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M200 vs. M50, and Infrared Photography Question

Started 8 months ago | Discussions thread
OP The Lamentable Lens Senior Member • Posts: 1,111
Re: M200 vs. M50, and Infrared Photography Question

Larry Rexley wrote:

[SNIP]

Keep in mind the Tiffen Hot mirror filter is still on fire-sale, today's price is $11.11, this may make full-spectrum very attractive giving you a second normal-light camera with that filter. (The 77mm Tiffen hot mirror filter which I bought for $49 for the Rokinon 135mm f2 lens last week is $141 today --- their pricing is crazy!)

https://www.amazon.com/Tiffen-49mm-Hot-Mirror-Filter/dp/B00004ZCL4/

Thanks -- that's a very attractive option, actually.

[SNIP]

True... Here's a YouTube link to a video from Rob Shea, who posts many good videos about choosing an IR camera, trying different filters, and processing.... you might find his videos really helpful. This one is about using an orange filter around 550 nm to ultra-color IR. In a matter of weeks I'll scour eBay for a cheap orange filter to try that out, once I've tested the Tiffen 47 deep blue filter for chrome IR!

https://www.youtube.com/watch?v=sPrd3GgpJc8

I stumbled upon Rob Shea's videos fairly early in my IR research, and they've been quite helpful.

[SNIP]

With the 720 nm conversion, the 720 nm filter is installed over the sensor. If you use a full-spectrum camera with a 720 nm lens filter, a nearly identical filter is used in front of the lens, so I would expect the exposures to be nearly, or exactly, the same.

You got me curious, so I did a quick test out the window pointing at a tree with foliage with my cameras just now to get a comparison. Pointed only at foliage (which is bright in IR but darker than medium gray in visible light), I set the cameras to ISO 100 and used an f1.4 lens on both, set to f1.4:

- Unconverted Canon M6ii, no filter: 1/1000 s

- Unconverted Canon M6ii, Hoya R72 filter: 10 seconds

- Full-spectrum M200, no filter: 1/2000 s

- Full spectrum M200, Tiffen hot mirror filter, 1/1600 s

- Full spectrum M200, Hoya R72 filter: 1/640 s

This is super helpful -- thanks a lot for taking the time to do it!

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