i am a doctor and take some photographs of the patients, mostly in operation rooms. i have F/N 65 body and "AF Micro Nikkor 60mm 1:2.8D" I also have "Sigma 28-80 with built in Macro"( Hardcore Nikonians plz excuse me ). To avoid going too close to the subject i occasionally use a Tamron 2X teleconverter. There is hunting occasionally with or without teleconverter attached, you know depending on the light conditions. I have heard that some Speed light ring flshes contain illuminator lamps.I need advise on using which ring flash. Which speed light should I buy??
#1. "RE: phlueeez advice!!!" In response to Reply # 0
This sounds like a fascinating topic. But so far the details are a little vague. Could you be more specific about the ideal camera-to-subject distance? And do you need the Speedlight for exposure, or just focusing illumination?
Some Speedlights have an Autofocus Assist illuminator built in. This projects a red pattern onto the subject for the camera's AF sensor to lock onto. I believe only the SB28 and its discontinued predecessors provide this. I don't know how much autofocus assist the ringlight provides; its illumination is mainly a composition aid.
The scenario you describe is the worst possible use of a teleconverter. Also, close up photography in general is a challenge for autofocus. Manually focusing by moving the entire camera, similar to focusing a handheld "reading glass", is much more accurate and quicker.
#2. "RE: phlueeez advice!!!" In response to Reply # 1
San Pedro Garza García, MX
LAST EDITED ON Nov-25-01 AT 06:17 PM (GMT)
The flash to use is the Nikon Ring Speedlight SB-29 or even the older SB-21 which can be found used. As for the lens, you may peek at the alternatives here. Perhaps the most cost effective is the 105mm f/2.8 micro Nikkor. Many years ago, Nikon made the great 200mm f/5.6 Medical lens with a built-in ring flash, introduced in 1962 and hard to find now (Thanks God!). Later, the 120mm f/4.0 Medical-Nikkor was developed. Edward O. Uthman, M.D., from the Pathology Department at VAMC Memphis, seems to agree with us when he states: "Nikon makes two excellent macros, a 60 mm and a 105 mm. Since they are aimed at the technical market, macro lenses tend to have excellent optics, are very durable ... Nikon's .. 105 mm AF macro lens allows a 1:1 focus. This allows you to take some breathtaking shots of otherwise unimpressive subjects, such as pituitary adenomas. You can even make a corpus luteum look spectacular." Aha!. Let's us know ....... Have a great time JRP (Nikonian at the north-eastern Mexican desert) My profile, My Gallery Previous photographic journey, before Nikonians: A Brief Love Story