have since given the sensor a wet clean, and the marks remain. I'm not worried as the camera's being swapped out by the retailer, but just confirming that I had no problem, then the mark appeared, and a wet clean did not move any of it, so I can presume from this it's not oil, and the mark is not a fault in the glass.Daniel Bridge wrote:
3821xxx
Although the original test shots I took showed a very small single spot to one side of the frame at f/32, I just wasn't worried about it, as I never shoot smaller than f/16 and it simply wasn't a problem.
The marks that have appeared are near the centre of the sensor.
First shot, no marks, K-5 with DA*300mm lens at f/32, 7th December
Second shot, marks, K-5 with DA*300mm lens at f/32, 13th December
These are both 100% crops of the same region of the sensor.
Even with heavy processing, I just can't see anything in this region on the earlier shot, not even faint marks.
Dan
According to this post link that 'Sapphie' posted in the "K5 Sensor Issues..." thread the fault is in the glass and not between the AA Filter and the Sensor, that would mean that any fault would be visible right from the start. 3821xxx
Although the original test shots I took showed a very small single spot to one side of the frame at f/32, I just wasn't worried about it, as I never shoot smaller than f/16 and it simply wasn't a problem.
The marks that have appeared are near the centre of the sensor.
First shot, no marks, K-5 with DA*300mm lens at f/32, 7th December
Second shot, marks, K-5 with DA*300mm lens at f/32, 13th December
These are both 100% crops of the same region of the sensor.
Even with heavy processing, I just can't see anything in this region on the earlier shot, not even faint marks.
Dan
Now I wonder if it could be Oil Splatter or some other kind of surface 'dirt' that you may be able to clean as your first test was clean of any fault.
Please do not get me wrong here, I am not sure myself what is going on but most that have the fault seem to have it right from the first picture. I am only go by what is posted in various forums and what Pentax seemed to have said where the fault is.
I would see if a clean would work and if not I would say that you get back to the retailer and see what they say but I may would leave out the part that the sensor was clean in the beginning, just in case that they get funny.
SRS seem really to go the extra ten miles with replacements and you should be good if you got the camera from them but if you got another retailer it seems a bit of hit and miss of how they deal with the problem.
One thing that I learned out of this is that I will get myself a second body after I got the lens I need so that I be able to carry on working if I have a problem and need my camera repaired/replaced again.
I tend to get a K20D with Grip purely as you can get them cheap(ish) but I may wait a bit longer and get the K-7 as I can make use of my extra spare batteries I got for my K-5 and I can use the grip as well (also I probably would get a third party one then as well as they are relatively cheap anyway compare to the Pentax one).
Dan
Comment by Daniel Bridge posted on K5 Poll at 12/01/2011 - 20:49
...and:
Dan
Quote:
4-) the problem IS, or ISNīT. Pentax declares that once they know that the problem is in a defect of the construction of the glass, it's not something that can change with time, as sometimes we have supposed, due to heat or oil, or something like that.
That's not my experience!4-) the problem IS, or ISNīT. Pentax declares that once they know that the problem is in a defect of the construction of the glass, it's not something that can change with time, as sometimes we have supposed, due to heat or oil, or something like that.
Dan
Comment by Daniel Bridge posted on K5 Sensor Issues... at 14/12/2010 - 00:55
Unfortunately Sandinista's confirmed that his entry was taken in November, so I've deleted it for him. Shame, cos I liked it. Perhaps he still has the bottle opener...
Dan
Dan
Comment by Daniel Bridge posted on Discussion for fortnightly competition #57: Mono/Chrome at 14/12/2010 - 00:50
In photome, the total shutter count is 968, about 700 of those are mine. I have done a few short videos, and used live view very briefly, but not between clear shots and marked shots.
Dan
Dan
Comment by Daniel Bridge posted on K5 Poll at 13/12/2010 - 14:30
Assuming file numbers are sequential, about 80.
Dan
Dan
Comment by Daniel Bridge posted on K5 Poll at 13/12/2010 - 14:07
3821xxx
Although the original test shots I took showed a very small single spot to one side of the frame at f/32, I just wasn't worried about it, as I never shoot smaller than f/16 and it simply wasn't a problem.
The marks that have appeared are near the centre of the sensor.
First shot, no marks, K-5 with DA*300mm lens at f/32, 7th December
Second shot, marks, K-5 with DA*300mm lens at f/32, 13th December
These are both 100% crops of the same region of the sensor.
Even with heavy processing, I just can't see anything in this region on the earlier shot, not even faint marks.
Dan
Although the original test shots I took showed a very small single spot to one side of the frame at f/32, I just wasn't worried about it, as I never shoot smaller than f/16 and it simply wasn't a problem.
The marks that have appeared are near the centre of the sensor.
First shot, no marks, K-5 with DA*300mm lens at f/32, 7th December
Second shot, marks, K-5 with DA*300mm lens at f/32, 13th December
These are both 100% crops of the same region of the sensor.
Even with heavy processing, I just can't see anything in this region on the earlier shot, not even faint marks.
Dan
Comment by Daniel Bridge posted on K5 Poll at 13/12/2010 - 13:53
Well, having voted 'no' to marks on my sensor, and having the shots to prove it, this morning I took some ice photos, and was shocked to see significant marks have now appeared.
So in my case, no amount of QC of cameras coming off the production line could have spotted my problem, and perhaps this is a reason why it wasn't picked up there generally?
Gutted, both for myself (although I know it will get sorted one way or another), but also for Pentax. If these marks are under the AA filter, and they appear where once they weren't... Who knows what this means?
Dan
So in my case, no amount of QC of cameras coming off the production line could have spotted my problem, and perhaps this is a reason why it wasn't picked up there generally?
Gutted, both for myself (although I know it will get sorted one way or another), but also for Pentax. If these marks are under the AA filter, and they appear where once they weren't... Who knows what this means?
Dan
Comment by Daniel Bridge posted on K5 Poll at 13/12/2010 - 13:29
http://www.cameraworld.co.uk/ViewProdDetails.asp?prod_code=PON09L000072&Prod_nam...
Dan