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Telecentric Lenses
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PostPosted: Fri Nov 16, 2012 11:28 pm    Post subject: Reply with quote
Yeah Mark, that's how I interpreted the video as well. Love this bit
Quote:
This (telecentric on the object side) is more natural and provides more pleasing image for storytelling. When you rack the focus from one person to the next, they won't change size.


Idea Laughing Brilliant! Just a small issue that you need a lens the size of the room for this to work.


PostPosted: Sat Nov 17, 2012 12:00 am    Post subject: Reply with quote
Cheers Mark Smile


I thought I was going insane trying to understand this, quite ridiculous for a Cinema Training company!


Thats why I wanted to see images other of bolts and rivets, I was thinking images without perspective like crazy Escher or something.


PostPosted: Wed Nov 21, 2012 11:16 am    Post subject: Reply with quote
SXR_Mark wrote:
...So why does the video have those two slides? My bet is that it was but together by marketing people who:
    heard the lenses were telecentric
    looked up what that meant in the Schneider catalogue
    found information in the section on machine vision lenses
    thought the same benefits must apply to these lenses.
    didn't realise the lens was only image-side telecentric

...


I suppose this is the way it was.
These Wikipedia citation looks very much like they have no clue what they are talking about.
Could not view the hole video, but I suppose these are not Schneider Kreuznach people?

I made a object space telecentricity adapter for Canon EF mount lenses.
With that I could make a more or less telecentric lenses out of my normal lenses.

But I admid I have at the moment no good object to show some nice photography examples.
For macro/microphotography it could be interesting for stacking.

In machine vision telecentric lenses have a diameter up to 300 mm and bigger. Some build with Fresnel lenses .


PostPosted: Wed Nov 21, 2012 10:22 pm    Post subject: Reply with quote
Today I finished my site regarding my homemade telecentric lens.

I think in telecentric photographed images sometimes the human eye is a bit confused: Straight lines that obviously are goning into the distance, but keeping parallel. This is not normal for human vision. Because of this it looks like the structures are spreading to the far end.
Suppose this is not good to understand.

This is the focussing grip of the 180mmf/2.8 AI-S ED Nikkor.



But on the other hand I think it looks a bit like large format studio photography (with long focal length).
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