JVC HD100 zoom in out of focus

[Justin Ferar]

Now that you’ve gone out and bought a pro camera it’s time to learn about pro lenses.

First- there is no auto focus on professional manual lenses like yours. This is a goodn thing! A very good thing as you will discover once you get used to it.

Second- your camera’s “back focus” or “flange back” needs to be adjusted which is a fairly simple process. You should get in the habit of making the adjustment before every shoot. As it will come out of alignment as it’s moved from different temperature zones.

Hook the camera up to a monitor (HD if you have one).

Zoom in on an object at least 3 meters away. Focus nice & sharp.

Zoom out all the way and loosen the little nut on the lens that is closest to the camera body. This is your flange back ring. Adjust the ring until the image is sharp. Tighten the nut so it’s firm. Zoom back in the object and if it’s sharp then you are done. If it’s not sharp then repeat the process until you get it right.

Don’t try to do this with the viewfinder- you kick yourself later.

I find that the easiest way to make the adjustment is at night. Use someones porchlight or a streetlamp as your focus object. Easy Peasy.

Hope this helps.

[Javier Lopez]

Hello!

Wow, thanks a lot for your time… I appreciate that information.

Thanks.

[Enrique Orozco]

…be careful if you shoot HD … focus seems to be more critical than in DV … I made some “out of focus” shoots relying only on what I see on my viewfinder and discover later that something was wrong with my adjustment ….

by the way, I know of some companies that offers HD lenses (not for this camera) WITH autofocus…I think it would be a nice option to have it (and if you want to be PRO, just don´t use it…)

Regards

EOR

[Kerry Brown]

When making a back focus adjustment ALWAYS open the lens iris wide open. Use nd filter to
get a lower light level for proper exposure. (makes focusing more critical which is what you want)

KB