Longer exposure times (shutter speed)

[snivlem]

Is it possible to obtain longer exposure times that 1 second with the shutter speed?

I understand that 30 will give you 1/30 of a second in camera terms?

What about 6 second exposures, what value in V-Ray can I do for that?

[MathTheRender]

i tried this once to.

i guess 6 sec. then would be 0.167
and two sec. 0.2, and so on....

[snivlem]

Ah, okay. You can all laugh at me now...But what is the formula for calculating those values?

I'm getting quite confused once the shutter speed goes from fractions of a second (1/125, 1/60, 1/30 etc.. etc..) and into anything longer that requires the shutter to open for more than a second.

[Neilg]

But what is the formula for calculating those values?

1 second is 1.
2 seconds is .5
10 seconds is .1 etc

(divide 1 by the number of seconds)

[snivlem]

1 second is 1.
2 seconds is .5
10 seconds is .1 etc

(divide 1 by the number of seconds)

Beautiful! Thank you so much cubiclegangster. Now it all fits into place!



(Thanks too for your reply before MathTheRender)

[dlparisi]

Also since the number in the shutter speed spinner is actually the inverse of the actual shutter speed (s^-1 or 1/s) you can position the cursor in the spinner and press ctrl-n to open the number expression dialog box and then just type in "1" divided by the number of seconds you want the exposure to be, e.g., for a 15 second exposure you'd enter "1/15" into the dialog which then gets interpreted as 1/(1/15) = 1/.067 = 15 seconds.

[dellis]

Hmmm...i guess you have to use the numeric calculator. Looks like the Vrayphyscam only allows you to type in numbers....else you could have just typed in 1/15 directly into the spinner and hit enter to get the .067. Oh well!

[snivlem]

Thanks, however it wouldn't work anyway as I'm using Maya and it's not smart enough to use *any* calculations in the spinner. Nevermind though you guys answered the question so it's all good!

Cheers.