Hi I will be shooting seniors at a graduation this Friday after they receive their diploma against a wall holding the diploma. I will be using a D300 w/18-105 lens and sb700 flash. What would be the best iso to set the camera on to achieve the best possible shot. The lighting will be semi low.
As Gerold says, the base ISO is a good place to start.
I tend to up the ISO just so the flash does not work as hard and to slow down the battery drain. With my D200 I usually shot flash pictures at ISO 400. The D300 has noticeably better noise handling than the D200, so I would probably shoot it at ISO 800 like I do with my D700.
---------+---------+---------+---------+---------+ Joseph K Seattle, WA, USA
While shooting at base ISO will provide the best dynamic range and lowest noise, if you are shooting more than 10 or 15 images, you will start having overheating issues with a Speedlight since it will be firing at or near full power. If that is the case, turning the ISO up to 400 or even 800 will help reduce the thermal load on the flash and allow you to capture more images per unit time.
Thanks for the info I shot a 400 ISO and did not have any issues what so ever I also set the flash to TTL. I have another question, I am looking at a Tamron 17-50 2.8 lens to add to my gear. Would a 8 pin be better or a 5 pin lens work better with my D300 ?.
I assume you are referring to the Tamron: SP 17-50mm f/2.8 Di II VC and the SP 17-50mm f/2.8 Di II. Both will work perfectly on your D300 or any other Nikon DSLR. The VC (Vibration Compensation) version is optically better and has VC and is a little larger and heavier than the non VC version.