I am wondering what difference there is, in terms of light quality, between a fresnel attachment (Bron Flooter, Elinchrom S35, Bowens 6000, etc) and Bron Pulso Spot (or whatever fixed fresnel adapted to Broncolor flash tube like Desisti).
Obviously there is difference in flash tube design and positionning of it. A standard pulso head will fit on fresnel attachment, the top of the flash tube is facing the fresnel glass. On a fixed fresnel head the flash tube will be lighting from the side.
From what I read online fixed fresnel will produce harder light and more contollable gradation, is that right? Any comparative experience?