Hello Mr. Surapon,
Does the Neewer Flash come with a Diffuser? Do you see the individual LEDs or a Circle of light in your photos. Can you increase the intensity of the light or is it just one setting. I know I cant expect more for $35 macro flash but just curious.
No, This Cheap LED Ring Light( 2 Years ago-Old Technology) is can not Dim, and Do not have the Separated Diffuser ( It come with Build in Diffu.), BUT, We can turn on the whole ring light, or Just Left Side, or Right Side = Great for created Shade and shadow for Subject , which created 3D. Effected of the Photos.
" - 6 x Adapter Rings Included! (49mm/52mm/55mm/58mm/62mm/67mm)
-=Specially designed ring shape is perfect for MACRO photography (close-up).
-This light has a double-duty power supply design which allows you to use 2 x AA batteries or DC power
- This lighting unit provide a continuous lighting (not flashing), the continuous lighting allows you handle exposure easily.
-Also great for portrait photography."
Suraponhttp://www.amazon.com/NEEWER%C2%AE-Macro-Ring-LED-Light/dp/B0031AQ302?tag=crf-20BUT for $ 40 US Dollars, You can get the Newer Version 25% more Light and CAN DIM/ Adjust the Intensity of Light too.http://www.amazon.com/Macro-Photography-Adapter-Pentax-Tamron/dp/B007OLC8MG