So far (one film completed and one half way through) I have used it handheld. The first roll was shot at 1/100s and f/16. I did have camera shake on one shot, so my second roll I used 1/250s (the fastest on my copy).The Bessa is an impressive camera, I have a (post war) Bessa I with the fantastic Color-Skopar coated lens. These old folders are amazing, I also have a 1937 Zeiss Ikonta 6x9 with a Zeiss Tessar lens, uncoated of course, and that can produce wonderful negatives if used with care, quite amazing considering it is 10 years older than me.
Did you have the camera on a tripod? It is a bit awkward to handhold and needs to be used with the shortest possible shutter speed and smallest aperture possible, I have found.
Still standing by fishyfish_arcade, on Flickr

Pentax 17 Kono Colour by Suzy Richards, on Flickr
Pentax 17 Kono Colour by Suzy Richards, on Flickr
Pentax 17 Kono Colour by Suzy Richards, on Flickr
Pentax 17 Kono Colour by Suzy Richards, on Flickr
Minox CD112 LomoChrome Classicolor by Suzy Richards, on Flickr
Minox CD112 LomoChrome Classicolor by Suzy Richards, on Flickr
Minox CD112 LomoChrome Classicolor by Suzy Richards, on Flickr
