[rollei_list] Re: rollei panorama head
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 23 Oct 2007 13:44:19 -0700
----- Original Message -----
From: "Jerry Lehrer" <glehrer@xxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, October 23, 2007 1:18 PM
Subject: [rollei_list] Re: rollei panorama head
Richard,
Rolleigrip? You mean Rolleifix, don't you?
Jerry
I thought that looked wrong when I typed it. Of course,
Rolleifix is right. The older type is the first photo, the
newer one, the one that needs to be used with the
Rollei_fix_ is the second one.
I have one of the older ones and have used it several
times, I don't have the newer kind and have never worked
with one. The old one works very well and presumably the
newer one does too. Generally Rollei accessories are well
designed and do the jobs they are intended for.
Despite the experience of others the edges of Rolleipan
pictures need some help if they are to splice seamlessly.
The nature of lenses designed for single images is such that
objects at the corners are "distorted". This is not a true
distortion but rather is the result of making them appear
correct when the photo is viewed from the correct viewpoint.
This is on-axis and at a distance of either the same as the
lens or the equivalent distance times the amount of
enlargement. If you photograph a group of round objects, say
golf balls, arranged in a grid pattern you will find the
ones at the corners are egg shaped with the narrow ends
pointing toward the center of the picture. A flat grid, like
graph paper, is reproduced as equal sized squares. A little
thought will show that both will appear in the correct
perspective when viewed from the correct distance by one eye
on the optical axis of the print. For a panoram there is no
vanishing point but rather a vanishing line. At the seams of
the print three dimensional objects will be "distorted" as
above with the axis of distortion rotated by 90 degees, as a
result there is a mis-match at the edges and corners. This
can be fixed optically but its difficult. The best results
are had by using an image editor program on a computer which
has a function for doing this specific corrrection. I am
pretty sure there is a plug-in for Photoshop and maybe the
latest version has it built in. I don't know about other
image editors. There is an elaborate freeware image editor
called Gimp which is available on-line but I have no
experience with it.
In any case its still possible to make acceptable
panoramas by just cutting together the prints.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
Rollei List
- Post to rollei_list@xxxxxxxxxxxxx
- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'
in the subject field OR by logging into www.freelists.org
- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with
'unsubscribe' in the subject field OR by logging into www.freelists.org
- Online, searchable archives are available at
//www.freelists.org/archives/rollei_list
Other related posts:
