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02-17-2016, 09:34 AM   #16
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Join Date: Feb 2016
Posts: 27
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so far I figured out I get motion blur in mixed light with 1/125s.
If I shoot in available light, 1/125s is to slow for a portrait with 150mm. 1/400 would be better and save at 1/640s. I dont know if I shake or if it's the models, or both.
Slower speeds are just a bit to much random in sharpness, even on tripod.
Now the next problem, I found the pentax lenses get better when I stop down even beyond f8. So for now I end up turning up the iso like 3200 or 6400, or using flash to overpower ambient light significantly.

I have 35HD(great at any aperture), 55mm(can't tell to much yet, kind of inconsistent, to many factors for conclusions), 75mm(needs at least f8), 150mm(starts to get good at f8 and beyond, needs high shutters).
The 90mm would be an option, but price and weight let me doubt, if it's worth to get it.

I also wonder currently, if a continous light solution with fresnels would make sense for this system. It would certainly create more mood. They do not have the amount of light though to shoot at f8/ 1/640 and ISO400 though I need to measure this.

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