Digital IR

[Peter De Smidt]

Hi Jon,

Sure, a bunch of ones do. Kasefilter, Haida, Desmond/ice, and probably others. There are so many new brands.....You have to use an adapter, as the magnetic filters need a steel ring that they can stick to. So, for example, you put a Kase magnetic filter adapter on the lens. You can then use a magnetic lens cap. Take the cap off and simply set the filter in place. What that kind of system, there's no need to thread on filters in the field. For me, threading a filter is often not a problem, but sometimes it is, because the camera is in a difficult position, and it's especially important if I don't want the camera to move at all when I change filters.

Honestly, this was more important with my D600 and a R72 filter than with the Z9. With the D600, I had to take the IR filter off to compose and focus a photo. With the Z9, I don't have to, and so having magnetic filters isn't quite as important....but I already have a bunch of big (and expensive!) ones, and so I'd like to stick to that system.

[tuco]

Football by tuco, on Flickr

M9, Voigtländer Nokton 50/1.5, R72 Filter

[tuco]

The Press Box by tuco, on Flickr

M9, Zeiss 35/2, R72 Filter

[jon.oman]

Football by tuco, on Flickr

M9, Voigtländer Nokton 50/1.5, R72 Filter

I like this!

[Peter De Smidt]

I like this!

Me, too! That was really well done, Tuco.

[tuco]

I like this!

Me, too! That was really well done, Tuco.

Thanks you guys.

[tuco]

Clean Air Zone by tuco, on Flickr

M9, Zeiss 35/2, Hoya R72 Filter

[Peter De Smidt]

I did some quick tests this morning with a Z14-30 lens and a cheap 82mm 720nm filter. There might be a little vignetting from the filter, but it's very minor. Autofocusing through the filter was fine. I used ISOs from 64 - 16,000. Even 16,000 had much less noise than Kodak High Speed Infrared. It might be useful to minimize subject motion, if needed. As you go up in iso, dynamic range goes down, but even on a sunny day, with corresponding deep shadows, the dynamic range of the camera was plenty. A good site to check for these things is: https://www.photonstophotos.net/Charts/PDR.htm
It will tell you if you have a dual gain sensor. For example, with my Z9, if I go higher than ISO100, I might as well go to ISO500, as it has less noise than the intermediate ISOs.





The first photo is at ISO 64. The second is at ISO 16K.

At 14mm, the lens looked a bit soft in the corners, but there was wind.....I'll have to do a brick wall test when I'm feeling a bit better.

[Tin Can]

Good news for me

I have a 720 and no chance of Vignetting on my crop frame Z

Now I need to find it!

[jon.oman]

Peter, Interesting test. That lens is on my wish list. Although I would also like the 14-24!