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Meeting 2

2025-05-06

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News

photo

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Nikon Z5 II

25 MP BSI full-frame

in-body image stabilisation (IBIS)

700 g

weather-sealed

€ 1,899

​

product page

​

Photo News

cameras

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Nikon Z5 II, € 1,899 – alternatives

Nikon Z6 III: 25 MP stacked – € 2,099

Nikon Z6 II: 25 MP BSI – € 1,419

Sony A7 IV: 33 MP BSI – € 1,999

Photo News

cameras

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Sigma BF “Beautiful Foolishness”

25 MP full-frame

L-mount

no mechanical shutter (!)

no IBIS

230 GB internal storage - no card slot

€ 2,339

product page

Photo News

cameras

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Sigma BF vs Panasonic LUMIX S9

same sensor

+ IBIS, card slot, articulated screen, better battery life, pixel shift, focus-bracketing, hot shoe, better AF

- weather sealing, div. video settings

€ 2,339 vs € 1,189

​

Photo News

cameras

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Fujifilm GFX 100RF

large 100 MP 44 mm x 33mm sensor

very compact (735 g)

no IBIS

35 mm f/4.0 (28 mm f/3.2 full-frame equiv.)

leaf shutter

€ 5,499

Photo News

cameras

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Fujifilm GFX 100RF

+excellent high-res sensor, size and weight

-requires cropping to change FOV, �lens needs software correction, no IBIS

product page

Photo News

cameras

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Fujifilm GFX 100RF, € 5,499 – alternatives

Fujifilm GFX 100 SII, € 5,490

Hasselblad X2D 100C, € 8,699

​

both have IBIS but need a lens

Photo News

cameras

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Viltrox AF 35mm F1.2 LAB

Sony E mount

LCD – very unusual for 3rd party lens

USB-port in the lens mount

very promising reviews

€ 1,099

​

product page

Photo News

lenses

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Zeiss Otus lenses now also for mirrorless

Zeiss Otus ”ML” series for Canon RF, Nikon Z and Sony E mount. �available lenses:

50 mm f/1.4 - € 2,260

85 mm f/1.4 - € 2,799

product page

Photo News

lenses

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Sony FE 50-150 F2 GM

extremely fast full-frame zoom

on APS-C => 75-225 mm f/3 full-frame equiv.

aperture ring

€ 4,399

​

product page

Photo News

lenses

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Sony FE 400-800mm 6.3-8 G OSS

first 800 mm zoom lens since 2002 (!)

Sony E-mount

2.5 kg

€ 2,999

​

product page

Photo News

lenses

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Sigma Sports (S) 300-600mm 4.0 DG OS

f/4.0 zoom (!) + optical stabiliser

replaces primes (300-600 + TC)

L-mount + Sony E-mount

3.9 kg (!)

€ 6,990

product page

Photo News

lenses

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Sigma Sports (S) 300-600mm 4.0 DG OS

28 elements, 21 groups

3.9 kg - € 6,990

​

Canon FD 600mm 4.5 S.S.C. - 1976

6 elements, 5 groups

4.3 kg

€ 8,800 – € 10,500 (inflation-adjusted)

​

Photo News

lenses

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Sigma Sports (S) 300-600mm 4.0 DG OS

28 elements, 21 groups

3.9 kg – € 6,990

​

Sony FE 600mm 4.0 GM OSS

24 elements, 18 groups

3 kg – € 13,999

​

Photo News

lenses

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Sigma Sports (S) 300-600mm 4.0 DG OS - alternatives

​

no lens with similar specs on the market

Photo News

lenses

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Zhongyi Optics 55mm f/2.8 1-5x

working distance: 150–65 mm (1-5 x)

mounts: Nikon F+Z, Pentax K, Sony E, Canon RF+EF, Panasonic L, Fuji X+GFX, Hasselblad XCD, MFT

​

Zhongyi is not known for its good macros but very interesting lenses

product page

Photo News

lenses (rumors)

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Zhongyi Optics 55mm f/2.8 1-5x

alternatives

Laowa 25mm f/2.8 2.5-5x – € 449�shorter focal length, great image quality

Canon MP-E 65mm f/2.8 1-5x – € 800 (used)�discontinued, chromatic aberration

Photo News

lenses (rumors)

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Nikon NX Studio 1.9.0

support for Z5II

Nikon ID

some issues fixed

​

download

Photo News

software

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Nikon NX Tether 2.3.0

support for Z5II

support for pixel shift

saving power zoom positions

​

download

Photo News

software

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Archiving 2025

24-27 June 2025

Granada (Spain)

​

all aspects of imaging, digitisation, archiving

Photo News

conferences

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33rd Color & Imaging Conference

27-31 October 2025

Hong Kong (China)

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all aspects of colour capture, processing, reproduction and perception

Photo News

conferences

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News

IBM

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Metashape 2.2.1

menu rearrangements

snapping (drawing)

COLMAP export

auto-resume after crash

Mars & Moon CRS

​

download

IBM News

software

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CIPA Symposium 2025

25-29 August 2025

Seoul (Republic of Korea)

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from digital documentation

to data-driven heritage conservation

IBM News

conferences

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ISPRS WG II/7

08-11 July 2025

Vienna (Austria)

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3D underwater mapping from above and below

IBM News

conferences

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Digital Heritage 2025

08-13 September 2025

Siena (Italy)

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culture meets cutting-edge technology

IBM News

conferences

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Asmus, B., Fera, M., Mödlinger, M., 2025

Deconstructing Barisanus' medieval casting technology based on digital twins. Scientific Reports 15 (1), 7419.

​

DOI: 10.1038/s41598-025-91168-9

IBM News

papers

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Tsairis, G., Alexopoulou, A.G., Zacharias, N., Kakoulli, I., 2025

Close-Range Photogrammetry and RTI for 2.5D Documentation of Painted Surfaces: A Tiryns Mural Case Study. Coatings 15 (4), 388.

​

DOI: 10.3390/coatings15040388

IBM News

papers

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Krojer, S., 2025

Moderne unterwasser-archäologische Prospektion und Dokumentation am Anwendungsbeispiel Attersee und Mondsee. Master thesis, Vienna, xvi, 317.

IBM News

thesis

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Presentation

RTI & PTM

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RTI & PTM

what ?

techniques for relightable images

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RTI & PTM

what ?

techniques for relightable images

​

Reflectance Transformation Imaging

  • computational photography
  • tens of object photos from fixed camera position while moving directional light around

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RTI & PTM

what ?

techniques for relightable images

​

Reflectance Transformation Imaging

  • computational photography
  • tens of object photos from fixed camera position while moving directional light around

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RTI & PTM

what ?

techniques for relightable images

​

Reflectance Transformation Imaging

  • computational photography
  • tens of object photos from fixed camera position while moving directional light around

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RTI & PTM

what ?

techniques for relightable images

​

Reflectance Transformation Imaging

  • computational photography
  • tens of object photos from fixed camera position while moving directional light around
  • compute per-pixel reflectance
  • users can virtually relight object

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RTI & PTM

what ?

techniques for relightable images

​

Reflectance Transformation Imaging

  • computational photography
  • tens of object photos from fixed camera position while moving directional light around
  • compute per-pixel reflectance
  • users can virtually relight object

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RTI & PTM

what ?

Polynomial Texture Mapping

  • 2001 @ Hewlett-Packard Labs
  • particular RTI reflectance model
  • first model, others followed

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RTI & PTM

what ?

Polynomial Texture Mapping

  • 2001 @ Hewlett-Packard Labs
  • particular RTI reflectance model
  • first model, others followed

​

all PTMs = RTIs

all RTIs ≠ PTMs

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RTI & PTM

what ?

Polynomial Texture Mapping

  • 2001 @ Hewlett-Packard Labs
  • particular RTI reflectance model
  • first model, others followed

​

all PTMs = RTIs

all RTIs ≠ PTMs

​

terminology used interchangeably

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RTI & PTM

why ?

  • re-lighting
  • mathematical enhancement

​

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RTI & PTM

why ?

  • re-lighting
  • mathematical enhancement
  • great for revealing surface details
    • inscriptions
    • coin surfaces
    • tool marks
    • brushstrokes

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RTI & PTM

why ?

  • re-lighting
  • mathematical enhancement
  • great for revealing surface details
    • inscriptions
    • coin surfaces
    • tool marks
    • brushstrokes

​

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RTI & PTM

why ?

  • re-lighting
  • mathematical enhancement
  • great for revealing surface details
    • inscriptions
    • coin surfaces
    • tool marks
    • brushstrokes

​

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RTI & PTM

why ?

  • re-lighting
  • mathematical enhancement
  • great for revealing surface details
    • inscriptions
    • coin surfaces
    • tool marks
    • brushstrokes
  • 3D 🡪 not for large undulations
  • no drawing tools (!)

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

​

  • methods
    • highlight-based
      • flash at fixed distance
      • needs reflective spheres

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

​

  • methods
    • highlight-based
      • flash at fixed distance
      • needs reflective spheres
    • dome-based method

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

​

  • methods
    • highlight-based
      • flash at fixed distance
      • needs reflective spheres
    • dome-based method

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

​

  • methods
    • highlight-based
      • flash at fixed distance
      • needs reflective spheres
    • dome-based method

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

​

  • compute per-pixel reflectance
    • Relight (replaces RTIBuilder)

​

​

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RTI & PTM

how ?

Relight

  • supports
    • highlight-based method
    • dome-based method
  • opens legacy formats “.rti” & “.ptm”
  • new format: “.relight”
  • 6 mapping algorithms

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RTI & PTM

how ?

  • tens of object photos
    • from fixed camera position
    • while moving a directional light

​

  • compute per-pixel reflectance
    • Relight (replaces RTIBuilder)

​

  • visualise
    • RTIViewer
    • Relight

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RTI & PTM

more info

CHI website

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RTI & PTM

more info

CHI website

​

Publication Historic England

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Tips & Tricks

photo

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Photo Tip

keeping it dry

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Photo Tip

keeping it dry

Protection from

  • fungus
  • oxidation (contacts and circuit boards)
  • issues with lubricants in helicoids and shutter mechanism

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Photo Tip

keeping it dry

How? D.I.Y. dry packs

  • silica gel bought in bulk or collected from packets
  • air-permeable container
  • color indicators show saturation
  • “recharge” silica gel at low heat in the oven for a few hours
  • ideal for backpacks in wet climates or long-term (sealed) storage

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Tips & Tricks

IBM

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IBM Tip

Metashape

  • ° Metashape 2.2 (April 2025)
  • “Save project after each step”
  • auto-resume after
    • crash
    • shut down
    • system freeze
  • add ~3-5 % to project size

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proposals ?

Next Meeting

2025-06-04

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Meeting 2

2025-05-06