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  #1  
Old 20th November 2016, 09:37 PM
robinb robinb is offline
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Default tilting lens and baseboard

hi all

i saw a picture recently of a bessler enlarger with an easel at about 45degrees and the lens tilted as well
my devere has lens tilt but i have never used it

i am confused as to how this would actually work
i understand that it is basically the same as a view camera
but focus and exposure would be massively exaggerated
one side of the print would be totally out of focus and would get many stops more light

has anybody done any of this kind of work ?

what am i missing

best

robin
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  #2  
Old 20th November 2016, 10:41 PM
alexmuir alexmuir is online now
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Default tilting lens and baseboard

You can use it to correct converging vertical in a print. You should try it. Focus isn't as much of a problem as you might think. I usually just tilt the easel.
Alex


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  #3  
Old 20th November 2016, 11:14 PM
Mike O'Pray Mike O'Pray is offline
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It has limited use and effectively no use if you have a perspective correcting(PC) lens on the camera but if shot with converging verticals because a PC lens wasn't used then this is the way to go

Tim Rudman in his The Photographer's Master Printing Course has a very good and practical section on this

The tilt and enlarger lens angle changes are based on the Scheimpflug principle.

Google Scheimpflug. There are quite a few references to it. I need to say I haven't tried it yet but as Alex has said it isn't as much of a problem as you think. I think one of the pieces of advice was to use f16 on the enlarger lens for extra DoF

Mike
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Old 21st November 2016, 12:09 AM
Lostlabours Lostlabours is offline
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A very useful technique that I've used for years mainly with MF and 35mm negatives.

With my Durst enlargers I tilt the head and then adjust the lens board tilt to keep a sharp plane of focus, the difference in exposure is very slight not something I've really notices.

There's no exaggeration just nice and simple correction of converging verticals etc. Of course I do this in camera when I shoot LF formats.

Ian
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  #5  
Old 21st November 2016, 10:30 AM
alexmuir alexmuir is online now
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You should set up a negative which has converging verticals, then try lifting the easel to see the effect on the image. Lifting the easel alone corrects the verticals, but creates a keystone shaped image which means you lose a portion of the image at each side. Tilting the head, I believe, corrects this. It's a useful technique that can improve certain images.
Alex


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  #6  
Old 21st November 2016, 03:28 PM
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photomi7ch photomi7ch is offline
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This is an out line of the rule for tilting the easel.

http://photomi7ch.blogspot.co.uk/201...lugs-rule.html
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  #7  
Old 21st November 2016, 06:00 PM
Tony Marlow Tony Marlow is offline
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I have tried this but find it difficult to get the right amount of tilt for all three elements. I usually end up threshing about in the dark wondering what elements I should be adjusting. From what has been said above would this be the sequence to set it up?

1) First tilt the easel to get the verticals vertical

2) Tlit the head to get rid of the keystone shape.

3) Finally tilt the lens board to get it all in focus.

Tony
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  #8  
Old 21st November 2016, 07:06 PM
Lostlabours Lostlabours is offline
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Quote:
Originally Posted by Tony Marlow View Post
I have tried this but find it difficult to get the right amount of tilt for all three elements. I usually end up threshing about in the dark wondering what elements I should be adjusting. From what has been said above would this be the sequence to set it up?

1) First tilt the easel to get the verticals vertical

2) Tlit the head to get rid of the keystone shape.

3) Finally tilt the lens board to get it all in focus.

Tony
You don't tilt the easel as well as the head.

You just tilt the head then tilts the lens board. to get teh plane of focus.

Ian
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  #9  
Old 23rd November 2016, 07:17 AM
Tony Marlow Tony Marlow is offline
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Quote:
Originally Posted by Lostlabours View Post
You don't tilt the easel as well as the head.

You just tilt the head then tilts the lens board. to get teh plane of focus.

Ian
Thanks Ian, I will try this. It must be easier adjusting just two elements,

Tony
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