In Photoshop, it seems there´s no way to zoom your picture in the too-small window of the LensFlare Filter. This is something annoying if you are trying to place a LensFlare in a specific point of a big picture, as you have absolutely no accuray in the placing point. Just an example:
Imaging you want to process the image on your left, a picture of the most spectacular beauty in the motor vehicle industry ;). The objective is to add the Audi LED Lights effect, using the LensFlare filter. You open the LensFlare window up, and you find something like this:
There´s no single way to add the lens flare, one by one, with enough precission, as you cannot zoom in that window. So here is a simple way of fixing this:
1.- Activate the “Info” window, set your rulers to use “Pixels” as units, and keep the coordinates of the specific point where you want to add the LensEffect
Maybe this second approach is even more useful:
1.- Create a new layer and paint it all black. Add the new lens flare in that layer, wherever you want.
2.- Change the kind of layer from “Normal” to “Screen”, so our lensflare is correctly blended with your background
3.- Now you can move and scale your lensflare as desired. You can even adjust it´s colors, exposure, brightness and contrast, everything.
This is the result of working this way: