• Ultraviolet Photography
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Drones

48 replies to this topic

#1 Cadmium

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Posted 18 August 2018 - 03:03

Spaced out on YouTube again... :blink:
These are getting tempting, but I don't know a thing about it.
Anyone around here ever done any drone photography?
https://youtu.be/XU4rEbCxSW0

#2 Cadmium

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Posted 18 August 2018 - 05:02

Well, anyway, then I found this video, showing a first flight... (by experts, I might add, ha!)
It kind of had me on pins and needles... I think this setup is fairly expensive, so you don't want to crash it. Would take a lot of experience to learn to fly this thing, it looks like to me anyway.
Not sure it would support my D850 + 8mm fisheye + RG715 filter, maybe though.
He he he...
https://youtu.be/dlAfq7uqxAY

Anyone here done any drone photography? UVIR, Normalized Difference Vegetation Index (NDVI), or anything else?

Edited by Cadmium, 18 August 2018 - 05:15.


#3 nfoto

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Posted 18 August 2018 - 09:34

That drone shouldn't crash -- expensive mishap -- but reality bites and I never have talked to a drone operator that entirely had avoided crash incidents.

I would probably start with something less exotic/expensive myself.

#4 Andy Broomé

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Posted 18 August 2018 - 21:26

I think it would be safer to do a full spectrum conversion on a cheap drone and find some way of attaching a small filter to it, than to risk a DSLR. I suspect the modern coated lenses in drones would be useless for UV, but IR would most likely be possible.

#5 bobfriedman

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Posted 18 August 2018 - 21:41

View PostCadmium, on 18 August 2018 - 05:02, said:


nice pelican case

#6 enricosavazzi

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Posted 21 August 2018 - 07:04

A few years ago I did some investigation into using a GoPro action camera for UV imaging. It turns out that the model I tested has no (strong) built-in UV- and IR-cut filter. The actual UV- and IR-cut filter is a coating on the rear element of the lens. I had some success in using legacy small-format movie lenses (mostly for super-8 and 16 mm film) and small UV-pass filters. The UV response was limited mostly to the 380-400-ish nm band.

http://www.ultraviol...__fromsearch__1

Although not very cheap, it is certainly cheaper, sturdier and lighter than a DSLR.

Edited by enricosavazzi, 21 August 2018 - 07:07.

-- Enrico Savazzi

#7 JCDowdy

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Posted 21 August 2018 - 13:28

Anyone ever have hands on a Z CAM E1?

I am not a drone pilot but this is small and cheap has 16MP MFT Panasonic CMOS sensor

They are now on sale at B&H for a tempting price.

#8 WiSi-Testpilot

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Posted 26 September 2018 - 21:08

Today I made a first UV flight with my DIY multicopter. I use a full-spectrum Sony A 6000 with the SELP1650 lens and this UV filter:
SP2 UV-400N
http://www.optic-mak...missionskurven/
The camera is simply mounted at a tilt-servo without damping. Shutter (half-press & full-press), zoom and tilt is controlled via radio-control.
The values of the pictures are 1/10s (car), 1/20 (landscape), f3.5, ISO-4000. When the sun came out, the batteries were empty. I swapped the colors RGB -> BRG to enhance the intensity.
In order to improve the result I need next to more sun a gimbal, a better filter and another lens.
Tomorrow a sunny day is expected...
Best regards,
Wilhelm

Attached Images

  • Attached Image: CQ_A6000_UV_26_9_2018.JPG
  • Attached Image: CQ_A6000_UV_26_9_2018_1.JPG
  • Attached Image: UV_26_9_2018.jpg
  • Attached Image: UV_26_9_2018_1.jpg

Edited by WiSi-Testpilot, 26 September 2018 - 21:16.


#9 Andy Perrin

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Posted 26 September 2018 - 21:29

Did you white balance the images? These look very tinted. Anyway, you are definitely getting some results! You will need to optimize your setup to get faster exposure time I think. The motion blur is significant here. I think the lens would be the first thing to change. Also that filter is not passing much, although the blocking of IR looks fine.

Edited by Andy Perrin, 26 September 2018 - 21:33.


#10 WiSi-Testpilot

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Posted 26 September 2018 - 22:55

Andy, I made no white balance, because the image consists of blue and red only, see the screenshot. The choice of the colours is arbitrarily, I think.

@all, which light weight lens for Sony e-mount do you recommend?
Best regards,
Wilhelm

Attached Images

  • Attached Image: red&blue_only.jpg


#11 Andy Perrin

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Posted 26 September 2018 - 23:06

Typically we make our images white balanced and the reason you can't do that here is because your lens/filter isn't passing light far enough into the UV (to sufficiently low wavelength, I mean). You are only getting a tiny bit of the UVA near 400nm, I think. For a lens, you should consult our sticky and use one of the recommended lenses there. They are old manual lenses, so don't expect autofocus or stabilization. There are NO native lenses that pass significant UV for Sony. I use the Novoflex Noflexar for 35mm and metal EL-Nikkor 80mm/5.5 for 80mm. You should look into either a filter stack such as UVIR Optics sells (Cadmium of our forum), or a Baader U or Straightedge U. Straightedge may have some benefit for faster exposure. To see how a UV image with white balance can look, check out one of the flowers, like this:
http://www.ultraviol...ttish-laburnum/

#12 WiSi-Testpilot

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Posted 26 September 2018 - 23:18

Ok, I understand.
Thank you for your hints and recommendations.
Best regards,
Wilhelm


#13 Cadmium

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Posted 26 September 2018 - 23:22

WiSi, Very cool and nice looking drone you have there. :-)

#14 WiSi-Testpilot

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Posted 27 September 2018 - 07:47

Cadmium, thank you.
In the future I will mount the A6000 with a gimbal on the copter shown below. Currently a thermal camera and the Sony RX0 are attached. In the picture together with the small DJI Mavic the thermal camera and a Vis/NIR camera are mounted. Two images with results are shown too.
Best regards,
Wilhelm

Attached Images

  • Attached Image: Dual.jpg
  • Attached Image: EWQ_Vue_ProSight_Mavic.JPG
  • Attached Image: defekte_Panels_Vis.jpg
  • Attached Image: defekte_Panels.jpg


#15 WiSi-Testpilot

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Posted 27 September 2018 - 20:59

That's my last picture for now (1/6s, F/4, ISO-4000). Interesting is the pattern on the grass of our airfield.
Now I will improve the equipment.
Best regards,
Wilhelm

Attached Images

  • Attached Image: UV_27_9_2018.jpg


#16 Andy Perrin

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Posted 27 September 2018 - 22:26

Oooh, that is a very nice shot. It is possible to use the SmartDeblur software (version 2.3) to extract some additional detail from that:
Attached Image: UV_27_9_2018_res.jpg

#17 WiSi-Testpilot

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Posted 27 September 2018 - 23:08

Yes, that looks very good. Thank you for the tip.
Best regards,
Wilhelm


#18 WiSi-Testpilot

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Posted 19 October 2018 - 17:30

I would like to shorten the exposure time to reduce the motion blur. Therefore I bought a Sony SEL 16mm 2.8 (SEL16F28) pancake lens via e-bay. It is very light and has only 5 elements. For testing purposes, I took two pictures with my lenses. I had held the UV filter in front of the new lens, because the threads are different. As expected, the pancake is much better for copter applications than the SELP1650 with 9 elements. Now I will order a Venus filter when it is available again.
Best regards,
Wilhelm

DSC01808 (1/13s, F/3.5, ISO-3200) (SELP1650)
Attached Image: DSC01808.jpg


DSC01807 (1/60s, F/2.8, ISO-800) SEL 16mm 2.8 (SEL16F28)
Attached Image: DSC01807.jpg

With the pancake the image contains green too, compared to #10.
Attached Image: green.jpg

Edited by WiSi-Testpilot, 19 October 2018 - 17:50.


#19 Andy Perrin

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Posted 19 October 2018 - 19:21

Definitely an improvement but why don’t you buy one of the lenses on the sticky which we know are good for UV?

#20 WiSi-Testpilot

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Posted 19 October 2018 - 20:33

I'm afraid that I get problems with non-e-mount lenses on the copter. Therefore my next steps are another filter and a gimbal. Furthermore the pancake is light and seems good for NIR above 900 nm.

Question: what values would you expect for the picture above with a good UV lens and a Baader U filter?
Thank you.
Best regards,
Wilhelm