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  Photography Forum: Large Format Photography Forum: 
  Q. Why different lenses?
Daniel Guerin
Asked by Daniel Guerin    (K=7961) on 3/5/2005 
I'm just beginning to look into large format. I consider myself quite proficient in 35mm but large format appeals to and is a whole new kettle of ball games!

I was wondering, if a field camera has bellows, then why are there different focal length lenses available? I figured the bellows provided the 'zoom'.

Please excuse my ignorance, I'm sure it's the first question of many from me!

Thanks for reading.


    



 Peter Witkop   (K=3189) - Comment Date 3/5/2005
There are no zooms in large format, the bellows are for focusing. My advice to most people considering getting into large format is to get a bood book and do some reading since it's such a differant animal in a number of ways than smaller cameras. On the web http://largeformatphotography.info/ is an excelant source of of information, and the forum there is very knowlegable. Good luck with largeformat!

Peter





 Rudy H   (K=136) - Comment Date 3/25/2006
If you had a single focal length lens for your 35 mm camera and it was attached with a bellow changing the position of the lens will only change the focus point but the field of view will be the same.

The bellows is used to focus. Different focal length lenses focused on the same spot will have different extentions of the bellows. The longer the lens the longer the bellows extention.




Clay Turtle
 Clay Turtle   (K=-42) - Comment Date 4/25/2006
If you shot 35mm then you probably have a zoom lense or at least have looked into them? Why as stated is the different perspective . . . a large negative provides a larger surface area & therefore greater separation and/or graduation in colour or density(b&w). A longer lens reaches out (compresses distance) to magnify a distant object, the actions or perspectus of a normal len is the same (approx.) with 35mm or a 4x5, note only the view is normal not the focal lenght of the len.




Derk Jager
 Derk Jager   (K=865) - Comment Date 6/17/2007
The bellows is for focusing. A short lens creates an large apparent distance between between foreground and background while a long lens creates a short apparent distance between foreground and background. Try with your 35mm zoom. Focus on something in the foreground while zoomed out and then zoom in while keeping your object in the foreground the same size. Pretty cool!
Derk




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