Other Sunflowers

[Stefano]

These sunflowers grew from the seeds collected from last year's sunflowers. Yesterday and today I took some UV images of them with my full-spectrum Canon EOS M and a Soligor 35 mm f/3.5 lens.

 

Filter: ZWB2 (2 mm) + Chinese BG39 (2 mm). Lens at f/3.5 or f/4. In-camera white balance on a paper tissue. All photos handheld, so not very sharp.

 

ISO 12800, 1/30 s exposure

 

ISO 12800, 1/30 s exposure

 

ISO 12800, 1/15 s exposure

 

ISO 25600, 1/15 s exposure

 

ISO 6400, 1/15 s exposure

[microbat52]

Oh so nice! Im going to try the wb on paper, came out great!

[Stefano]

Thanks. If you have it, PTFE/Spectralon is the best, but I think that a paper tissue (not printer paper) works well.

[Andrea B.]

And sometimes you can use the street pavement for WB.

 

Stefano, those are some high ISOs for sure! But it got you some handheld speeds.

[Andy Perrin]

Oh so nice! Im going to try the wb on paper, came out great!

I don't recommend that unless you have Stefano's special tissue paper supply. Here in the US, the paper all has fluorescent brighteners that mess it up. Get some PTFE on eBay!

[Stefano]

My camera handles noise pretty well at those high ISOs (I have denoising applied in-camera).

 

In the US they put brighteners in tissue paper too, so that when you blow your nose the paper is super white? That's odd for me, things are probably different in Europe.

 

Try to illuminate one with UV. Mine have a very dim bluish-white fluorescence. Normal paper has the typical bright blue fluorescence. But really, PTFE is the best, you can be sure it will work.

[Andy Perrin]

We must make everything 10 times brighter and whiter in the US! Even my toilet paper has brighteners. In fact you see the pattern more clearly if you shine a UV torch on it.

[Andrea B.]

I can see the headlines now: Well-known SWIR Photographer Temporarily Blinded by Fluorescent Toilet Paper !!

[colinbm]

What is the Chinese filter you used please, they are never equivalent ?

[Stefano]

You mean the Chinese BG39? It's a filter I bought on Aliexpress about two years ago, I don't know its transmission spectrum and so I can't compare it to Schott BG39.