Goldenorfe wrote:
a question John,
have you tried different grades of diffusion for different magnification shots, ie up to life size & 2-5x life?
just started trying single sheet 216 which is looking very good up to life but might need to add another light sheet ,maybe 252 or 481 for higher mag shots
phil
My experience tells me the opposite is true- the higher the mag the lower the diffusion you need - to do with the size of the light source compared to the subject size - could be wrong though
LordV wrote:
My experience tells me the opposite is true- the higher the mag the lower the diffusion you need - to do with the size of the light source compared to the subject size - could be wrong though
Brian v.
Only if the flash is getting closer to the subject Brian -easy for me with the MT-24EX mounted to the end of the MPE-65mm. But I think that Phil is using a DIY ring flash so I think he's running into some flash duration problems -issues that really won't be solved by using stronger diffusion...
hi John, i am using similar to brians diffuser on 430ex, have never managed to shoot in burst mode like you tried, but now with 1 sheet of 216 have already managed to get 3 frames in continious. so i am obviously getting a lot more light through than the kitchen towel allowed with similar results.
i was happy with results from kt but it did block an awfull lot of light.
as you said, purpose made material is always going to be better.
phil
It's good that you're able to shoot a three frame burst -sounds like the flash duration is short. At higher mags are you moving the flash closer to the subject?
How much distance is there between the flash head and the subject -how long is the diffuser? What is the angle between the flash, subject, and sensor?
Imagine that the light coming out of the flash / diffuser is like water under high pressure. Now ask yourself, based on how you have the flash positioned, is the light hitting the subject directly, or is most of it hitting in front or behind? It really sounds to me like the flash is not pointed directly at what you are shooting, that you're only getting a "splash" of light on the subject and as the magnification climbs so does your flash duration. It should go up with the magnification because there is less surface area reflecting light back into the lens, but not so high that you think you need more diffusion...
