xtremediver 0 Posted March 11, 2006 I am just a little curious, has anyone tried the Sigma 8mm in a underwater housing? I am "thinking" that this might be an interesting lens on my 20D for close focus wide angle. What are your thoughts? Share this post Link to post Share on other sites
lauri 0 Posted March 15, 2006 I have the 8mm Peleng, which in my opinion is a much better investment than the Sigma. You don't really need autofocus with the DOF the 8mm FE provides. I'll try it out in a pool soon with ikelite #5503, with which it will vignette, but at least I'll get some idea how it might work. I'll post the results here. I think it might just work with #5503.15 or the low profile 8" dome. Here is a topside test shot with the lens, one straight out of 300d and the other defished (quick'n'dirty, you could get all the lines straight with some more work) 8mm peleng Same defished -- LN Share this post Link to post Share on other sites
Jolly 3 Posted March 15, 2006 I don't want to miss AF on my Sigma 8mm. It's really easy to get out of focus pictures, even with the Sigma 8mm lens. Especially if you want to do close focus stuff (DOF is related to reproduction ratio as well, even if the focal length is only 8mm). In addition, you'll lose aperture control because the Peleng doesn't communicate with the camera at all. Not so good for underwater IMO. On the other hand as Lauri said, the Peleng is cheaper and might be the better choice for some fun stuff. Sigma 8mm on full frame: Sigma 8mm on APS-C (10D / 1.6 crop): By the way, I have tried the Sigma 8mm with an 1.5 tele converter in order to equalize the lack of a 10mm / 180° diagonal fisheye for cropped sensors in the Canon lineup. Not exactly the finest image quality and lens speed (gets f5.6) but it works. Julian Share this post Link to post Share on other sites
lauri 0 Posted March 15, 2006 This far I've only had experience with the Peleng topside, at f8 it's sharp from 30cm to infinity. This will of course be different with dome port focusing distances, but I don't think it will be too difficult to find the sweet spot for infinity focus, which will be fine for most of my shooting (wreckscapes)... Closeup work may be different. Ikelite gear fits nicely on the aperture ring of the Peleng, or actually the lock/unlock ring, as it is a preset aperture lens. That way you can set the aperture to 22 before the dive to get full analog control of aperture with the lock/unlock ring. Peleng is a nice lens to play with until the Tokina 10-17 FE comes to stores. BR, Lauri Share this post Link to post Share on other sites
