Any photo experts here that could help please.

I’ve been trying to get good BPEL pics to document my progress, I do this with my body and its good to see the changes. Every time I take a pic the ruler either looks smaller/bigger at one end or has a bending look to it, I would really like a good pic of the ruler being straight as its supposed to and not look like I’ve shopped the pic. I’m using a Samsung PL100 12.2 MP Digital Camera and I know zero about cameras, is this a common thing with portable cameras?

I’m wondering if I should invest in a better camera or if this is a photographer problem rather than the tools but I don’t see how. I set the tripod up and get in position, back against the wall and so on.

Another option would be an Hd camera to record video?

Self timer, tripod, from above, and use the zoom feature to eliminate the wide angle lens bending effect. Or just grip the ruler along with your dick and take the pic with the other hand.