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Tom_Kline

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Everything posted by Tom_Kline

  1. MACRO! I have been using the 50mm macro with the RS for almost all my night dives for well over a decade, will use 60mm and 105mm macros with dSLRs. So I voted 'other.' At night one can get lots of creature pix (inverts in particular) so macros are most useful. I use an Ike SS200 with modeling light to focus and as my primary dive light. Tom
  2. I too use the DUI harness with a drysuit and wish it had been invented decades earlier! On a recent trip to B.C. I added 8# (two 4# blocks) to an AL80 tank using an extra cam strap on a Hogarthian rig. Prefer to use steel tanks but they are not always available. With certain dry suits I have used ankle weights but they are not needed with my current rock boot equipped DUI suit. Tom
  3. Any interesting new UW photo equipment at DEMA? Did SEACAM show their new remote control? Tom
  4. Just back from a >1 month-long non-dive trip. Used a P2000 to store my images, which I managed to fill up; brought back remaining shots on 2 4GB CF cards. It worked well, never ran out of battery power. It was convenient to show pix to others but had to make sure they did not touch the buttons - the one on the bottom (facing holder) takes you back to the 'homepage' of the gadget and is easy to touch when holding the P2000. Scrolling for images on the HD of the P2000 is quite a bit slower than doing so on the CF card still in a D70 or D2H. The zoom function only works on jpegs, too bad. Improvements should include faster processor, larger drive, and better interface ergonomics. Hopefully 'Moore's law' will apply to this class of gadget. Tom
  5. Wow!, you have some extraordinary photos here and in the other thread ! I guess I should not complain so much about our slow connections in Alaska, the gravel road of the information superhighway (there are a lot of gravel roads in Alaska). Tom
  6. http://www.mydigitaldiscount.com/s.nl/sc.1/.f Above is the homepage for mydigitaldiscount, check out their Ridata sale prices, 4 GB 80x for 260 if you buy two . Tom
  7. Thanks Mike! Actually the air temp was about 80 °F, I was in a t-shirt. I did get splashed a few times with the cold water, however, as the salmon were rather active, typical spawning activity! The difference between the air and water temperature caused the dome port to fog up rather instantly, like an ice cold drink on a warm day! Tom
  8. Here is another example of fish sex - fisheye (10.5 mm) to fisheye (salmon) ! I just became operational for digital UW today, this being an example from today. Spawning sockeye salmon shot with available light: ISO 640 1/250s at f/11. I used the SEACAM Superdome (SD) port. That is a male in the center. He was chasing the female on the left side of the pic. That is a moribund spawned-out salmon in the background between the other two. Pacific salmon die after spawning. Tom
  9. No bookmarks appeared to be working this morning, but now all seem to be OK including the one for the main page that did not work yesterday. The difference, in main page bookmarks, is one has www and one does not, both now work. Tom
  10. Hi Eric, The main unusual thing I noticed was that the site was down for a while this evening. My bookmarked url for the main page is doa, now gets: This is the Pleskâ„¢ default page etc. instead, so made a new one. However, the old bookmarks for recent topics and the forum still work! Tom
  11. Red-lined the attachment space, here is the other shot. Tom
  12. I was down south in B.C just over a month ago diving in Barkley Sound for some warm-water diving . It is all relative. It was 55 to 61 F, which is not very cold for a dry suit. Not cold at all. I have seen numerous much colder divers in the tropics, mainly due to using wetsuits and loss of direct sunlight (night, cloudy and rainy etc). There were lots of black-eyed gobies, or goby-wons (re. obi-won), as I jokingly refered to them. Here is a pair of shots done with an RS (still on film), Velvia, and a single SS200. Note less DOF but focus on pectoral and dorsal in closer shot, that was as close as I could get to a goby-won with the 50, before they would spook. Tom
  13. ps. forgot to mention that there are formulas for calculating the bellows correction factor, DOF etc. but are not to practical for UW use, one needs to know the total extension (tube plus amount due to lens focusing) and focal length and use a calculator. I recall one even includes pupillary magnification. One would need more input data.
  14. In the good old days of manual focusing most macro lenses (e.g. 55/3.5, 105/4, and 200/4 Micro-Nikkors) only focused to 1:2 (half life size) so special extension tubes were sold to match to the focal lengths so as to yield 1:2 to 1:1 focusing range for some lenses. For example the Nikon PK-13 ring is 27.5mm long and was designed for the 55 whereas the PN-11 was for the 105. These two lenses also focused to 1:2 simply by racking out the lens elements, the extension tube carried this out for another increment equal to that intrinsic to the lens. When the 200 came out, it had internal focus (IF) and no extension tube came out for it. My recollection was the that the TC-300 teleconverter (TC; a.k.a. doubler) was recommended to bring the 200 to 1:1 but the PN-11 could be used too but less than 1:1 resulted. The IF enables lenses to compensate for lens aberrations induced by change in focus distance. This would be lost if an extension tube was used but would be conserved if a TC was used. The bellows correction factor (due to loss of light by the extension) was engraved on the barrel of some MF macro lenses, two scales on some for use with and without the 1:1 tube. With the advent of TTL metering and TTL flash, the bellows correction factor was all but forgotten since the metering system took care of it. Interestingly, the 50 macro lens for the Nikonos RS has an automatic compensation so that as the lens is focused to 1:1, it opens up a tad. Therefore, f/22 remains T/22, (T-stop, not f/stop) but the DOF is that of the compensated aperture, i.e., less DOF. I criticized this 'feature' in my review of the RS that I did for the AAUS a decade or so ago. This is good for some folks, but DOF is sacrificed as a result. The main problem of using an extension or TC UW is that one may have to use special lens gears; unless you have one of those ports that incorporates focusing and have a port extension tube that is the same length as your lens extension tube. Alternatively, you would have to do your dive at a fixed focus distance, like in the days of Nikonos (I to V) extension tubes and framers (remember them?). BTW, I believe the EOS Canon 50 macro lens only goes to 1:2 and needs a tube to go to 1:1 like many MF focusing macros. Tom
  15. It all depends on how careful you want to be. I know of one diver who had to drive to Anchorage from Seward after (shallow) diving. There is a 3000 foot pass. He brought along a DAN O2 kit to breath off of. I seem recall that the volcano visitor center was at higher elevation from the contour lines on the map I was using to drive - I did not go beyond the black sand beach (the one east of South Point) that day. BTW when folks fly and dive from float planes, the pilots will fly under 1000 feet after diving as a precaution. This is also an issue for rescues here as all the operational chambers in this area are in Anchorage, and there are lots of mountains between the water bodies. The dive site, which I did from a boat out of Kona, where Capt. Cook was killed as I recall was quite good, if this is what you are referring to. It is very close to shore. Although the vis was not the best due to wind and waves (in Feb), there was a lava tube dive near the distal point of a lava outflow that was one of the most spectacular. In a lava tube cul-de-sac there were 3 moorish idols going around in a circle on vertical plane, as if they were in a clothes drier (at about that speed)! Tom
  16. The trouble with adapting the RS lenses is the prism over-hang on the Nikons. There would not be enough clearance for both the lens and the housing wall-lens mount. There might not be enough room even with the camera cover removed. Although the RS lenses could be adapted to an EOS, becuase they do not have aperture rings this would make them problematic to use. The RS lenses were the first of the G type now being made for SLRs by Nikon! One would have to build a dSubeye to use the RS lenses at this point. Tom
  17. Helge, Your drawing is conceptually not all that different from Seacam's. The Seacam S45 has more elements so yours might be a tad cheaper. They have 4 lens elements between the prism and housing, and 5 lens elements, not including the port, between the prism and eye. The best UW viewfinder I have used is that of the RS. The 15 degree off-set is great and ones eye can be off-axis a bit and thinsg are still OK. The next level down would be the finders used in medium format housings - they have the advantage of looking at a larger ground-glass. Tom
  18. The UW housing shown in 2001 is the old 'Triton' housing made for Hasselblad by Hugy. If one really wanted these megapixels it might be better for now just to use one of the medium format housings in circulation and scan the film. Which Sinar? They make (made?) a special body called the Handy for the 47mm Super-Angulon that might be interesting UW (for just one shot per dive), but a view camera!!! However, I seem to recall seeing an old International Photo Technik magazine (Grossbild in German) a few decades ago with a view camera, probably a Linhof, UW in a plexiglass housing. Tom
  19. Tom_Kline

    An Idea!

    Many of the on-going threads seem rather chatty already! A consideration is the global particpation and attendent time zone effect this has. Things that can be 'canned' and looked at later are therefore better. Tom
  20. Be aware that going up to see the volcanoes requires an increase in elevation and plan your diving accordingly. We do not want anyone getting bent! Just the road to Southpoint from Kona goes up to about 1000 feet elevation if I remember right. Similar precautions for the other islands. For example, Haleakala (Maui) is about 10,000 feet! Aloha! Tom
  21. Congratulations! from the frozen (though not at this time of year) north Tom
  22. How about Louis Boutan's underwater pix from the 1890's? His self-portrait comes to mind. To TTL or not to TTL was not exactlly a concern back then ! Tom
  23. My original inspiration for underwater photography was seeing Douglas Faulkner's underwater photographs when I was a youngster, about 1970, in a Life Library of Photography volume and Modern Photography magazine. More recently, a decade or so ago, was first seeing Within a Rainbowed Sea by Chris Newbert. Tom
  24. I used a polecam for my avatar shot. The pole was cobbled together from Gitzo tripod parts and ULCS and Nikonos UW components - see attachments. The challenges where a bit different from the previous examples. Very shallow water with skittish fish. It was November, there was ice on the edges of the stream and snow and ice on land. The day length by then was very short - the valley received no direct light at all due to the low sun angle. To simulate ambient light I used an SB104 which was attached pointing down to the Nikonos bracket, which was duct taped to the pole out of the water. The shallowness and amount of suspended material precluded lighting from the side. I pre-focused and used an electronic remote control. I did wear neoprene! That is, chest waders! I did not use a dSLR but a filmSLR - a Nikonos RS with 13mm lens. I walked very slowly up to the salmon with the camera very near my feet. I estimated distance by looking straight down on the subject. I was able to shoot the salmon very close up. The avatar is one out of a series that I shot of the same fish - it did not move between shots. Tom
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