D dRebelXT New Member May 14, 2005 1,636 0 0 Feb 10, 2006 #1 Last time read about one uses 105mm macro with a 1.4X TC. I am wondering whether my Tamron can use any 2X TC on my 350D. TIA for your advice.
Last time read about one uses 105mm macro with a 1.4X TC. I am wondering whether my Tamron can use any 2X TC on my 350D. TIA for your advice.
zaxh81 Senior Member Jan 29, 2003 4,338 0 36 Earth Feb 10, 2006 #2 So 90mm with 2x TC becomes 180mm F4?:dunno:
D dRebelXT New Member May 14, 2005 1,636 0 0 Feb 10, 2006 #3 zaxh81 said: So 90mm with 2x TC becomes 180mm F4?:dunno: Click to expand... 180mm F/5.6 right? ;p It's quite normal for me to use F/8 in order to gain the DOF. Wanted to know is, the model of TC and the impact on sharpness. It's difficult to chase dragonflies too close with 90mm lens.
zaxh81 said: So 90mm with 2x TC becomes 180mm F4?:dunno: Click to expand... 180mm F/5.6 right? ;p It's quite normal for me to use F/8 in order to gain the DOF. Wanted to know is, the model of TC and the impact on sharpness. It's difficult to chase dragonflies too close with 90mm lens.
