Here's my situation. I would like to try some portraits of our 6 mo old with my 4x5 view camera. I only have a readyload holder and use TMX100.

With available light for headshots I'm at 2 sec exposures and theres no way he'll stay still for that long. So my question is:

Can I push the TMX100 2 stops to 400 with acceptable results?

Has anyone tried this? Are there any examples on the web that I can see?

I have searched and can find nothing.

Thanks for your expertise!