MaticKos Photography
15Apr/140

MF103

Maša // monochrome //

masa-duet2-small-v2

 

8Apr/140

TR102

Taja // figure //

taja-mix1-small-v3

 

3Apr/140

ML102

Martina // black //

martina-mix3-small-v2

 

23Mar/140

SS101

Špela // color & BW //

Spela_D8H4842-small

 

Spela_D8H4842-small-v3

15Mar/140

Speedlight light spread in umbrella test // Flash razprsitev v dezniku

I finally had some time and did some sample images of speedlight diffusion inside a white umbrella with different settings. I never did any testing like this before, I knew from experience what different settings bring you, but it's still interested to see how light behaves with different modifiers. I was mostly interested in the way light spills inside the umbrella, what makes the most even spread. Stofen (or any other brand) dome and internal flash diffuser are quite similar, but I'd say internal flash diffuser is better.

So, nothing to scientific, Nikon SB800 on a stand, manual mode at 1/16 power with a 100cm Elinchrom white umbrella. Nikon D800 in manual mode, ISO200, f16. Triggering was done by PocketWizards Flex units.

First set was done shooting into an umbrella, second from the opposite side, outside of the umbrella.
Sequence was:

1.) SB800, 1/16, no aditional modifier - 24mm
2.) SB800, 1/16, stofen diffuser or dome - 14mm
3.) SB800, 1/16, internal flash diffuser was pulled out - 17mm
4.) SB800, 1/16, internal flash diffuser was pulled out + stofen dome on top - 14mm

After the sample shots, I measured the light output using a Polaris light meter set at ISO800.
The results were:

1.) f5
2.) f4.5
3.) f4.5
4.) ???*

For the #4 sequence, light meter was unable to measure light at one meter. At around 70cm it gave a reading of f4, then was unable to read anything lower then that. I found that very strange and still don't know the reason why the meter couldn't read f2.8, f2, f1.4,... etc.. I tried with a new battery but it didn't help. Tried the same measurement with #3 setup and it gave a normal readings down to f0.5 with more distance used. So, no reading for #4 sadly, but it's clear from the sample shots that the light was very weak, 2-3 stops loss at least.

umbrellatest
Končno sem imel nekaj časa in naredil nekaj vzorčnih fotografij kako se svetloba razprši znotraj oz z uporabo dežnika. Kako se svetloba razprši sem vedel po izkušnjah, vseeno pa je zanimivo dejansko videti kaj povzroči različni modifikator in različni milimetri. Po pregledu fotk lahko vidimo, da stofen in interni difuzer naredita zelo podobno razpršitev, a vseeno je interni difuzer malenkost boljši.

Nič posebaj tehničnega, Nikon SB800 na stojalu, ročni (manual) način z 1/16 moči, 100cm velik Elinchrom bel dežnik. Nikon D800 v ročnem načinu, ISO200, f16. Proženo z Pocket Wizards Flex enotami.

Prvi komplet je bil fotkan v dežnik, drugi pa z nasprotne strani, zunanja stran dežnika.
Vrstni red je bil sledeč:

1.) SB800, 1/16, brez dodatnega modifikatorja - 24mm
2.) SB800, 1/16, stofen difuzer - 14mm
3.) SB800, 1/16, uporabljen je bil interni difuzer - 17mm
4.) SB800, 1/16, uporabljen je bil interni difuzer + stofen difuzer - 14mm

Po izdelavi fotk sem zmeril še izgubo svetlobe z Polaris svetlomerom pri ISO800.
Rezultati so bili:

1.) f5
2.) f4.5
3.) f4.5
4.) ???*

*Pri zadnji meritvi svetlomer nikakor ni želel izmeriti svetlobe. Pri cca 70cm razdalje je podal vrednost f4, nato pod to ni šel, tudi pri par cm dodatne razdalje. Zakaj ni podal vrednosti f2.8, f2, f1.4,.. itd si ne znam razložiti. Tudi z novimi baterijami v svetlomeru napaka ostaja. Podobno meritev je pri postavitvi št. 3 normalno opravil, vse do f0.5 pri večji razdalji merjenja. Tako žal za postavitev št. 4 nimam vrednosti, vseeno pa je že po fotkah videno, da je izguba svetlobe občutna, vsaj 2-3 zaslonke.

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