Summary edit

DescriptionDetail of spider (Dysdera crocata) with secretions between massive chelicerae - DSG1941-1 - 2022-11-08 (magnif. ratio 2.8x, HiRes).jpg	English: Enlarged frontal view of a spider (genus Dysdera crocata) set on a layer of moss with outstretched legs. This image shows the spider's body, its 6 eyes in a compact hexagonal arrangement, the inner parts of all 8 legs, the pedipalps, and the massive chelicerae with strands of secretions stretched between. The magnification ratio of this crop as compared to a full frame sensor is approx.2.8:1, i.e. 2.8x; the width of the image being approx. 13 mm. A total of 293 images was processed as a HiRes focus stack.
Date	8 November 2022, 11:19:10
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 "Enlarged frontal view of a spider (genus Dysdera crocata)" consisting of 293 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: Enlarged frontal view of a spider (genus Dysdera crocata).

• This arthropod is set on a layer of moss with legs outstretched .
• This image displays the spider's body, its 6 eyes in a compact hexagonal arrangement, and the inner parts of all 8 legs
• One of its pedipalps is concealed by its foremost leg and the massive pointed chelicerae are connected by strands of secretions stretched between.
• The magnification ratio of this crop as compared to a full frame sensor is approx.2.8:1, i.e. 2.8x; the width of the image being approx. 13 mm.
• Focus stack derived from a total of 293 images, the lens being attached to a "Novoflex Castel-Micro" focusing rack and automatic stepper, advancing 0.08 mm between images.
• Very high resolution: all across the image both body parts and bristles are resolved in fine detail.
• Image series taken in Aplerbeck, Dortmund, Germany in November 2022.

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: 293 images, initial magnification factor based on full sensor size before crop: 1.5:1 (1.5x) (see section {9} Final dimensions...).
• [4] Camera / lens settings: manual mode, electronic shutter, ISO 100, 1/40s, aperture 4.0, bias (=exposure compensation) -0.7, WB (white balance) 5600K, BrightnessValue 3.7125, colour space 'Adobe RGB'.
• [5] FOCUS STACK recording: camera attached to focusing rack / automatic stepper Novoflex Castel-Micro, step set to 0.0800 mm, resulting step 0.0800 mm, total distance covered 23.36 mm (from nearmost focus to the most distant focus spot), delay between images 4 sec., duration 23 min., took 293 images, both as JPG and 16-bit 'Adobe RGB' RAW (.ARW) files.
• [6] Adobe Lightroom: imported all 293 16-bit 'Adobe RGB' RAW (.ARW) files (a) Applied current standard preset 005 (WB, tint:unaltered, Exposure+0.90, Presence: Texture+30 Clarity+30 Vibrance+5 Saturation+3, Sharp: Amount+70, Radius:1.0 Detail:25 Masking:20, NoiseRed: Lum:50 Detail:50 Contrast:0 Color:30 Detail:50, Smooth:50, LensCorr:all) (b) Subsequent changes (final values stated): Exposure:-- Texture+50 Clarity+10 Vibrance+5 (c) tone curve: 200>165, 240>220 (d) exported as TIFF/16bit, 'ProPhoto-RGB' colour profile.
• [7] FOCUS STACK processing: (a) tool 'Zerene Stacker' 1.04 (b) stacked all 293 TIFF images via 'PMax' method with slabbing set to '20 images per slab, 3 images overlap' (c) Stacking artefacts: retouched all leg sections with semi-transparency artefacts due to rear moss layers (i.e. 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: NO (d) tone curve: 25>10, 85>70, 175>160, 235>210, 250>235 (e) enhanced sharpness: NO (f) rotated: NO (g) cropped: 5100x3400 (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. 13 mm, i.e. magnif. factor based on full frame approx. 2.8x.
• [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:Dysdera crocata'.

Wiki Links edit

Wikipedia en: woodlouse spider (Dysdera crocata)

Wikipedia de: Großer Asseljäger (Dysdera crocata)

Licensing edit

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

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• to remix – to adapt the work

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