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Sunflowers in my garden

Filters Multispectral Infrared
11 replies to this topic

#1 Stefano

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Posted 21 August 2020 - 12:33

Here are some images, taken recently and less recently of my sunflowers.

Filters:
UV: ZWB2 (2 mm) + chinese BG39 (2 mm)
VIS: chinese BG39 (2 mm) + polycarbonate goggles
IR: Hoya R72

UV. F-stop: f/2.8, ISO 1600, 1/8 s exposure.
Attached Image: P1000892.JPG

UV. F-stop: f/2.8, ISO 1600, 1/8 s exposure.
Attached Image: P1000135.JPG

UV. F-stop: f/2.8, ISO 1600, 1/8 s exposure.
Attached Image: P1000252.JPG

VIS. F-stop: f/7.1, ISO 200, 1/640 s exposure.
Attached Image: P1000217.JPG

IR. F-stop: f/7.1, ISO 200, 1/800 s exposure.
Attached Image: P1000208.JPG

IR. F-stop: f/7.1, ISO 400, 1/640 s exposure.
Attached Image: P1000496.JPG

The above is just a quick shot to give an idea on how tall this things are. I measured the tallest one some days ago, and it was 3.19 m (about 10 ft 5 in) tall.

I still have a little leak in the UV images. Yesterday my camera lens got stuck because glue from the filters I attach entered inside (I never put tape on the lens directly). I managed to fix it, but I slightly damaged the lens. The last photo was taken after this, so the camera still works. I will need an upgrade in the future, maybe years from now, but this camera will not live forever.

#2 colinbm

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Posted 21 August 2020 - 12:41

Hey these are fantastic Stefano.
Do you have to get on top of the wall to photograph the flowers ?

#3 Stefano

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Posted 21 August 2020 - 12:51

Yes, I have. A very uncomfortable position, very tiring. Or on top of a small ladder.

#4 Stefano

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Posted 21 August 2020 - 12:52

Anyway, thank you.

#5 colinbm

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Posted 21 August 2020 - 13:03

Stefano, If you want to cut the UV for your VIS shots, Rosco R3114, cuts close to 400nm.

Attached Image: 20200812RoscoR3114UVcutSun-Ref.png

#6 Stefano

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Posted 21 August 2020 - 13:11

I may consider it in the future. The ultimate 400 nm cut filter I would get one day (who knows when) would be 2 mm thick GG420. It doesn't make sense to buy it now for my camera, to attach it with black tape on a cardboard ring coming from toilet paper (these are my filters). Rosco R3114 would be more than enough.

#7 colinbm

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Posted 21 August 2020 - 13:29

Stefano, the GG420 will fluoresce under UV light :-(

#8 Stefano

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Posted 21 August 2020 - 13:42

Rosco doesn't? Even my R72 fluoresces in IR and deep red with strong UV.

#9 colinbm

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Posted 21 August 2020 - 13:52

The R3114 doesn't fluoresce.
Thanks for the tip on R72, I didn't know.

#10 Cadmium

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Posted 23 August 2020 - 22:52

Stefano, I like that last IR shot a lot! :smile:

#11 Stefano

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Posted 24 August 2020 - 05:49

Thank you!

#12 Andrea B.

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Posted 03 September 2020 - 16:15

I've certainly seen tall cultivated sunflowers, but did not know that they could reach 10'. Wow!

The IR sunflower is cool. The IR-absorbing, dark seeds provide an interesting contrast.
Andrea G. Blum
Often found hanging out with flowers & bees.