The Bausch & Lomb f4.5 / 9" (229mm) lens for reflected UV II

Quite a few years ago I got an older lens, which was made many years ago by famous lens maker Bausch & Lomb, Rochester NY. It is a golden color coated, heavy and well made f4.5 / 9" (229mm) Phosphor lens which attracted me, since it was made to record images displayed by a P-16 phosphor screen. Nothing special actually, but since P-16 phosphor emits at about max. 380nm, that attracted me most for my UV work.

 

A while ago I tested it against the Coastal Optics Micro Apo 105mm and the Nikon UV Nikkor 105mm and it perfomed very well.

[click on image gets you a larger image]

The spectrometric results in comparison to the Kuribayashi 3.5/35mm lens, one of the best performing "normal" lenses for UV reveals that is very useful for reflected UV:



The B&L lens has a very high UV performance, at 365nm it transmits 74%, whereas the Kuribayashi has 80%, so very close to it. A very useful long focal length lens for reflected UV with quite high UV transmission and reaching rather deep into the UV range for a non quartz fluorite lens.

So and here a few shots I took the other day with it, first the roof of the neighbour house about 20 meters away:

Then a Rudbeckia hirta flower on my balcony from about 4 meters away:

It is indeed a rather sharp lens for reflected UV, which allows a nice working distance, if so needed. A good addition to the rare tools for reflected photography!

I have written HERE more about it.

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

The Bausch & Lomb f4.5 / 9" (229mm) lens for reflected UV

Quite a few years ago I got an older lens, which was made many years ago by famous lens maker Bausch & Lomb, Rochester NY. It is a golden color coated, heavy and well made f4.5 / 9" (229mm) lens which attracted me, since it was made to record images displayed by a P-16 phosphor screen. Nothing special actually, but since P-16 phosphor emits at about max. 380nm, that attracted me most for my UV work.

 

A while ago I tested it against the Coastal Optics Micro Apo 105mm and the Nikon UV Nikkor 105mm and it perfomed very well.

[click on image gets you a larger image]

Today now the spectrometric results in comparison to the Kuribayashi 3.5/35mm lens, one of the best performing "normal" lenses for UV:



It gets pretty clear that the B&L lens has a very high UV performance, at 365nm it transmits 74%, whereas the Kuribayashi has 80%, so very close to it. A very useful long focal length lens for reflected UV.

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

Lens Comparison: UV Nikkor 105mm, COSI 105mm, B&L 9"

Today I got an old lens, which was made many years ago by famous lens maker Bausch & Lomb, Rochester NY. It is a golden color single coated, heavy and well made f4.5 9" lens which attracted me, since it was made to record images emitted by a P-16 phosphor screen. Nothing special actually, but P-16 radiates at about max. 380nm, so now you know what attracted me most...

I ran a quick test using my "standard test subject", a roof of the neighbours house against the Coastal Optics Micro Apo 105mm and the Nikon UV Nikkor 105mm. The B&L lens results are shown on the right side of the comparison images. The B&L images have been scaled down to match the shorter focal length of the other two lenses. These are 100% center crops. The Baader U-filter (310 - 390nm) was used for the reflected UV shots. [click on image gets you a larger image]

Here the results in visible light for the UV Nikkor (left):




and for the Coastal Optics 105mm (left):




Here the results in reflected UV light using the Baader U-Filter (310 - 390nm) for the UV Nikkor (left):




and for the Coastal Optics 105mm (left):




So now it is up to you to understand my surprise, how amazingly sharp this B&L lens is....

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