100% not true. In our ghost tours, for example, we had a lady who caught a full body apparition with her iPhone!

Some of the greatest ghost photos were caught using a disposable camera.

So, it's all up to interpretation. If you can afford it, then go for it.

Anyone can take a picture or shoot video, but do you know how to use it? Hmmm...

Now, if you want to get into the technological side, browsing around for K2's, EMF detectors and investing in security cameras would be great, but only if youre ready for that step.

Thomas Edison once said "if we can evolve an instrument so delicate as to be affected by our personality as it survives in the next life, such an instrument, when made available, ought to record something.” 

Unfortunately, he would never know that answer, but Edison did try to make EVP recorder to communicate with the dead.

BUT...

The best tool or piece of equipment to hunt for ghosts...

Your sences.