Re: ISR video attenuator

>Dear Dr. Pelli,
>
> I am interested in buying the ISR attenuator. Before, I
>wanted to make sure it will match other parts. In the VRG web
>page it is said that it will only work well if the (RGB) monitor
>to be used have a Termination Switch. Is it so? Is that the case
>for both PC and MAC? Does it make a difference for the
>attenuator functioning if it is connected to a PC or MAC?

if you can switch out the termination, then you can drive all three guns
and have a white display. otherwise you can drive just the green gun and
have a green display. white is nice, but green is ok too. in my lab, our
displays don't allow us to switch out the termination, so we use them
green.

> Can you indicate any Sony model that will work well? Eisa
>says their models have the switch, but give no technical support
>in Brazil.

sorry, i'm not up to date on model numbers. what i know about this is on
the web page.
http://vision.nyu.edu/Tips/Monitors.html

> And last, the cheapest cientific grade photometer for monitor
>calibration (in cd/m2) I could find cost US$ 1500 (the optiCal).
>Any recomendation of a better offer would be appreciated.

what i know about this is on the web page.
http://psychtoolbox.org/measure.html

>Thank you for your time,
>Yossi

please direct general information questions, like this, to the
psychtoolbox forum, so that others can participate. david, allen, and i
receive copies of all forum letters.
psychtoolbox@yahoogroups.com

good luck.

denis

NOTE: denis.pelli@... is my preferred email address. Please use that
address. My "verizon.net" address will go away soon, partly because
Verizon forces me to use that as my return address.