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segal3

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Everything posted by segal3

  1. Sorry! - yours is actually probably a Shorthead Fangblenny (Petroscirtes breviceps). I think the photo in Reef Fish ID is a bit misleading for P. variabilis...
  2. I remembered you posting this, Todd, and checked in with Dolphin Scuba before considering alternate sources. Despite a deadline, they made sure to arrange to get me the item on time - excellent service!
  3. The Tokina has an internal baffle - 10mm is just not a usable focal length with the 1.4x teleconverter on full-frame. A 1.5x teleconverter may just get you there, though...
  4. Selling the very popular Nexus CL-100 Close-up Diopter, also known as "Woody's Diopter." This model fits Ikelite and Nexus flat ports, and adds approximately 25% refractive magnification and decreases camera-to-subject distance for macro work. In good condition - a few light scratches on the outer plastic frame as in the photo, but the lens itself is clean. Built-in lanyard. Retails for for USD$90, asking USD$67 OBO.
  5. This Inon UWL-100 (type-2) lens has been sitting around in a box ever since I moved away from a point-and-shoot camera a few years back. The glass is in mint condition, and the lens screws in to 67mm threads to provided as much as 100° view and allows extremely close focusing distances. Comes with front/rear lens caps and a Save-a-Lens-Kit leash that slides onto a strobe arm or similar to prevent loss of lens if dropped. The lens retails for USD$330 - asking USD$250 OBO. More images of lens:
  6. As expected, it's simply standard exposure and fill flash. Per comment:
  7. segal3

    Quoting

    I'm going to agree with Jim here...if you're not highlighting a specific part of a previous post, please do not indiscriminately quote the entire text!
  8. Variable Fangblenny (Petroscirtes variabilis). Fairly common on mooring lines and such...
  9. Big Sur is an unspoiled wilderness area of California consisting of the Los Padres National Forest and a number of state parks, forming a coastal region threaded only by Highway 1 and the occasional country road. With Monterey and Morro Bay at its northern and southern borders, respectively, the coast is exposed without shelter to the consistent swell of the Pacific Ocean, and dive opportunities are few and far between. Each year, the Truth Aquatics Vision liveaboard, normally based out of Santa Barbara, schedules a summer charter departing from Morro Bay to dive the relatively pristine waters of Big Sur for four days. I joined a trip in June of 2007, and finally had the time to put together a summary gallery of images. Visibility ranged from a mediocre 10ft (it is California! ) to an exceptional 50-60ft, and there was a refreshing abundance of fish and invertebrate life. For all the images, visit the Big Sur 2007 gallery - I always appreciate constructive criticism (or just regular criticism ).
  10. Adjusting white balance adjusts the tonal balance in the image. Especially when exposing to the right, color channels can be prone to clipping and/or introduced noise if significant adjustments are made to white balance after the shot is taken. Setting white balance before the shot is taken helps to alleviate this issue (and obtain proper exposure for those watching highlights), though Auto WB has become fairly accurate, at least with still photography.
  11. For what it's worth, 'H2o junky' accessed Wetpixel using an IP that resolves to the same city (Aberystwyth) as that used in the contact information for slickactivewear.co.uk .
  12. I recently took a 1Ds III and an original 5D to South Georgia and the Antarctic Peninsula for two weeks - neither had any issues. Personally, I'd be a bit concerned to go on a Luminous Landscape trip with the amount of unprecedented failures that seem to occur!
  13. LAB conversion destroys color information, unfortunately. See Bruce Lindbloom's discussion for more information...
  14. I'm not sure of the benefit of a comparison involving refractive magnification - you're either shooting underwater or not!
  15. How exactly is a 105mm lens on DX underwater like a 212mm lens topside?
  16. I sold it . With the teleconverter, I felt it too slow (f/5-6.3) and lacking the quality I was looking for. The usual benefit of using a fisheye lens underwater is the ability to obtain sharp corners nearly wide-open, or without stopping down as much as a typical rectilinear. Unfortunately, the lens appears to perform more poorly (from center crops) once the teleconverter is added until it is significantly stopped down, defeating that benefit. Your results may vary!
  17. Ron - Jealous of the rockhoppers and nesting albatross! Inclement weather would've been a nice change on my expedition, excepting a storm in the Falklands. Did you make it below the Antarctic Circle?
  18. Tokina 10-17 (and w/ 1.4x TC) on 1Ds Mark III (Warning - long post) Shot some newspaper classifieds - I really hadn't realized the wild amount of image plane curvature with a fisheye lens prior to this. Distance from the newspaper was approximately 3-4". Tripod was on carpet so I used 2sec timer, but I did bump it forward once or twice - it doesn't really impact the actual image much, just a micro-change in near/far perspective. All files converted from RAW in DPP with no adjustments, sharpness level of 5. (No additional PP) I've grouped equivalent focal lengths together for relatively quick comparison (i.e., Tokina 10-17 @ 14mm and Tokina 10-17+1.4xTC @ 10mm (14mm equiv.) are grouped) Tokina 10-17 @ 10mm Overall field of view sample: 100% Center and corner crops: f/3.5: f/4: f/5.6: f/8: f/11: f/16: Tokina 10-17 @ 14mm Overall field of view sample: 100% Center and corner crops: f/4: f/5.6: f/8: f/11: f/16: Tokina 10-17+1.4x Kenko TC @ 10mm (14mm equiv.) Overall field of view sample: 100% Center and corner crops: f/3.5 (f/5 equiv.): f/4 (f/5.6 equiv.): f/5.6 (f/8 equiv.): f/8 (f/11 equiv.): f/11 (f/16 equiv.): Tokina 10-17 @ 15mm Overall field of view sample: 100% Center and corner crops: f/4: f/5.6: f/8: f/11: f/16: Tokina 10-17+1.4x Kenko TC @ 11mm (15.5mm equiv.) Overall field of view sample: 100% Center and corner crops: f/3.5 (f/5 equiv.): f/4 (f/5.6 equiv.): f/5.6 (f/8 equiv.): f/8 (f/11 equiv.): f/11 (f/16 equiv.): Tokina 10-17 @ 17mm Overall field of view sample: 100% Center and corner crops: f/4.5: f/5.6: f/8: f/11: f/16: Tokina 10-17+1.4x Kenko TC @ 13mm (18.2mm equiv.) Overall field of view sample: 100% Center and corner crops: f/4 (f/5.6 equiv.): f/5.6 (f/8 equiv.): f/8 (f/11 equiv.): f/11 (f/16 equiv.): Tokina 10-17+1.4x Kenko TC @ 15mm (21mm equiv.) Overall field of view sample: 100% Center and corner crops: f/4 (f/5.6 equiv.): f/5.6 (f/8 equiv.): f/8 (f/11 equiv.): f/11 (f/16 equiv.): Tokina 10-17+1.4x Kenko TC @ 17mm (24mm equiv.) Overall field of view sample: 100% Center and corner crops: f/4.5 (f/6.3 equiv.): f/5.6 (f/8 equiv.): f/8 (f/11 equiv.): f/11 (f/16 equiv.):
  19. In February of last year I tested the close-focus abilities of the Tokina 10-17 alone and with a Kenko 1.4x TC on the 1Ds Mark III (topside). I'll see if I can dig up the images...
  20. Stephen - All observations of changing FoV aside (which we should be able to quickly figure out on land with a tripod-mounted camera and swapping diopters), what increases in camera-to-subject distances occurred? I imagine a depth-of-field increase could potentially mask corner sharpness issues... I think the concern, as with many experiments, is that we haven't adequately limited the possible permutations!
  21. Come on, DPP isn't that bad. Only 50 years .
  22. Hi Claudia - Additionally, you posted a link to the website in this thread - double-posting is generally discouraged.
  23. Be sure to read the General Ground Rules for the Photo and Gallery Showcase Forums. Please - no domestic animals!
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