Rollfilm backs can be fussy to use. They are bulkier and heavier than a regular filmholder, so can tug on a weak back due to simple gravity. This smaller format is
also a lot fussier to focus on the GG than 4x5, so things get nitpicky. And not all rollfilm holders did a good job keeping the film plane flat. It just depends on how
precise you need to be. But if you want to simulate true LF results you'll want both camera and holder to be very well made. All I do under such circumstances is
use Horseman rollfilm holders on my Ebony 4x5 folder; but Ebony is a relatively expensive brand. I've seen a lot of Horseman metal technical cameras at very good
prices nowadays, even in good condition. There are beautifully made but a bit restrictive in terms of what focal lengths they'll accept. Baby Technikas are a bit more
versatile (at least the later ones), but can command steep prices. And they won't be any lighter than some decent field 4x5's, which of course can be used with
ordinary 4x5 sheet film holders as well as rollfilm backs.
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