Using the Micro-Nikkor 105 f4 with the bellows 105mm f4

[Erik Lund]

Seapy, I completely agree!

[Seapy]

Thank you Erik. 

[Bent Hjarbo]

Seapy, I completely agree!

+1
Would  be interesting if someone could measure the spectrum of the IKEA lamp, some of IKEAs other LED lighting has good ra values, so maybe this cheap lamp could be ok.

[Erik Lund]

I'm sure someone like Klaus will hook it up and check just for fun, but be prepared to be disappointed

[Bent Hjarbo]

Did a Google search, but did not find anything, let us hope that Klaus can do it

[Seapy]

Thanks Bent,  I have to go out now won't be back till later tomorrow.

One thought I have had is to buy a light splitting prism, they are on eBay cheap enough as educational items, to project the light from these and other lamps through the prism then photograph it close up and framed on just the projected light.  The resulting histogram may tell a story?

[Akira]

Deleted: my reply was totally out of point.

[Bent Hjarbo]

Thanks Bent,  I have to go out now won't be back till later tomorrow.

One thought I have had is to buy a light splitting prism, they are on eBay cheap enough as educational items, to project the light from these and other lamps through the prism then photograph it close up and framed on just the projected light.  The resulting histogram may tell a story?

Might be a way, I photographed a piece of white paper illuminated by the Jansjö, can get a perfect white picture in LR using the auto functions, but I don’t think it is the right way

[Seapy]

this morning I have ordered a light splitting 60-60-60º by 100mm long prism which I should have by Wednesday, I will run some experiments with different light sources to see what happens.

I think I may have to make a box to exclude stray light to prevent it from confusing the issue.

I am hoping this will reveal any gaps in the spectrum, I am also wondering if some sort of holder to mount on the front of a lens might be useful to project the split light rays through the lens to focus on the D3 sensor, perhaps a lens isn't needed?  That way the histogram or levels in photoshop may give a clear defined reading of the intensity of the various colours.  Probably not scientific but a reasonable indication of the spectrum I hope.

Could use sunlight and a flash gun for reference.

[Bent Hjarbo]

Interesting, looking forward to the result.
I have considered to get/loan a painters colour patches and photograph them in different lightning.

[Bent Hjarbo]

I just loaned a painters color scheme from my neighbor.
I made a rough setup, indoor in a black box with the Jansjö lamp, outdoor in todays overcast weather.
The shiny coating on the parches makes them more bright in the indoor setup.
The idea is to se if the all the colors are recorded.
Pictures taken with my Df and a AFD 24mm f2.8 @f11

[Bent Hjarbo]

And then the sun came

[Seapy]

Interesting, need to put the colours from each type of lighting next to each other for comparison, I am really keen to see the analysis of the light.

Running the two different approaches together seems to me to be a very good idea.  It would be very good if somebody with technical understanding, like Klaus could do a proper analysis of these different light sources as well.  That would clinch it.

Also maybe photographing a nice flower or flowers under different lighting too.

[Bent Hjarbo]

Maybe we should start a thread about lightning quality?

[Seapy]

Yes, I'm sorry, have taken this thread way OT.

When I get the prism I will start a new thread.