Size of K100D focus screeen question
Posted 27/06/2009 - 00:41
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The quivering hand picks up the tweezers and approaches the K100
Pete
Pete
K-1 K-01 Q-7
some len
Close to the Edge
Down by the River
some len
Close to the Edge
Down by the River
Posted 27/06/2009 - 00:45
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Good luck! When you do find the size don't forget to report back so we'll know if anyone asks in future
Joining the Q
Posted 27/06/2009 - 09:19
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Are they the same thickness? Might be important too.
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 27/06/2009 - 09:35
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gartmore wrote:
Are they the same thickness? Might be important too.
I have read some articles on that other forum (PentaxForums),stating they have the same thickness.Are they the same thickness? Might be important too.
There are some guys who use the screens of the MX and MG to adjust for use in the Pentax KxxxD's.
Apparently it also solves the exposure problems that occur when using non A lenses.
Martin.
Posted 27/06/2009 - 15:58
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Also there is small metal shim that separates the focus screen from the pentaprism/mirror. I have a k20d, and bought a Katzeye focus screen. The Katzeye was a tiny bit thicker than the original Pentax focus screen. Accurate focus is so easy to detect with the split prism, and it was disconcerting to see a tiny variation when using autofocus.
Rachael at Katz Eye advised me about the availability of different size shims from Pentax - I bought three and the middle one was perfect. The Pentax invoice called the shim a "focus adjusting washer".
Note that this does not affect the autofocus performance. But it is encouraging to see the image in the viewfinder is sharp when using autofocus...
Dick
Rachael at Katz Eye advised me about the availability of different size shims from Pentax - I bought three and the middle one was perfect. The Pentax invoice called the shim a "focus adjusting washer".
Note that this does not affect the autofocus performance. But it is encouraging to see the image in the viewfinder is sharp when using autofocus...
Dick
Posted 30/06/2009 - 10:13
Link
Flushed with focusing success I come with good news
Decided the tweezers needed boots.
Looks crude but held on to the wee tab with no marking. Used lens tissue if fingers needed.
The k100d screen was easily released with this finely honed tool
The numbers are in that gift to good measurement, the millimeter.
Encased in wide tape with enclosed air bubbles the MG screen contemplates its fate...the 4 inch sander, 100 grit.
Incredibly, despite failing eyes, light and grip, there is progress...
amazed that there was no dust under the tape and no damage to the screen !
Forewarned about the 'collapse onto mirror issue' I fashioned the custom screen catcher.
Had a few issues with adhesive left behind on the screen but it pulled off cleanly with sticky tape dabbing.
Couldn't get the wee tray shut with the shim in so left it out .
Results ?
Well I am just so happy with the results. have the SMC M 50/1.4 @ 1.4 onboard and she is achieving focus every time. In dim light inside, the split collar shift is a piece of cake to spot .
Well worth the effort and $ saved
cheers
Pete
Decided the tweezers needed boots.
Looks crude but held on to the wee tab with no marking. Used lens tissue if fingers needed.
The k100d screen was easily released with this finely honed tool
The numbers are in that gift to good measurement, the millimeter.
Encased in wide tape with enclosed air bubbles the MG screen contemplates its fate...the 4 inch sander, 100 grit.
Incredibly, despite failing eyes, light and grip, there is progress...
amazed that there was no dust under the tape and no damage to the screen !
Forewarned about the 'collapse onto mirror issue' I fashioned the custom screen catcher.
Had a few issues with adhesive left behind on the screen but it pulled off cleanly with sticky tape dabbing.
Couldn't get the wee tray shut with the shim in so left it out .
Results ?
Well I am just so happy with the results. have the SMC M 50/1.4 @ 1.4 onboard and she is achieving focus every time. In dim light inside, the split collar shift is a piece of cake to spot .
Well worth the effort and $ saved
cheers
Pete
K-1 K-01 Q-7
some len
Close to the Edge
Down by the River
some len
Close to the Edge
Down by the River
Posted 30/06/2009 - 11:16
Link
I'm not sure if I am waffling here but wouldn't it be important to have the split screen (centre part of the focus screen) dead centre in the view finder : for it to work properly. If you have ground away one edge it would be off centre.
As I said, i'm not sure if it matters but thought I would ask the question.
As I said, i'm not sure if it matters but thought I would ask the question.
Camera:|K-7|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|
Posted 30/06/2009 - 11:24
Link
impotentspider wrote:
I cant believe you used a BELT SANDER
hehe i have a very light touch
I cant believe you used a BELT SANDER
K-1 K-01 Q-7
some len
Close to the Edge
Down by the River
some len
Close to the Edge
Down by the River
Posted 30/06/2009 - 11:25
Link
Clarky wrote:
I'm not sure if I am waffling here but wouldn't it be important to have the split screen (centre part of the focus screen) dead centre in the view finder : for it to work properly. If you have ground away one edge it would be off centre.
As I said, i'm not sure if it matters but thought I would ask the question.
Yes you are correct.I took the same amount off opposite sides so the circle is in the center.
I'm not sure if I am waffling here but wouldn't it be important to have the split screen (centre part of the focus screen) dead centre in the view finder : for it to work properly. If you have ground away one edge it would be off centre.
As I said, i'm not sure if it matters but thought I would ask the question.
K-1 K-01 Q-7
some len
Close to the Edge
Down by the River
some len
Close to the Edge
Down by the River
Posted 30/06/2009 - 11:57
Link
Awesome job, Pete.
It looks as if you didn't turn the split-prism by 45 degrees. I think I'd like that. Makes the grinding more interesting as well.
It looks as if you didn't turn the split-prism by 45 degrees. I think I'd like that. Makes the grinding more interesting as well.
Posted 30/06/2009 - 12:59
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I always use my 1" X 30" belt sander to make new screens. Frosted scotch tape is a breeze to draw pencil lines on.
http://greyhoundman.blogspot.com/2006_10_01_archive.html
Very good DIY, Transit.
http://greyhoundman.blogspot.com/2006_10_01_archive.html
Very good DIY, Transit.
Posted 30/06/2009 - 13:02
Link
I wonder, How is your light meter behaving with this screen and using NON A lenses.
Any compensation needed, or is exposure spot on ?
Martin.
Any compensation needed, or is exposure spot on ?
Martin.
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600 posts
19 years
Whanganui New Zealand
I am about to cut down a Pentax MG focusing screen to fit my K100D.
I could whip out its screen and check with calipers but trying to minimize handling it
has anyone got the K100D screen dimensions please ?
cheers
Pete
some len
Close to the Edge
Down by the River