6 f-stops is already quite a darkening. I suppose the filter when I want with wide-open aperture, ie shallow depth of field, shoot in bright sunlight. Camera is the Lumix GH3 with 12-35mm lens 2.8. Also for special effects is a filter used. If it is not necessary, but you should stay with filters, bring the 2-3 f-stops. Particularly at such a high filtering it is important to have excellent quality filter glass. Graufilter cause namely a very light tint that one must correct troublesome again with the software. This is not like that. The filter itself is mechanically very well made and can be spun on and off properly. That's with cheap filters usually not so true. Disconnect easily.
