[rollei_list] Re: rollei panorama head
----- 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. 

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Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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