Summary edit

Description2021-04-11 - Snail shell in comparison to pinhead - DSG4160-1 (magnif. ratio 3.0x).jpg	English: Comparison of a tiny snail shell of unknown genus to a blue glass pinhead. The snail shell is approx. 5.5 mm in diameter and is coated with miniscule sand and grit particles. A series of 132 images was processed as a focus stack. In addition to regular processing the luminosity of the shell's aperture was starkly enhanced to create an illusion of light emanating from within the snail shell.
Date	11 April 2021, 17:11:51
Source	Own work
Author	Franz van Duns
Taken with InfoField	This photo was taken with Sony ILCE-7RM4
Taken with InfoField	This photo was taken with Canon MP-E 65mm F2.8 1-5x Macro

Camera location	51° 28′ 48″ N, 7° 33′ 00″ E	View this and other nearby images on: OpenStreetMap	51.480000; 7.550000

NOTE: This image is a focus stacked image of "Comparison of a tiny snail shell to a blue pinhead" consisting of 132 images that were merged using Zerene Stacker Version 1.04 Build T2022-04-21-0715 (licensed). As a result, this image underwent digital manipulation which may have included blending, blurring, cloning, and colour and perspective adjustments. As a result of these adjustments, the image content may be slightly different than reality at the points where the images were combined. This manipulation is often required due to lens, perspective, and parallax distortions. العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ 日本語 ∙ македонски ∙ português do Brasil ∙ русский ∙ slovenščina ∙ ไทย ∙ українська ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−

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Additional Information edit

en: Comparison of a tiny snail shell to a blue pinhead.

• The snail shell is coated with miniscule sand and grit particles.
• The genus of the snail is unknown.
• The snail shell is approx. 5.5 mm in diameter.
  The magnification ratio, as taken with a full frame sensor, was set to 3.0x. i.e. 3.0:1.
• Focus stack derived from a total of 132 images, the lens being attached to a "Novoflex Castel-Micro" focusing rack and automatic stepper, advancing 0.0330 mm between images.
• In addition to regular processing the luminosity of the shell's aperture was starkly enhanced to create an illusion of light emanating from within the snail shell.
• Image series taken in Aplerbeck, Dortmund, Germany in April 2021.
  Had found this snail shell in our own garden, the pin is from my wife's handiwork kit.

See below for technical details concerning the "making of" this image.

Technical Details / Making of this Image edit

• Focus stacked image.
• [1] Camera: ILCE-7RM4: Sony Alpha 7RIV, 61 Mpixels, sensor size 9504x6336.
• [2] Lens: Canon MP-E 65mm f/2.8 1–5x Macro + Canon EF Adapter (Metabones Canon EF to Sony FE adapter), focal length 65.0 mm.
• [3] Scope: 132 images, initial magnification factor based on full sensor size before crop: 3.0:1 (3.0x) (see section {9} Final dimensions.
• [4] Camera / lens settings: manual mode, electronic shutter, ISO 100, 1/400s, aperture 3.2, bias (=exposure compensation) 0, WB (white balance) 5600K, BrightnessValue 6.61484375, colour space 'Adobe RGB'.
• [5] FOCUS STACK recording: camera attached to focusing rack / automatic stepper Novoflex Castel-Micro, step set to 0.0330 mm, resulting step 0.0330 mm, total distance covered 4.32 mm (from nearmost focus to the most distant focus spot), delay between images 8 sec., duration 19 min., took 132 images, both as JPG and 16-bit 'Adobe RGB' RAW (.ARW) files.
• [6] Adobe Lightroom: UNUSED.
• [7] FOCUS STACK processing: (a) tool 'Zerene Stacker' 1.04 (b) stacked all 132 JPG images via 'PMax' method (c) Stacking artefacts: SLIGHT (i.e. very little focus-based retouching required at this stage) (d) exported as one TIFF/16bit 'ProPhoto-RGB' image.
• [8] Adobe Photoshop: (a) imported stacked TIFF/16bit image, explicitly preserving embedded colour space 'ProPhoto-RGB' (b) removed sensor specks and visible specks of dust and strands (c) mask: YES: (c1) soft gradient, brightened up background (c2) added illumination radiating from within snail shell by cascading 3 soft-gradient masks (d) tone curve (main objects): 21>27, 71>123, 137>255 (e) enhanced sharpness: YES: 200, 1.0, 10 (f) rotated: NO (g) cropped: 9504x3802, but retained original width (h) saved as PSD file (i) exported as JPG max. quality file (6 of 7) with embedded 'sRGB' colour profile.
• [9] Final dimensions: width of image: approx. 12 mm, i.e. magnif. factor based on full frame approx. 3.0x.
• [10] ExifTool: added user-related tags and reimported technical tags that hat been discarded during Photoshop EXPORT-AS-JPG processing from both original .ARW and intermediate .TIF files.
• [11] Wiki Commons categorisation: Category:Sewing pins, Category:Snails of Germany.

Wiki Links edit

Wikipedia en: Land snail, Gastropod shell, Sewing pins

Wikipedia de: Schnecken, Schneckenhaus, Stecknadel

Licensing edit

I, the copyright holder of this work, hereby publish it under the following license:

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• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

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• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

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