Gazania rigens: human vision vs simulated bee vison using a quartz singlet lens for reflected UV ultraviolet photography (III)

This is a 3rd set of shots with the same flower Gazania rigens flower that I have shot previously with a quartz-fluorite lens and the same setup as in shots before using a custom made up UV lens from a simple quartz singlet, stopped down to around f16 (estimated as no scale). Shots are in normal human vision VIS, in UV using the Baader-U and Jupiter-U filter, as well as in simulated bee vision using my XBV2 and XBV3 filters respectively. Flower placed into the center, higher magnification, otherwise unchanged setup as before.

[click on image to see a larger one]

Visual shot:


Simulated bee vison using XBV3 filter:


Simulated bee vison using XBV2 filter:


Simulated bee vison using XBV5 filter:


UV using Baader-U filter:


UV using Jupiter-U filter:


I haven't re-adjusted the UV focus, so the rear of the flower drifts into blur, that could be avoided, if so wanted by individually adjusting focus for each shot.

I used a 365nm UV LED for focusing, that worked pretty well, even stopped down that much.

In my opinion this central placement is the best way to use this lens singlet, as it minimizes the visible blur, yet delivers acceptable sharpness in that whole spectral range.


Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos

Gazania rigens: human vision vs simulated bee vison using a quartz singlet lens for reflected UV ultraviolet photography (II)

This is a 2nd set of shots with the same flower Gazania rigens flower that I have shot previously with a quartz-fluorite lens and the same setup as in shots before using a custom made up UV lens from a simple quartz singlet, stopped down to around f16 (estimated as no scale). Shots are in normal human vision VIS, in UV using the Baader-U and Jupiter-U filter, as well as in simulated bee vision using my XBV2 and XBV3 filters respectively.

[click on image to see a larger one]

Visual shot:


Simulated bee vison using XBV3 filter:


Simulated bee vison using XBV2 filter:


Simulated bee vison using XBV5 filter:


UV using Baader-U filter:


UV using Jupiter-U filter:


The idea behind that 2nd set was to get a better estimate of the VIS-UV focus shift (measured 5.8%, VIS is quite larger) as well as to show the effect of out-of-center imaging, to get an idea how the blur develops. I guess that gets pretty clear now.


Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos