You neglected to post some of the addendums that followed this message <vbg>. 
The shutter bounce vibration in the 6x7 is largely myth. Ask Bill about his 
standing nickel test. Furthermore, the 645 has a film curl problem due to the 
way it winds. In the 6x7 film curl is much less of a problem. And of course the 
negative is MUCH bigger!
Paul
The brotherhood


> The 645 is reputed to be the toughest, most reliable camera ever made by
> Pentax. I know I've put mine through its paces in the abuse handling
> department :) I have the original one, which is manual focus, and I find
> it a joy to use. I shoot B&W almost exclusively with it; I'll never go
> back to printing from those tiny 35mm B&W negs again!
> 
> Some time ago I compiled a list of points offered by various PDML
> members comparing the 645 and the 67:
> 
> 645n/645nII advantages:
> * Smaller and lighter (especially with a full kit of lenses and
>   *especially* when a tripod is included - the 67 needs a *heavy* one)
> * No need for mirror lock-up (with lenses 300mm and less)
> * No issue with shutter-bounce blurring of images.
> * Autofocus
> * More shots on a roll of film
> * Better selection of lenses (especially when you consider that you
> can use all the lenses for the 67 on the 645 with an adaptor) and *much*
> better selection of zoom lenses (most of which offer *superb*
> performance)
> * Data imprinting on film (outside frames)
> * Motorized film advance
> * Multi-segment (matrix) metering (reputed to be truly excellent in its
> 645 implementation)
> * Faster flash sync speed (1/60 vs 1/30)
> * Extra (side-mounted) tripod socket for easy verticals
> 
> With the original manual focus) 645, all these advantages except the
> autofocus and matrix metering apply.
> 
> 67 advantages:
> * Bigger negative
> * Removable pentaprism for waist-level viewing
> * Has one lens for which there's no real 645 equivalent: the 35mm
> fisheye (you'd lose some of the coverage and fisheye effect if you put
> this lens on the 645 with the adapter)
> * Frightens small children & intimidates other photographers
> 
> The major advantage of the 67 is the bigger negative. For many people
> that's the bottom line. That said, the difference between a 35mm neg and
> a 645 neg is huge (in the resulting print). The difference between 
> 645 and 67 is not nearly as great.
> 
> http://luminous-landscape.com/reviews/cameras/pentax67ii.shtml
> http://luminous-landscape.com/reviews/cameras/645nii.shtml
> http://luminous-landscape.com/reviews/cameras/645-mlu.shtml
> 
> -- 
> Mark Roberts
> Photography and writing
> www.robertstech.com
> 

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