The Quark prism includes a diffuser filter. I like the prism with the diffuser very much and use it a lot around the house and for reading. The headband which comes with the prism is a piece of junk. The loops are so tight that it is a PITA to fix a Quark to them.
I have the Fenix camping lampshade as well and it fits the Quark heads very nicely. So I assume that all accessories for the Fenix LD20 should fit the Quarks as well, including diffusors. Correct me if I'm wrong.
Last edited by Lucciola; 01-29-2011 at 09:30 AM.
Reason: Added further comment
I have the Fenix Camping Diffuser on my Q123 as well but it's meant to tail stand and act as a lamp. If you want a diffuser that keeps the light going straight out the front as apposed to the Fenix Diffuser then you should look for another option. Fenix also has a white diffuser tip that essentially fits the same lights as the Camping diffuser. Looks like it might fit a Quark and 4Sevens sells it. I agree with defloyd that 4Sevens should come out with their own design. I bet it would rock like their lights.
The cheapest way to add a diffuser to a Quark is by putting a plastic pill bottle on the bezel, like so:
I tried it today, very good, besides, I take apart the quark head when I twisted to stuff the head into the bottle neck with turbo on. Guess the heat and twist really worked. I am so happy that I can take it apart as I can change emitter or work on something else.
The Fenix AD101 diffuser cone tip for the small PD30 size lights fit the Quark with a slight modification. A file and 5 minutes of filing will make it fit. The Quark is slightly larger in diameter than the Fenix.
It's just a business card. On one half is piece of aluminum foil tape for reflector duty. On the back is a piece of clear packing tape to give it more integrity and to hold two twisty ties to it - they allow you set the angle better.
I believe I use this from Fenix. It fits very nicely into the groove on standard Quarks at the head and can flip away nicely if diffusion is not required. Not optimal, being plastic, but it sure beats other market solutions I've seen and does work well for me FWIW. Hope this helps.