Schlumbergera truncata [Zygocactus]

[cazza132]

Last, Initial or Name (2021) Schlumbergera truncata (Cactaceae) Zygocactus. Flowers photographed in ultraviolet, infrared and visible light. Also UV-induced visible fluorescence photo. LINK

 

Location:

03 June 2022

Australia

House Plant

 

Synonyms:

• several -- see Reference

 

Other Common Names:

• Christmas Cactus
• False Christmas Cactus

 

Comment:

Finally received my Canon R5 (full spectrum modified by Kolari) and decided to try it out on a blooming Zygocactus (Schlumbergera truncata).

Used a EL-Nikkor 105mm f/5.6 for all shots.

The following was taken outside in shade.

Very happy with results so far :)

 

Reference:

1. Wikipedia (05 June 2022) Schlumbergera truncata. Wikimedia Foundation, San Francisco, CA.

 

Equipment:

• Converted Canon EOS R5
• EL-Nikkor 105/5.6

 

First shot - UV with Baader U.  ISO100, 13sec, f/11.  There is a bit of a green patch likely from light leak.  +1.00EV & click WB on right flower in post.

 

UV with Kolari UV Bandpass.  ISO100, 13sec, f/11, +0.33EV & click WB on right flower in post.

 

Visible light with Kolari hot mirror (second gen). ISO100, 1/25th sec, f/11, OOC (AWB) white balance.

 

Infrared with 650nm longpass filter. ISO100, 1/30th sec, f/11.  I could have boosted the contrast, but decided to keep the original OOC settings.

 

Kolari IR Chrome. ISO100, 1/30th sec, f/11.  Probably a bit too much green cast with white balance.

 

 

Also, see below:

 

https://www.ultravioletphotography.com/content/index.php?/topic/5406-schlumbergera-truncata-zygocactus/&do=findComment&comment=56597

 

https://www.ultravioletphotography.com/content/index.php?/topic/5406-schlumbergera-truncata-zygocactus/&do=findComment&comment=56681

 

[colinbm]

Such a beaut flower.

[cazza132]

Followed up with some night time work with two modified Yongnuo YN560 IV flashes, 365nm & 395nm torches, and a visible light torch.

 

Baader U.  Flashes with ZBW1 (~UG11) cover filters. ISO100, 60sec, f/8.  Flashes fired 6 times at full power. +0.5EV post

 

Kolari UV Bandpass.  Flashes with ZBW1 (~UG11) cover filters. ISO100, 60sec, f/8.  Flashes fired 5 times at full power. +0.83EV post

 

Kolari UV Bandpass.  365nm LED torch. ISO100, 3.2sec, f/8.

 

UVIVF with Kolari UV/IR cut filter. 365nm LED torch. ISO100, 20sec, f/8.

 

UVIVF with Kolari UV/IR cut filter + Hoya X0 (yellow green) lens filter. 395nm LED torch. ISO100, 20sec, f/8. +1.17EV post

 

Visible light - white LED with Kolari Hot Mirror (Gen 2)

 

UVIIF with 630nm long pass filter on lens.   365nm LED torch. ISO100, 30sec, f/8. +1.83EV post

 

Infrared 650nm with white LED torch.  ISO100, 10sec, f/8. +1.50EV post

[colinbm]

Terrific, cazza132

[cazza132]

3 minutes ago, colinbm said:

Terrific, cazza132

Thanks Colin! Some cool flowers alright.  Thought the 395nm UVIVF & 365nm UVIIF came up pretty wild!

[Nate]

Great shots! That UVIIF is excellent. Just curious, is 630nm the way to go for those, or can you use a 590 or 720?

[cazza132]

40 minutes ago, Nate said:

Great shots! That UVIIF is excellent. Just curious, is 630nm the way to go for those, or can you use a 590 or 720?

Thanks Nate! It would be interesting. I will try that next time. I suspect 590 would be similar to 630 & 642nm I've tried before because there isn't a lot showing up in the green/yellow with 365nm UVIVF - except for the pollen. 720nm would tend to monochrome as it does for general infrared. Red chlorophyll fluorescence is already in play - at about 690nm I think. Dual band Tiffen 11 green or IR Chrome would also be interesting - I haven't tried those yet.

[dabateman]

I like these. You're at a great start with the new camera. 

[Andy Perrin]

Gorgeous. 
 

Note: this is in one of the formal sections, so the post probably needs to be reformatted to meet the standardized format. Or Andrea can probably move it to an informal section for you. 

 

Bear in mind that in UV, a white flower in visible light will not remain wavelength-neutral (“UV-white”), so taking a white balance off the vis-white petals can leave a color cast generally. Best to always use PTFE/Teflon as a WB target for technical work. 
 

 

[photoni]

@cazza132 a great demonstration, bravo!

[cazza132]

On 6/4/2022 at 4:01 PM, Andy Perrin said:

Gorgeous. 
 

Note: this is in one of the formal sections, so the post probably needs to be reformatted to meet the standardized format. Or Andrea can probably move it to an informal section for you. 

 

Bear in mind that in UV, a white flower in visible light will not remain wavelength-neutral (“UV-white”), so taking a white balance off the vis-white petals can leave a color cast generally. Best to always use PTFE/Teflon as a WB target for technical work. 
 

 

Thanks for the heads up Andy - I will keep that in mind for next time.  I had a quick go today and used a PTFE WB target with the following result.

On 6/4/2022 at 4:47 PM, photoni said:

@cazza132 a great demonstration, bravo!

Thank you photoni!

[colinbm]

Looks good caszza132
Be careful with the PTFE it will over-expose if in the full sun.

[Andy Perrin]

Looks very good, and yes, the PTFE improved the colors. The blacks look untinted now, for example. I think that's the way to go. Honestly all these pics are wonderful and I'm enjoying.

[Andrea B.]

Nice work, Cazza. I'll take care of some formatting for you. Then you can copy/paste it for reuse in the future. 

 

Cazza -- would you please try out the IR LED test on your modded R5? I would like to be able to say that the R5 does not have the IR LED problem. Thank you.

LINK to TEST:  

BASIC TEST for IISM CONTAMINATION &/or LIGHT LEAKS in CAMERA BODY

[cazza132]

On 6/6/2022 at 5:20 AM, Andrea B. said:

Nice work, Cazza. I'll take care of some formatting for you. Then you can copy/paste it for reuse in the future. 

 

Cazza -- would you please try out the IR LED test on your modded R5? I would like to be able to say that the R5 does not have the IR LED problem. Thank you.

LINK to TEST:  

BASIC TEST for IISM CONTAMINATION &/or LIGHT LEAKS in CAMERA BODY

Thank you Andrea.  I will make sure to use the template next time.

 

I have just posted my IR led tests on both my modded full spectrum Canon 6Ds (one with clear sensor filter replacement & one with 'naked sensor' (no filter replacement)), and the new Canon R5.