Pacislander 0 Posted October 12, 2007 I haven't had a chance to get out and use my new set up yet, and i figured I would play around with it and figure it out myself, but why not try and get some help on here first. Im going to be shooting two sea and sea YS-250's with an Ike housing, so ill be shooting manual flash. There is a table and equation that came along with my strobes to help me figute out proper exposure, but it doesnt make a whole lot of sense to me at first glance. Anyone have any tips on how to figure out how much flash to use in specific situations? Maybe this will save me the trouble of trial and error, atleast an excessive amount of trial and error. I use TTL for topside when I use flash so manual flash is new to me. Mahalo in advance Share this post Link to post Share on other sites
james 0 Posted October 12, 2007 Use the guide number of your flash. Guide number/distance = Fstop. For example, if the guide number is 30 (feet) and you are shooting 3 feet away, then you use an f-stop of 10 Or you can set your f-stop and then adjust the guide number on the flash. Cheers James Share this post Link to post Share on other sites
Pacislander 0 Posted October 13, 2007 (edited) I think i know this, but this is when the flash is set to full power and ISO 100? And would it make more sense then to just change the f-stop instead of adjusting the amount of light output on the stobes? I can imagine that would be easier, atleast for a beginer. I feel like this should be something I know, but I havent used flash much, and when I do, it's TTL. Thanks for the help. Edited October 13, 2007 by Pacislander Share this post Link to post Share on other sites
markdhanlon 0 Posted October 15, 2007 By changing the f-stop rather than the strobe output will change your DOF, which changes the feel of the photo, and can be extremely critical for a macro shot. As well, changing your ISO will increase/decrease the noise in the photo. Ultimately, adjusting the strobe output allows for the photo that you want. And with digital it's rather easy to look at the histogram to ensure correct exposure. Share this post Link to post Share on other sites
Pacislander 0 Posted October 15, 2007 Yea I understand the affects of changing the f-stop and ISO, Im just wondering how you know how much power to use on the strobes at a given f-stop. I suppose I will have to play with it and check the histogram. I'm sure I will be doing some experiementing at first. Can't wait though. Thanks for the help Share this post Link to post Share on other sites
