Thanks Drew, you’re right that the camera needs to be modified for full-spectrum work – the same is true for any infrared filter that allows any amount of visible light in (there are quite a few varieties).

First we can consider how IR filters work on unmodified cameras. Let’s say that the IR-cut filter in front of the sensor is 99% effective (It’s probably more than that). This means that if you put an infrared filter that blocks 100% of visible light and lets all IR light through, you can make an image with the remaining 1% that gets through the camera’s blocking filter. You can do with with a Hoya R72 filter at 720nm, or even filters that go deeper into the infrared spectrum at 850nm. You’ll be dealing with very long exposures (in the multiple minutes at lower ISO settings even in direct sunlight) and focus/composition can be difficult…. but it can be done!

Many infrared filters, like this new Kodak Aerochrome-imitating filter, allow some of the visible spectrum to be added to the infrared spectrum. If your camera is blocking most IR light, then the percentage of visible light would be FAR greater than the infrared light, so much so that it might as well not be considered infrared at all… but rather just a segment of the visible spectrum.

If the camera was modified for full spectrum work, however, then these filters can be used in front of the camera perfectly fine. An unmodified camera cannot use the blended visible/IR filters effectively and must stick to the IR-only options at 720nm or longer.

Aman, first of all – fantastic image. Second, I’m sorry you’re in this situation! While OnePlus says dealing with you properly would be nothing more than a rounding error, I beg to differ. They are being cast in a very unfavourable light by the photographic community, and as evidenced by this very podcast that message is rippling through the industry. Not making things right with you would be hurting them in the court of public opinion, making that “rounding error” worth paying attention to.

Please, keep me informed of any further news in this matter and we’ll mention it on the show!

Thank you again! I will share this with everyone I can 🙂

Great to hear the combination is working well for you Denis! The version III of the teleconverter is much better than the original design, but again you are adding additional optics to an established optical system so there are bound to be trade-offs. The only way I can see there not being as much degradation in certain scenarios is if the TC was designed for one lens only, and some lenses do have that as a built-in option… and they cost more than my car. 🙂

Great to know that lens is working out well for you!

Unfortunately, it is always price for us seniors that suck. I have taken some small bird shots at f-11 {the minimum) and the compression with the 2X III is large. Until I become rich and famous I will be dreaming of a 500 mm f-4. So long as I can get that tack sharp images with a bit of witchcraft and the images sell. I am golden.