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The guide number is a numerical way of expressing the intensity of light emitted by a strobe. The guide number formula is: Guide Number equals Aperture times Distance. To determine the guide number of a strobe top side (Air), place an object or target at a distance of 10' from the strobe...

i have used my pair ds 125 strobes at half power hundreds of times (literally!) for studio product photography shooting. just take your time in between strobe firings......... hth, b

some of the guide number specs you listed were measured in meters, others in feet, some above water..........and others below........... the Strobefinder attempts to make comparing strobe data easier.........one way by listing all manufacturer supplied data, including topside guide numbers...

For your own safety, the safety of your dive buddy, and the safety of the reef, please don't take any camera underwater until your diving skills have improved.

An opaque flash blocker placed in front of the onboard flash of a point and shoot digital camera may "control backscatter". But as far as I know translucent diffusers for strobes are not meant or designed to "control backscatter". Diffusers soften light emitted by the strobe. Diffusers also...

Jerry, Thanks for reminding me about the Ikelite AF-35. I don't think that most users add a second strobe to increase light intensity. The second strobe is used more to either increase the area of coverage (say for wide angle work) or to knock down harsh shadows (say in macro work). It's...

I would choose an aperture around two stops down from wide open. I believe the implication here is that you must choose the smallest aperture. I believe (from what I read) when using small sensor point and shoot (automatic?) cameras, depth of field is more difficult to avoid than capture...

you may wish contact HeinrichsWeikamp to confirm if their Digital Adapter might be compatible with your particular Olympus Camera: HeinrichsWeikamp GbR I believe Reef Photo in Florida carries HW products in the States and would also have the answer for you: Reef Photo & Video!, The Underwater...

Try contacting Stephen Frink at Seacam USA: frinkphoto@aol.com and ask him if any seacam seaflash strobes (250?) provide ittl......... Underwater Housings and Camera Housings for Underwater Photography, Seacam Film and Digital Housings: Seacam Seaflash 250 hth, b

mind if i put that to music? ;)

High powered underwater strobes rely on water to help dissipate heat. 2 "AA" battery design strobes such as the Sunpak G-Flash (discontinued) were less prone to damage with topside use due to their inherent time delay (7-9 sec) which was required to recharge its capacitor (vs 4 AA battery...

If your goal is to compare features, you can find most every underwater strobe listed in the StrobeFinder: Underwater Strobe Comparison Guide - Digital Diver Network Terms like Lux and Lumens will not be listed among the categories, but Guide Numbers, Watt seconds, and Coverage (aka Angle of...

I forgot to add that the red focus light can also mean the difference between capturing an image of an octopus at night with its eyes open as opposed to using a traditional white focus light......and capturing the same subject with it's eyes shut (wouldn't we all close our eyes if someone was...

I cut to size with scissors a piece of Roscolux filter #25 and placed it between the reflector and the lens of a mini Q 40.......turning it into a red focus light......... Rosco US : Filters : Roscolux

The above statement reflects INON's Advance Cancel Circuitry (D-2000, Z-240). http://www.inonamerica.com/content/docs/AdvCancelCircuit2F375.pdf INON strobes (D-2000, Z-240) also offer S-TTL, which relies on mimicking a pre-flash. http://www.inonamerica.com/content/docs/STTL_D2000.pdf

My advise is to give Reef Photo a call. They are experts! .pdf manual: http://www.heinrichsweikamp.net/blitz/common/da-o-x_en.pdf home page: HeinrichsWeikamp GbR

Ikelite is known for posting reputable information, including guide numbers and angles of coverage. Ikelite lists the Guide number for the AF 35, sensitivity set to ISO 100, measured in feet, at GN 28 surface, and more importantly, GN 16 underwater. Metric equivalents at ISO 100 would...

Herman, Outstanding posts!!!!! I would like to add that the f/stop chosen will influence depth of field. The larger the diameter of the aperture measures (f/stop such as f/2.8), the less depth of field captured in the image. The smaller the diameter of the aperture (f/stop such as...

Agree! In the flash menu system of the Oly c5050 you are able to program a sync signal (10 power levels I recall!) to trigger an external strobe.......... As I mentioned I wonder if a sync signal (no preflash) option is also available in the A570IS flash menu system as well. When I was...

An "old film strobe" strobe with an attached sync cord might possibly be compatible with the A570 IS if you were also incorporating the use of a HeinrichsWeikamp DA adapter (btw, according to the HW web site, the A570 IS is not "officially" supported yet........doesn't mean it won't...