Re: New Camera Setup
Did you ever get around to buying new gear? If so what did you get?
Taking pictures of art behind glass can be tricky. I was going to recommend that you remove the art from the frame if that's possible but you also stated that your art is very glossy so you will still have to figure out a way to eliminate the glare.
You didn't say how large your paintings are. Sometimes with smaller work, the glare can be reduced by the placement of the lights. Most people recommend placing the lights at a 45 degree angle to the painting but the angle depends upon how close the camera is to it. The closer the camera is to the art, the wider the angle has to be.
You're correct in thinking that you will probably need a polarizing filter to truly eliminate the glare. I use a circular polarizing filter on the lens. The part that is often overlooked is that for a polarizing filter to work, the light source also has to be polarized. Sunlight is polarized but photographing your art outdoors may not appeal to you–there's the weather and changing lighting conditions etc.
You can buy sheets of polarizing material and place them in front of your lights. Using polarizing filters on the lights and the camera really reduces the amount of light that reaches the camera so will have to use longer exposures to compensate for this–a tripod is a must.
Something to consider when choosing a light source is that heat will ruin the polarizing filters over time. I ruined mine in roughly 3 years, I'm currently testing out LEDs because they're cooler.
I hope this helps!