Some multispectral London scapes

[Timber]

My first multispectral tries. Unfortunately the lenses I've used have quite a big focus shift, and the weather was quite windy, so not as good as I hoped for... but I still quite like them :D

 

Equipment: Sony NEX 6 with Spectrosil 2000 Fused Silica Gel, E. Ludwig Meritar 50mm f2.9 & RMC Tokina 28 f2.8 lenses

Filter: UV: Hoya U360 2mm + Schott BG40 2mm, VIS: Schott BG40 2mm, IR: Zomei (LOL) 950

Light Source: Sunlight, windy and cloudy day

Converter: UV and IR converted to B&W in Lightroom and then the 3 image stacked together in Photoshop. IR - Red, VIS - Green, UV - Blue, Luminosity was given by the IR shot most of the time.

 

http://clancode.hu/!uv/multi1.jpg

 

http://clancode.hu/!uv/multi2.jpg

 

http://clancode.hu/!uv/multi3.jpg

 

http://clancode.hu/!uv/multi4.jpg

 

http://clancode.hu/!uv/multi5.jpg

[Andrea B.]

Love the last one. It is also a temporal stack, one of my favorites kind of stacks. "-)

[JCDowdy]

That is a neat observation!

Now that you called attention to it, looking closely they all have a bit of temporal stacking.

[nfoto]

Cannot be avoided to include the temporal dimension when filters have to be shuffled around manually :)

[JCDowdy]

The clock shows it was done rather spritely

[nfoto]

Timber is evidently a fast operator and an accomplished filter swapper :)

[Timber]

I always started with the VIS image (BG40) so then I only have to put the UV pass (U360) for UV shot. Then just swap them with the IR (Zomei IR950)... The Big Ben was actually a slow one as I had to wait for the traffic too. I'd say each stack took roughly 2 minutes.

[Andrea B.]

It's the moving people which are great fun in the last photo.

 

There was a fellow I haven't heard from in a long time who made some lovely software for multi-spectral stacks. It could quite crank them out in amazing variations. Super cool !!!

 

See Ben Lincoln's Detailed Into to Multispectral Photography and Uses of Multispectral Photography

[Andrea B.]

Forgot the link to the software itself by Ben Lincoln: http://www.beneaththewaves.net/Software/The_Mirrors_Surface_Breaks.html

[Timber]

Thanks Andrea... it was an interesting read!

As of now I don't have a beam splitter and I am not sure if I am planning to invest in one in the near future (yet I would love to take it to Philippines next year) so I think I am stick to the temporal ones... all I can do is perfecting my filter swapping technique... maybe one day I can get so quick it will be almost beam splitter like :)

[Andrea B.]

I though you might also enjoy the software which does the stacking. "-)

[Alex H]

... I can get so quick it will be almost beam splitter like :D

 

Filter wheel?

[Timber]

Filter wheel?

naaah... that's cheating!

 

Actually I only have 67mm filters atm... 1 BG40, 1 U360, 1 IR720, 1 IR950. Finding a filter wheel this size is impossible and would be huge so I'd be afraid that MET will stop me because they mistake it for a Tommy gun :D

 

Sooner or later I will try beam splitting (and that time I will keep bombarding you with questions :D), until then I enjoy the colorful people and cars :)

[cmoody]

One thing we're looking at is "Xume filter adapters". They're magnetic filter rings. Provided they are secure enough, it could facilitate swapping between a visible and UV filter quite nicely and quickly!Annoyingly there are only a few different diameters available :D

[Andrea B.]

Those Xumes do look interesting.

 

But I would fear that the magnetic "clonk" of attaching such a filter would upset any preset focus or camera angle in those cases where I was trying to make "matching" UV/Vis/IR photos for multispectral stacks. Of course for other work, that wouldn't matter.

 

Some of us used to use old Nikon A-type filter holders similar to this: http://www.bhphotovi...s=REG&A=details

The old one had an internal ring for screwing in round filters.

We would hand mount the Visible filter on the lens, make the shot, remove filter and then flip up the UV filter which was permanently mounted in the holder. At least this gave one quickly mounted filter.

[OlDoinyo]

If you want real simultaneity, you could use a multi-camera rig with a common trigger, perhaps something like J.W. Wong's beamsplitter box, which has no parallax:

 

https://www.flickr.com/photos/jw_wong/4704529569/

[Alex H]

J.W. Wong's rig only takes two pictures, while these are three-shot composites.