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ldh last won the day on August 28 2014

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About ldh

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  1. Hi Carla. Since I posted that query I realized the problem is only with my 50mm lens. (My 100mm lens works fine.) For my 50mm, I can't get my subject to focus in live mode when the camera is on AF. The focusing element stays red even when I try to fine tune it. I haven't had this happen before with this lens. I had some connection issues earlier so I thought it might be related to that or to the software, but with the 100mm lens working I am not sure. As I said, I am in the field (rural Turkey) so I was particularly concerned since I have a limited amount of time here. My solution is to focus in live mode manually which works fine and I am getting some great results! Thanks for responding!
  2. I am in the field and I am having a major issue with focusing in live mode. I use the Canon EOS Utility with a Rebel T3i. I set my camera to AF, take a shot in live mode, and then the AF switches automatically to MF where I cannot focus properly. I have not had this happen before and I am at a loss how to fix it. Any ideas?
  3. I have been doing RTI on human bones prior to their reburial. I have had good results with pathologies such as osteomyelitis, and other instances where the surface texture of the cortex is altered due to the pathology. In terms of porotic hyperostosis and cribra orbital, you will get a good view of the pin pricking but not the internal structure of the bones which is essential for any diagnosis (see Walker et al 2009), unless you have a cross-section of course. I think the applications of RTI to bones is highly worthwhile, and as you have shown, surface deformations or alterations are more clearly visible using RTI compared to other techniques. I would imagine dental studies would also benefit from RTI.
  4. Can you tell me how to get the flashes in the blended sphere to be more precise? I get a good distribution but the flashes aren’t as clean as I know they should be. I reduce my movement and the flash output with some success, but I still am not replicating what we got in class. I think it must have to due with light intensity. Most probable fix?
  5. Thanks Carla, the example helps. I am using the Canon Speedlite exII flash unit. I will experiment and see what happens.
  6. Can you give me some input on setting the level of the flash output? For example, if I am shooting indoors with little ambient light, (like in your studio or darker) starting with the settings Carla suggests f8.0, iso 100, 1/125 sec., what flash output is best? Is there a "sweet spot"? I understand increasing/reducing the flash output depending on aperture size, but I am not sure what I should be going for.
  7. Regarding neutral density filters, is it ok to use "variable" ND filters (ND3 to ND400) for RTI? Thanks, Lori
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