Help me with a weird problem
Posted 17/04/2011 - 10:39
Link
NaimKhan wrote:
Come on guys give me some credit. I have been taking photographs for long enough to know when there is camera shake. The picture you see is exactly what I saw in the viewfinder. When I started the thread I hadn't evrn taken a photo - I had been talking about what I saw in the viewfinder.
Cheers
Naim
I stick with my previous comment re low quality filter. What brand is yours?Come on guys give me some credit. I have been taking photographs for long enough to know when there is camera shake. The picture you see is exactly what I saw in the viewfinder. When I started the thread I hadn't evrn taken a photo - I had been talking about what I saw in the viewfinder.
Cheers
Naim
I'm guessing because the 300mm has very small field of view, it uses a very small section of the filter. So whatever imperfection is magnified.
In any case, try using a stable surface (instead of hand-held) to take out any possible effect of camera shake.
[IMG]http://i292.photobucket.com/albums/mm33/testdasi/Images/Pentax%20K-5/pk5sig.gif[/IMG]====================================
My Flickr
My PPG
The Rotary Shutter
My Flickr
My PPG
The Rotary Shutter
Posted 17/04/2011 - 10:50
Link
NaimKhan wrote:
... When I first looked in the viewfinder I thought I had changed the diopter by accident.
I think that testdasi is right based on the above.... When I first looked in the viewfinder I thought I had changed the diopter by accident.
testdasi wrote:
I stick with my previous comment re low quality filter. What brand is yours?
I stick with my previous comment re low quality filter. What brand is yours?
Pentax K10D + Vivitar 55/2.8 macro + Super Takumar 55/1.8 + SuperMultiCoated Takumar 85/1.8 + SuperMultiCoated Takumar 135/3.5 + SuperMultiCoated Takumar 200/4 + Super Takumar 300/4
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)
Posted 17/04/2011 - 11:16 - Helpful Comment
Link
I suppose the problem is the Filter. For some reason the AF on the camera gets in conflict with the circular lines of the POLA.
The solutions are two:
1) Test the lens with a linear Pola.
2) Lock the focus with AF-Lock button and then insert the POLA. If it is still blurry the best use you can do with your CPL is transform it in a UFO and shot it . Then sell the picture to some Sci-fi magazine and take the money to buy a better one.
But it is still strange that the CPL on the other lenses works , but on the 300 star not. Then you lose only one stop while using the CPL. I have a Cokin Circular and B+W linear and in both of them I loose two stops.
Strange filter
Ciao
Alberto
The solutions are two:
1) Test the lens with a linear Pola.
2) Lock the focus with AF-Lock button and then insert the POLA. If it is still blurry the best use you can do with your CPL is transform it in a UFO and shot it . Then sell the picture to some Sci-fi magazine and take the money to buy a better one.
But it is still strange that the CPL on the other lenses works , but on the 300 star not. Then you lose only one stop while using the CPL. I have a Cokin Circular and B+W linear and in both of them I loose two stops.
Strange filter
Ciao
Alberto
Posted 17/04/2011 - 11:56
Link
Algernon wrote:
Probably the 2 stops or so lost through the filter causing
camera shake.
Even the 2nd shot should be sharper it's a top lens.
Edit: Just noticed they are both 1/60th and the iSO was changed. You need at least 1/300th with a 300mm lens?
It still looks like camera shake.
Actually on APS-C it becomes more like 1/500th because of the field of view.
Probably the 2 stops or so lost through the filter causing
camera shake.
Even the 2nd shot should be sharper it's a top lens.
Edit: Just noticed they are both 1/60th and the iSO was changed. You need at least 1/300th with a 300mm lens?
It still looks like camera shake.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Posted 17/04/2011 - 12:05
Link
gartmore wrote:
It depends on the user plus the SR helps. I'm happy with 1/200th and I think most would manage 1/300th. It would be very rare to need 1/500th with SR
Algernon wrote:
Probably the 2 stops or so lost through the filter causing
camera shake.
Even the 2nd shot should be sharper it's a top lens.
Edit: Just noticed they are both 1/60th and the iSO was changed. You need at least 1/300th with a 300mm lens?
It still looks like camera shake.
Actually on APS-C it becomes more like 1/500th because of the field of view.Probably the 2 stops or so lost through the filter causing
camera shake.
Even the 2nd shot should be sharper it's a top lens.
Edit: Just noticed they are both 1/60th and the iSO was changed. You need at least 1/300th with a 300mm lens?
It still looks like camera shake.
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
Pentax K-1 + K-5 and some other stuff
Algi
Posted 17/04/2011 - 19:57
Link
OK, for are you sceptics here are 2 more shots that I have taken with a tripod + 2 seconds delay timer. You can see that the problem remains as I mentioned previously.
More news further down
This one with the CPL:
[IMG]http://i376.photobucket.com/albums/oo209/Naim-Khan/NAIM9322.jpg[/IMG]
This one without:
[IMG]http://i376.photobucket.com/albums/oo209/Naim-Khan/NAIM9321.jpg[/IMG]
The news is that I put another CPL in front of the lens - it is not the correct size so couldn't screw it on, but what I did notice was that the view in the viewfinder was absolutely fine. So in summary, looks like I have got myself a dud CPL . I bought it abroad so can't return it either.
More news further down
This one with the CPL:
[IMG]http://i376.photobucket.com/albums/oo209/Naim-Khan/NAIM9322.jpg[/IMG]
This one without:
[IMG]http://i376.photobucket.com/albums/oo209/Naim-Khan/NAIM9321.jpg[/IMG]
The news is that I put another CPL in front of the lens - it is not the correct size so couldn't screw it on, but what I did notice was that the view in the viewfinder was absolutely fine. So in summary, looks like I have got myself a dud CPL . I bought it abroad so can't return it either.
Posted 17/04/2011 - 21:22
Link
As has been said many times, this is the filter. It is faulty and should be binned or returned.
Posted 17/04/2011 - 21:35
Link
The polarizers creating more than one image, which is why it looks like shake. It could even be letting un-polarized light through and it's that causing the blur. You can see it best on the twigs on the right the extra images run right to left.
Half Man... Half Pentax ... Half Cucumber
Pentax K-1 + K-5 and some other stuff
Algi
Pentax K-1 + K-5 and some other stuff
Algi
Posted 17/04/2011 - 22:24
Link
Polarising filters are made up of a polarising foil sandwiched between glass plates. Sometimes these de-laminate which would likely cause the problems you're seeing. Nothing you can do to repair it unfortunately.
Joining the Q
Add Comment
To leave a comment - Log in to Pentax User or create a new account.
411 posts
17 years
Wakefield,
West Yorkshire
Cheers
Naim