polarizer on moving front element

serial_lain · 18th February 2006

i have often read in reviews that using a polarizer on lenses with moving front elements can be a bit of a hassle.. seeing that i do not have a polarizer could anyone kindly shed some light on why this is so? and also the differences between a linear and circular polarizer if any.. thanks!

yyD70S · 18th February 2006

This is because if your lens has a rotating front element, you would have to adjust the polarizing filter after you've set the focus.

Circular polarizers are needed with just about any camera that has a through-the-lens metering system, or autofocus.

MDZ2 · 18th February 2006

Polarizers work by reducing stray reflected light coming perpendicular to the camera. To achieve this, the polarizer will have to be rotated until the maximum result is achieved. With front rotating lens element, everytime you focus on a subject, your polarizer would have gone out of phase, so you will have to keep readjusting the polarizer after you have focused.

serial_lain · 19th February 2006

ahhh i see thanks a lot!

18th February 2006	#1
serial_lain Member Join Date: Jan 2006 Location: north-east Posts: 714	polarizer on moving front element i have often read in reviews that using a polarizer on lenses with moving front elements can be a bit of a hassle.. seeing that i do not have a polarizer could anyone kindly shed some light on why this is so? and also the differences between a linear and circular polarizer if any.. thanks!

18th February 2006	#2
yyD70S Senior Member Join Date: Dec 2005 Location: Singapore Posts: 2,061	Re: polarizer on moving front element This is because if your lens has a rotating front element, you would have to adjust the polarizing filter after you've set the focus. Circular polarizers are needed with just about any camera that has a through-the-lens metering system, or autofocus. __________________ AI 16mm f3.5 \| AiS 35mm f1.4 \| AiS 50mm f1.2 \| AI 105mm f2.5

18th February 2006	#3
MDZ2 Member Join Date: Feb 2005 Location: Eastern Part Posts: 311	Re: polarizer on moving front element Polarizers work by reducing stray reflected light coming perpendicular to the camera. To achieve this, the polarizer will have to be rotated until the maximum result is achieved. With front rotating lens element, everytime you focus on a subject, your polarizer would have gone out of phase, so you will have to keep readjusting the polarizer after you have focused.

19th February 2006	#4
serial_lain Member Join Date: Jan 2006 Location: north-east Posts: 714	Re: polarizer on moving front element ahhh i see thanks a lot!