• Ultraviolet Photography
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Drones

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#21 Andy Perrin

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Posted 19 October 2018 - 22:04

I don't own a Baader myself, so I'm not sure. My usual exposure times are similar to the above but I get a lot more color. I am using S8612 1.5mm + UG11 2mm though.

Edited by Andy Perrin, 19 October 2018 - 22:04.


#22 WiSi-Testpilot

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Posted 20 October 2018 - 08:04

Your filter combination seems to me to be comparable to the Venus filter.
For applications on the ground I want to buy a good UV lens. However, currently I have no experience with adapters for e-mount. For instance, is it possible to use the Novoflex Noflexar 35mm with e-mount?
Best regards,
Wilhelm

DSC01752 (1/500s, F/3.5, ISO-100) (SELP1650) Green.L 760 nm
Low quality, need a gimbal.
Attached Image: DSC01752.jpg

Golden October, DSC01710 (1/800s, F/3.5, ISO-100) (SELP1650) Green.L 760 nm
Attached Image: DSC01710.jpg

#23 Andy Perrin

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Posted 20 October 2018 - 14:20

My filter combo is nowhere near as good as a Baader for exposure. I’m losing at least half a stop I think.

I have a Sony and a Noflexar and I use them all the time. Fotodiox makes a whole line of adapters for E-mount that work fine.

Edited by Andy Perrin, 20 October 2018 - 14:20.


#24 Cadmium

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Posted 26 October 2018 - 22:39

I know this is off topic, even off board, so to speak, but this was done with drones, and I thought it was so beautiful, even the accompanying music, that I wanted to post it here.
https://youtu.be/ChnKSt4SbOI

http://www.studiodri...nchise-freedom/

#25 Andrea B.

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Posted 27 October 2018 - 14:33

For applications on the ground I want to buy a good UV lens. However, currently I have no experience with adapters for e-mount. For instance, is it possible to use the Novoflex Noflexar 35mm with e-mount?

The Noflexar 35/3.5 was made originally in Exakta, M42 and F-mount with flange focal distances, respectively, of 44.7, 46.5 and 45.46 mm. The FFD for E-mount is 18mm. So any adapter will be an extension and not require any glass elements.

Just as one example of what is available, here is a link to the Fotodiox "F-mount lens to E-mount body" adapter: https://fotodioxpro....ducts/nikf-snye

Novoflex and Fotodiox are two adapter brands which are well-made. There are many other choices. If you buy a less expensive adapter from Ebay, do be sure to thoroughly check that it fits well and does not warp the body mount or have any leaks.



My filter combo is nowhere near as good as a Baader for exposure. I’m losing at least half a stop I think.

That's not really much to worry about at all, methinks. Particularly if your filter set cuts IR well.
Andrea G. Blum
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#26 WiSi-Testpilot

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Posted 27 October 2018 - 17:40

Andrea, thank you, your explanation and the link are very helpful. So I will look for a good Noflexar 35 / 3.5 and order the adapter.

On the copter I would like to use the Sony Pancake SEL 16mm 2.8, because it is very light. At the moment I am mounting the camera on another copter (see picture) so that the camera is closer to the center of gravity and the construction is stiffer. It may last still a few weeks. When the conversion is finished I will show a few pictures. I asked Baader about the U filter. It is not available at the moment. They are making a new batch. I have also ordered a 950 nm IR filter suitable for the pancake.
I am very interested in the comparison between Noflexar 35 / 3.5 and the Sony lens.
Best regards,
Wilhelm
Attached Image: LQ_CS_U_Duo_6_12_17.JPG

#27 Andy Perrin

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Posted 27 October 2018 - 20:10

For a LIGHT UV-capable lens, my Porst Weitwinkel 35mm/3.5 lens is plastic and does a really nice job of transmitting UV. It is a relabeled version of the Ennalyt 1:3,5/35mm Enna Werke München. It still requires an adapter, but the lens itself weighs 132 grams.

#28 dabateman

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Posted 28 October 2018 - 03:26

View PostWiSi-Testpilot, on 27 October 2018 - 17:40, said:

I asked Baader about the U filter. It is not available at the moment. They are making a new batch.

This is very interesting. If you order one and receive it please let me know what the outside markings on the filter say.
Thank you.

The only issue you may have with known UV lenses is most will act like telephoto on your copter and you may need to fly higher to get similar angle your used to. Thus adding more actual air space and decrease you image quality in UV. Fortunately they are cheap. So you may be ok with the pancake 16mm vs a 35mm. But you won't really know until you test it.


#29 Cadmium

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Posted 28 October 2018 - 04:12

I think you should paint it like a Ladybug for Halloween. :)

#30 WiSi-Testpilot

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Posted 28 October 2018 - 08:13

@Andy, thanks for the hint. But I will try to get a Noflexar 35 / 3.5. Is it true that the filter thread is 49 mm as with my Sony pancake?

@dabateman, of course I will show a photo and a test.
Tele on the copter is not unproblematic because of the movement. I have not found a suitable gimbal yet. At the moment some people in a German copterforum are designing a stiff and lightweight gimbal.

@Cadmium, I can not do that until halloween:-). I'm designing the new camera carrier.
Best regards,
Wilhelm

#31 nfoto

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Posted 28 October 2018 - 11:42

The Noflexar 35/3.5 has 49mm front thread.

#32 colinbm

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Posted 28 October 2018 - 13:12

View PostCadmium, on 26 October 2018 - 22:39, said:

I know this is off topic, even off board, so to speak, but this was done with drones, and I thought it was so beautiful, even the accompanying music, that I wanted to post it here.
https://youtu.be/ChnKSt4SbOI

Good one Steve....
I can just imagine this at Salisbury Plain & Stonehenge in the middle........
Cheers
Col

Edited by colinbm, 28 October 2018 - 13:13.


#33 Andy Perrin

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Posted 28 October 2018 - 14:44

You will probably be happy with the Noflexar. It is a really nice lens across the board. It weighs 198g to the Ennalyt's 132g, not sure if that makes much difference for you. I compared the images of the two lenses here:
http://www.ultraviol...dpost__p__22865

Edited by Andy Perrin, 28 October 2018 - 14:45.


#34 WiSi-Testpilot

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Posted 05 November 2018 - 15:52

Now the Noflexar 35/3.5 and the Exakta/Nex adapter arrived. Thank you again for your explanations. Otherwise I would have had not found the correct parts.
The parts look very good and I made a first comparative test with my pancake SEL20F28. Because I have no fitting filter adapter and the FOVs are different, I laid the filter in front of the lens and made images of the uniform grey November sky, both F/3.5. According to this first test the Noflexar is about one stop better than the pancake, see images. Therefore on the copter I will use the pancake, because it is much lighter, but I like the smaller FOV of the Noflexar. Of course I’ll repeat the test with the Venusfilter.

Noflexar 35/3.5
Attached Image: Noflexar35.jpg

SEL20F28
Attached Image: SEL20F28.jpg

Furthermore I have mounted the camera at another copter, see image. The distance between the tilt servo and the camera is a bit large. Therefore a few adjustments are to do. This version is more compact and easier to transport than the former setup. The shutter will be released via a Gentwire cable type 21MR. It allows also interval shooting.
Attached Image: LQ_A6K_CS_U.JPG

It's a bit off topic here, but in January 2017 I took a photo of a halo. While I was flying with the copter, a cloud moved in front of the sun, so that the appearance came out.
Attached Image: Halo_28_1_2017_verstaerkt.jpg

Best regards,
Wilhelm

#35 Cadmium

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Posted 05 November 2018 - 19:03

Wilhelm, That is a really nice setup you have there. Looks good!

#36 Andrea B.

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Posted 06 November 2018 - 21:10

Wow, I love that sun halo photo with the drone silhouette!
Andrea G. Blum
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#37 Øivind Tøien

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Posted 07 November 2018 - 10:50

View PostAndrea B., on 06 November 2018 - 21:10, said:

Wow, I love that sun halo photo with the drone silhouette!
+1 , the appearance of the drone in the image makes it even more special.
Øivind

#38 WiSi-Testpilot

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Posted 15 November 2018 - 19:15

@ Cadmium, Andra B. and Øivind Tøien.
Thank you for your kind remarks.

Drone Landing on the Earth

Attached Image: LQ_IR1_15_11_2018.jpg

Noflexar 35/3.5, F3.5, 1/60 sec., ISO 500
With the Green.L 950 nm Filter the Noflexar has no hot spot up to F16.
Best regards,
Wilhelm

#39 WiSi-Testpilot

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Posted 08 January 2019 - 08:40

I’m just soldering new electronic speed controllers (ESC) at one of my copters. The ESCs are the latest generation with sine-wave output and field-oriented control. Thereby I have taken a picture with the full spectrum camera and a thermal image of my soldering iron. The temperature was set to 350 degrees Celsius.
Best regards,
Wilhelm

Attached Images

  • Attached Image: Sinus_FOC_ESCs.JPG
  • Attached Image: Soldering_Iron_full_Spektrum_Alpha.JPG
  • Attached Image: Soldering_Iron_LWIR.jpg


#40 UlfW

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Posted 08 January 2019 - 16:18

It is very interesting that the soldering iron emit enough NIR to be seen by the full spectrum camera!
Ulf Wilhelmson
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