panorama 390>800 nm

[photoni]

Yesterday in Verona it was very hot, more than 37°
I went to the hills 40 km from home the height is about 800 asl to walk in the woods in the fresh.
I brought a stand, my Sony A7 f.s. a Nikkor 24 mm f 2.8 (not good for UV but good for IR) using aperture 8.

the photos in sequence are:
VIS - colors (TSN)
UV (~390nm TSN+ZWB2)
VIS-BW
Light green
Orange (~530 nm)
Red (~590nm)
R72 (~720nm)
Wratten 87 (~750 nm)
Wratten 87c (~800 nm)

 

All images are processed with Capture One Desaturated 100% Brightness and contrast to my taste

 

I'm surprised by the green filter, which I used for black and white film, it removes a lot of haze and is very three-dimensional.

I'm surprised by the IR filters, the result is very similar

¿ I wonder if it is worth buying an 850 or a 950 nm?

 

Thanks

Antonio

 

 

[ulf]

3 minutes ago, photoni said:

I'm surprised by the green filter, which I used for black and white film, it removes a lot of haze and is very three-dimensional.

I'm surprised by the IR filters, the result is very similar

¿ I wonder if it is worth buying an 850 or a 950 nm?

 

Thanks

Antonio

Green filters often have a very good transmission of NIR. They mainly block the red parts of the spectrum. As the converted camera has a high sensitivity in NIR you get a haze removal effect, without the blackening of the sky.

The difference of the IR-filters after desaturation is mainly the darkness of the sky and the exposure time.

A 850nm filter will be close to a Wratten 87c.

A 950nm filter gives almost identical images as the 850nm filter, but with much longer exposure times. That can be nice if you are looking for smoothing out movements like running water. A 950nm is a bit like a 850nm filter+ a ND filter.

[photoni]

6 minutes ago, ulf said:

20 minutes ago, photoni said:

Green filters often have a very good transmission of NIR. They mainly block the red parts of the spectrum. As the converted camera has a high sensitivity in NIR you get a haze removal effect, without the blackening of the sky.

Thanks

 

basically does the opposite of a ZWB3 ~ UG5 filter :-)))

[photoni]

this UV+VIS+IR is interesting

 

 

 

.

 

 

[Andrea B.]

Interesting about the green filter. I'd never thought of that.

 

Toni, I really like your stack. That is very striking.

 

This might be useful to some members: UV landscape photos (such as Toni's 2nd photo above) are also often quite nice when processed using a split-toning method.

[photoni]

On 7/17/2023 at 11:18 AM, ulf said:

Green filters often have a very good transmission of NIR. They mainly block the red parts of the spectrum. As the converted camera has a high sensitivity in NIR you get a haze removal effect, without the blackening of the sky.

.

I don't have the Vivitar light green filter transmission graphs, but as I put in another post the spectrometer graphs see green which cuts only the deepest part of the blue and violet, the IR part is only partially suppressed.
It amazes me that the foliage is so dark.

Thanks

.

[lukaszgryglicki]

Hoya green x0 filter is great on a full spectrum camera, it seems to pass mostly green in the visible spectrum but then opens in IR and allows very colorful photos.

 

[dabateman]

If you look in this publication,  many green filters on the market have different spectrum.  Some from same manufacturer,  only difference was size of filter, where different. 

So generally statements can be tricky. 

Foveon_greenfilter_Aerochrome.pdf

[photoni]

Hills of Verona 2023-11-22

 

All with Sony A7 FS and Meritar 50 mm ~ f8

 

.  Hoya R72

 

.  Hoya R72

 

.  Hoya R72 - RED - GREEN

 

. HOYA R72 - RED - GREEN

 

.  Hoya R72 - 3 photos merged

 

.  Hoya R72

.

[colinbm]

Something is wrong Toni ?
Some look like they were taken with a web cam & blown up too big ?

[photoni]

8 hours ago, colinbm said:

Something is wrong Toni ?
Some look like they were taken with a web cam & blown up too big ?

 

I probably developed the photos too small to stay in the recommended format <2000 pixels
...and I put the unsharp mask too strong for this format

.

this is a crop - 100% panorama of 16000 pixels

Meritar is good but non a new planar lens

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