No, the duty cycle is more variable the larger ratio you get.BFI wrote: ↑22 Sep 2024, 02:32Chief, is 240Hz output required to unlock all 3 options? With 60Hz input, that is.Chief Blur Buster wrote: ↑09 Aug 2023, 00:08You will need to sacrifice 4K60 output to do 1080p240 output or 1440p120 output with a Retrotink. The BFI is adjustable in 25% (4ms), 50% (8ms), 75% (12ms) persistence when outputting 1080p240.
I'm confused because you've said the RT4K's BFI has to output 120Hz for 60Hz input (MitM limitation), which gives me the impression it can't modify those 60 frames, thus increases the refresh to enable insertions. 60/180 = 1:0:0 etc...
But following this logic, 120, 180 and 240Hz would all be locked to their own duty cycles. Where have I gone wrong?!
60fps at 180Hz would have the option of 1:1:0 and 1:0:0 duty cycles
60fps at 240Hz would have the option of 1:1:1:0 and 1:1:0:0 and 1:0:0:0 duty cycles
See TestUFO Variable-Persistence BFI as an example.
The longer the visible frame time (duty cycle), the less flickery. The old Z did subrefresh strobing, so at 2ms you get more motion blur with these levels of monolithic software BFI but you get less flicker with monolithic software BFI. You can't get less motionblur than minimum refreshtime (e.g. 1/240sec for 240Hz) for software BFI, while hardware strobing can go sub-refresh.
But, brute can help, e.g. 480Hz at 1:0:0:0:0:0:0:0 duty cycle would result in 2ms MPRT for 60Hz, which can outperform Z default settings for strobe. More Hz, the more duty cycle flexibility adjustment.