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Old Glass vs. New  Rating:  Rating
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Posted: Mon Apr 22nd, 2013 14:39
 
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Robert



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This was taken with D200 and Nikkor 55mm f2.8 Micro.

Attachment: Rudbeckia vis web a 3502.jpg (Downloaded 18 times)



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Posted: Mon Apr 22nd, 2013 14:42
 
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Robert



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Finally a UV fluorescence image, taken with a normal camera but in pure UV light at 365nM using a special Nichia high power UV LED.

The bright particles are probably pollen but some could be microfibres of manmade fabric, which fluoresce brightly in UV light.

Attachment: Rudbeckia UV Fl a web 3505.jpg (Downloaded 18 times)



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Posted: Mon Apr 22nd, 2013 14:54
 
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jk



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slrN is the Kodak slrN 14MP FF camera.



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Posted: Mon Apr 22nd, 2013 14:54
 
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Robert



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novicius wrote:
Ah that explains it , so then when the rear element is very close to the sensor there should be a hot spot , do not have that with the 55 f1.2 which has a rather large rear element very close to the sensor , have n`t noticed anything sofar , but then the slrN has no AA filter , which makes it susceptible to moir¨ tho`.


It's not so much the closeness, as how flat the rear element is, the Nikkor 50-1.4 has a very flat rear element, from my limited experiments that lens has about the flattest rear element I have seen and I believe that is the problem. This is another aspect of 'optimising for digital' Film doesn't reflect in the same way as the LPF.



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Posted: Mon Apr 22nd, 2013 14:57
 
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jk



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Robert wrote:
Finally a UV fluorescence image, taken with a normal camera but in pure UV light at 365nM using a special Nichia high power UV LED.

The bright particles are probably pollen but some could be microfibres of manmade fabric, which fluoresce brightly in UV light.



Robert please can you give more info on the UV image.
Camera and conversion details
Lens
Any filters
Light is the Nichia UV LED - i hav a similar one in a torch ;-)



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Posted: Mon Apr 22nd, 2013 14:59
 
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jk



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Vic I'll swap you my Nikon 50mm f1.8 AF for your 50mm f1.2 ;-)
Only one stop difference!



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Posted: Mon Apr 22nd, 2013 15:49
 
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Robert



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jk wrote:
Robert wrote:
Finally a UV fluorescence image, taken with a normal camera but in pure UV light at 365nM using a special Nichia high power UV LED.

The bright particles are probably pollen but some could be microfibres of manmade fabric, which fluoresce brightly in UV light.



Robert please can you give more info on the UV image.
Camera and conversion details
Lens
Any filters
Light is the Nichia UV LED - i hav a similar one in a torch ;-)


JK, That image above isn't a UV image taken in the UV spectrum, it's a Visible spectrum image, taken in pure UV light. You can reproduce this with almost any normal camera and your SpiderFire UV Torch, the wavelength will be a bit longer at about 385nM but it should still work OK.

My UV camera is a D200 with the LPF removed and replaced with a plain fluoride glass replacement. Here is an image taken with it using a Venus UV pass filter at 365nM. Back focus adjustment is about 21mm @ ~ 500mm using my Micro Nikkor 55mm f2.8, @ f2.8. Illuminated by a 3W UV LED with a home built adjustable Fluoride condenser lens.

The Micro Nikkor isn't Ideal it attenuates the UV too much. I am hoping to get an EL Nikkor about 70 or 80mm with a helix adaptor. The metal body EL lenses are best, they pass the greatest amount of UV because they are not coated.

From memory you have a 105mm bellows Nikkor, that may be OK because I don't think that has coated elements...

Same flower as above.

Attachment: Rudbeckia UV web a 97.jpg (Downloaded 16 times)



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Posted: Mon Apr 22nd, 2013 16:10
 
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Robert



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Vic, here is a composite image taken with two D1's, one normal the other IR converted @ 720nM and blended together. Bot using the same lens, but I forget which! LOL

Looking at it now the border needs toning down...

Attachment: Screen Shot 2013-04-22 at 22.06.36.jpg (Downloaded 15 times)



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Posted: Mon Apr 22nd, 2013 17:14
 
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novicius



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This one...

Attachment: slrn_front.jpg (Downloaded 15 times)



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Posted: Mon Apr 22nd, 2013 17:22
 
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novicius



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Had to ask my eldest son for help ,

Robert ,
those are FANTASTIC shots :applause:

Soon I will be able t` make a decision



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