That is a very nice build and I was surprised to scroll down and see the pictures because that wavelength looks just like a standard 532nm green instead of the lighter green that im used to seeing from the 520's
Yeah, like Scum said, it's the camera. If i would have thought of it, i would have put it beside a 532nm. Not sure if the camera would have captured it, but their is a visibile difference side by side.
I am still experimenting with the camera settings, trying to get the best shots.
What kind of camera are you using? If it's a decent consumer digital or DSLR, you should have the option to shoot in RAW format, rather than JPEG. Give that a shot if it's an option.