A Photography forum. PhotoBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » PhotoBanter.com forum » Photo Equipment » Large Format Photography Equipment
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Oddity with Protar VII



 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old October 16th 11, 06:48 PM posted to rec.photo.equipment.large-format
Richard Knoppow
external usenet poster
 
Posts: 751
Default Oddity with Protar VII


"Cheesehead" wrote in message
...
I was looking @ the rear cell on my B&L lens, and it's 23
1/4" f/l.
The front cell is 18 7/8" f/l.
The old B&L table never put a longer cell in the rear.
http://www.cameraeccentric.com/html/...schlomb_3.html
I got the camera from the original family owner, and it
was apparently
ordered this way in 1923.
Makes me wonder ... any thoughts on this anomaly?

Either cell will fit on either end, somone just reversed
them from normal. The correction is slightly better when the
longer lens is in front. When the single cells are used
alone they perform best behind the diaphragm but there is
really little difference in correction. Since the principle
points of the single cells are displaced in the direction of
the curvature the distance from the focal plane is less when
the lenses are mounted on the front of the shutter. This
allows some lenses to be used on bellows which are not long
enough to focus them when on the back of the shutter. The
difference is significantly more than just the mechanical
length although that also counts.
Both cells should have the same threads and both sides
of the shutter should be the same.
Both B&L and Zeiss sold Protars in sets with up to four
cells of different focal lengths which could be combined or
used alone. The most elaborate B&L set also came with an
extra-wide-angle Protar.


--
Richard Knoppow
Los Angeles, CA, USA



 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Just developed negs from the Protar VII last night Richard Knoppow Large Format Photography Equipment 0 February 10th 11 05:59 AM
Protar VII filter size Richard Knoppow Large Format Photography Equipment 0 February 5th 11 09:24 PM
Here's an oddity robax Large Format Photography Equipment 0 March 5th 05 02:50 PM
Zeiss Protar [email protected] Large Format Photography Equipment 2 October 8th 04 09:51 PM
B&L Protar sets Alan Davenport Large Format Photography Equipment 1 January 29th 04 02:57 PM


All times are GMT +1. The time now is 07:53 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 PhotoBanter.com.
The comments are property of their posters.