Crop factor for regular 8mm
Posted 31 May 2011 - 08:42 AM
Posted 31 May 2011 - 09:22 AM
Posted 31 May 2011 - 10:38 AM
Posted 31 May 2011 - 10:56 AM
Posted 31 May 2011 - 07:24 PM
Thus, focal lengths for both formats aren't all that dissimilar. The "normal" focal length for Regular 8mm is 12.5mm and for Super 8mm it's 15mm. Although many Regular 8mm camera lenses for normal are 13mm. Remember, the 'normal' standard has more to do with perspective, in maintaining that relative to all gauges. What's really usable for normal, is relative of course. I think most of us prefer a wider angle than what is set as normal focal length. That being said, the basic prime lens builtin to virtually all beam-splitter Super 8mm cameras if you were to remove the front zoom standard is 15mm. And the same goes for those later model Regular 8mm cameras that had zoom lenses, but with a 12.5mm or 13mm prime lens in there. [Normal 8mm, Double 8mm, Standard 8mm etc, with apologies for those outside of the USA since it's common for us to refer to the old bootlace as Regular 8mm].
Anyhow, this gives you a reference starting point, and the other posting stating that Super 8mm was 1.3x larger is on the mark, so I would use that to compute relative focal lengths, to get the same image magnification compared to the Super 8mm counterpart and vice-versa.
Hope my two cents here helps.
Posted 31 May 2011 - 08:46 PM
Edited by Patrick Cooper, 31 May 2011 - 08:51 PM.
Posted 01 June 2011 - 03:29 AM
There were some longer primes made in D mount, or the various other 8mm camera mounts around, by companies like Som Berthiot, Wollensak, Kern, Rodenstock and Kodak (and likely others), usually 50mm (or 2") and 75mm ( 3"), but going as long as 150mm ( 6"). They seem hard to find, though.
Angenieux and Schneider also made longer, interchangeable zooms, such as 8-48 or 6.5-52. The longest zoom I've heard of is an Angenieux 12-120 for the French-made Ercsam Camex.