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Olympus E-1 E-1 specific discussion.

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  #1  
Old 22nd March 2014
peteraj peteraj is offline
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focal point/plane

Hi, I'm making a tripod bracket to enable me to take
multiple images for panoramas. Is the mark, circle
with a line, on the top right of the prism an indication
of the position of the "film" plane? Also, does the small
indentation behind the tripod mount thread on the bottom
plate indicate the same point?
Thank you.
Peter
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Old 22nd March 2014
Bluegrass Jim Bluegrass Jim is offline
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Re: focal point/plane

Hello Peter,
Looking at my EM-5 through the lens throat it would appear to be on the film plane, there is no mark on the bottom of mine.
Regards Jim.
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Old 22nd March 2014
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Re: focal point/plane

Yes that is the sensor plane indicator. It's not what you see by peering past the lens mount as there is a stack of filters in front of the actual sensor.

Ian
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Old 22nd March 2014
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Re: focal point/plane

The one on top is, I don't remember the indent on the bottom so I'm not sure what that is.
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Old 22nd March 2014
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Re: focal point/plane

At the risk of being patronising, you are aware that that isn't where you pivot for accurate panoramas? Explained here. Apologies if you already knew this.
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Old 22nd March 2014
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Re: focal point/plane

I was assuming the OP had entrance pupil to film/sensor plane distances.
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Old 22nd March 2014
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Re: focal point/plane

Worth pointing out though in case someone without the knowledge reads the thread and wants to try making a mount.
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Old 22nd March 2014
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Lightbulb Re: focal point/plane

The small round indentation, is an anti-rotation hole for tripod mounts that provide a pin. Often they don't line up which is why they are spring loaded or screw down.

Rotating on the film/sensor plane is not always best. Many "pano" heads have adjustments to allow you to rotate about the optical axis of the lens being used. This changes with various focal lengths.

Have fun...
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Old 28th March 2014
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Re: focal point/plane

Thank you for your replies, looks like it's back to the drawing board!
Not patronising at all John, and a very interesting link. After reading
your comments I recalled reading an article, years ago, about the NP
for the 14-54 lens so I began trawling through many thousands of files
from three lap tops on the off chance that I downloaded the information.
I did and this is what I found:

FP NP
14 80
18 74
25 62
35 51
54 35

Unfortunately, no reference to where to measure the NP from. This is
where you may be able to help Graham, any ideas?

Peter
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