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herbko

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Everything posted by herbko

  1. Hey Laz, Great job on the exposure of the ray and white sand. I find it hard to keep from over exposing the white sand on shots like that. Herb
  2. Ain't no way I can compete with the shots just posted by James Watt, but here's a few shots I got this weekend at Monterey, CA. A few more can be found at http://fototime.com/inv/689EA774D23BF2F Herb [Edited on 4-9-2002 by herbko]
  3. Finally got to dive with my new lighting setup. Two YS90DX both on slave mode synced to the built-in flash filtered with a piece of unexposed slide. Strobes were set to the "Pre" and slave mode. It worked ! I had tested it all indoors and it had all worked, but when I tried it at the parking lot just before the dive, it didn't trigger! I was a little concerned. I thought about it a moment and realized the bright sun light probably saturated the strobe sensors. Tried it again in a dark area in my car and the strobes triggered. Jumped in, and eveything works. Even the shots at 10' depth triggered. I'll post some shot when I have the time to upload. Herb
  4. Nice shots! I'm amazed that you did all that without an external strobe. Did you adjust the color balance with a photo editor? Herb
  5. Great Idea. I spent an hour or so trying it out last night. I've posted my results in a reply to another discussion http://www.wetpixel.com/forum/viewthread.php?tid=145 This is better than reflecting the light up since the sensor on the YS90DX faces the front of the strobe. This should be more reliable. Now that I thought a little about it. The pre-flash could be an advantage in this scheme, it keeps your strobe from being set off by other photographers near by. Does anyone know how long is the "memory" of the YS90DX? That is how much time can elapse between the two flash and still have the strobe triggered. Maybe I'll try some tests this weekend. Now if only the weather would cooperate so I can try this out on a dive. Herb
  6. Definitely get a strobe instead of a continous light. The strobe will be brighter and allows you much more freedom in setting the exposure of the background. I just did some experiments per rstark's suggestion of using unexposed slide film to filter out visible light and let the IR trigger the slaves using a C3000 and a YS90DX strobe. I think rstark's right about the slide letting the IR through, but he's wrong about the pre-flash not having any IR. I got the strobe to trigger without using a fiber on the strobe's "Pre" mode. If I set it to the normal "On" mode the stobe always triggered on the pre-flash and my photo alway turned out black. It makes sense when you think about it. Both the pre-flash and the main flash comes from the same filament. I think the only difference is the duration the filament gets turned on. I did the first set of tests by taping a piece of unexposed slide film right on the camera's flash. For the second set, I removed that film and covered the inside front surface of the housing with unexposed slide film. Same results. It worked very well. The only way I got this to fail is by going outside and just shooting up at a dark empty sky. The YS90DX didn't trigger in this case. Also not surprising since the light sensor is on the front of the strobe. No reflected light, no trigger. I think it's probably good to have the strobe not trigger when the subject is too far to reflect much light; it wouldn't help light the subject, only create backscatter. Herb
  7. I've also been thinking about upgrading, and I'm leaning towards the G2. The biggest advantage of the G2 is the raw output mode. If you do any post processing it's best to start with the raw image without having the camera do a white balance beforehand. The jpeg or tiff output is 8 bits/color, and the CCD is better than that which means the dyanmic range is better in the raw output mode. Tests by Phil Askey show better than 9 bits dynamic range from the CCD of a G1. Hopefully the G2 can do as well. See http://www.dpreview.com/news/0011/00111608...icrange_raw.asp An extra bit of dynamic range is very significant. It'll give you better details in shots with very bright and very dark regions. With 9 bits of dynamic range you can compensate for being a full stop underexposed and produce a full range 8 bit output. I do agree that the coolpix 5000 is better at macro,and its zoom range is better for UW photos, but these are things you can fix with add-on lenses. Herb [Edited on 3-12-2002 by herbko]
  8. I came across this web page by Cathy Church which may shed light on the subject. Have a look at her comments on the YS90DX strobe. http://www.cathychurch.com/latestdv.html Herb
  9. Foveon announced their X3 sensor to be used in a new Sigma digital SLR. The new sensor captures all three colors in each pixel. This could lead to a big improvement in image quality. See the write up at http://www.dpreview.com Herb
  10. It's tricky to sync the strobe with an Olympus. You have to get the right size fiber so that the preflash does not trigger the strobe, but the second flash will. I used an 1mm fiber from http://www.web-tronics.com Herb [Edited on 2-8-2002 by herbko]
  11. This is probably the oldest one in service. I put this together January 2001, before pre-flash compatible strobes were available. Had to make my own optical fiber link to the Ikelite A35 strobe. Here are a few links to some of the photos from this setup. http://www.fototime.com/inv/158D2454F417E68 http://www.fototime.com/inv/624CB152B588FDE http://www.fototime.com/inv/EA093E2DE3D277C Herb [Edited on 2-8-2002 by herbko]
  12. herbko

    message edit

    Just noticed another interesting "feature" in this message board software. I did not specify a location in my profile, and the software puts in the location of the last entry for my location. Herb
  13. herbko

    message edit

    Thanks. It worked. The first time I clicked the "Preview Post" button after making the changes and was never able to recover. Herb
  14. herbko

    message edit

    I tried to edit my message after it was posted to clean up a sentence, but I couldn't get the original message replace with the new one. The two buttons, "Edit Post" and "Preview Post" doesn't do the trick. What am I missing? Herb
  15. Nice shots Don. What output file format did you use? I've been thinking about replacing my C3000 with a G2. To me, the biggest advantage the G2 has over a C4040 is the Canon Raw output mode. For color post processing, it should be better to start with the raw output and not have the camera do a "white balance" before you get the bits. It may also have better dynamic range than the 8 bits/color tiff or jpeg output. Although with the small CCD, the signal-to-noise is lots worst than the 12 bits in the raw output. Has anybody seen dynamic range tests for this camera? Herb [Edited on 1-23-2002 by herbko]
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