The largest disadvantage of using the IR pass filter method is you still block IR light depending on what filter you use. The near IR wavelengths range from around 680nm to 1200nm using a 920nm pass filter for exposure control. E.g you're blocking nearly half of the near IR light wavelengths from reaching the camera's light sensor. The very light that you want to see, limiting the chance further of spotting a cloaked UFO.
So instead of using an IR pass filter for exposure control when using a Sony nightshot camcorder, I experimented with an ND4 filter only. The filters are used for preventing over exposure, it looks like a piece of tinted glass. The ND4 wasn't quite dark enough for bright sunshine so I had to wait for a lowish Sun to arrive in the early evening. An ND8 or ND8+ND2 combined would've been better for brighter conditions.
With this method a UFO reflecting IR light will stand out a lot more because a camera in nightshot mode, will see all of the IR light being reflected. Another big plus is you can even switch between spectrums when a UFO is spotted like I have in this footage here... (please watch in highest quality & full screen)
In this next video that I made, I show how easy it is to bypass the small micro switch that prevents the camcorder from being used in infrared nightshot mode during the day. The camcorder here is an analogue CCD TRV87E.
Unfortunately, the newer, higher resolution camcorders are so well made and compact, they are nearly impossible to modify and specialist help is needed.
This next piece of UFO footage was captured at around 3PM on 10 April 2011. The camcorder used is a modified Sony DCR TRV140E with a 1.7x tele-converter, recorded in infrared/visible light mixed and the manual focus in use.
The solid object that appears to be made up of two sections looks white in colour and also may only be reflecting IR light as no shadows or other colours can be observed. With all the concentrating trying to keep the object steady in shot, it never crossed my mind whether to switch between light spectrum's to see if the object would disappear in the visible spectrum only. No eye contact with the object was made as I knew it must have been so high in altitude and didn't want to risk losing it from sight. I estimate the object being of at least 25000ft in altitude as it looks like it disappears into the contrail/chem-trail of the passing plane.
Observed for around seven minutes, before heading north and disappearing out of sight.