Ls 110 photometer

Manufactured by Konica Minolta

Sourced in Japan

The LS-110 photometer is a compact and versatile instrument designed for precise luminance measurements. It features a wide measurement range and a highly accurate photodetector, allowing for reliable and consistent readings across a variety of lighting conditions.

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Lab products found in correlation

Matlab, by MathWorks (2 mentions) 3d vision lcd shutter glasses, by NVIDIA (2 mentions) Psychtoolbox, by MathWorks (1 mentions) Xl2720z, by Konica Minolta (1 mentions) Eyelink 2000 desktop mount, by SR Research (1 mentions) Trinitron 2100 monitor, by Sony (1 mentions) Datapixx crt driver, by VPixx Technologies (1 mentions) Viewpixx 3d display, by VPixx Technologies (1 mentions)

Close spelling variants of this product

Minolta LS-110 photometer LS-110

9 protocols using ls 110 photometer

Stereoscopic Depth Perception Experiment

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Eleven participants (including authors H.B. and V.P.) took part in Experiment 1 (mean age = 27.7, SD = 4.58; 3 females) and nine in Experiment 2 (mean age = 27.4, SD = 4.67; 1 female). All participants except the authors were naïve to the purpose of the study and were recruited from staff and students at the University of Birmingham and the University of Cambridge. All had normal or corrected to normal vision, and provided written informed consent. They were screened to ensure they could reliably discriminate depth positions defined by at least 1 arcmin of horizontal disparity. The protocols for the experiment were approved by the University of Birmingham’s STEM ethics committee. The work was carried out in accordance with the Code of Ethics of the World Medical Association (Declaration of Helsinki).
Stimuli were viewed through a mirror stereoscope, where the two eyes viewed separate gamma corrected CRT (ViewSonic FB2100X) monitors from a distance of 50 cm. Screen resolution was 1600 × 1200 pixels at 100 Hz. Luminance calibration was achieved by linearizing grey-level values using a Minolta LS110 photometer. Presentation monitors were recalibrated regularly to ensure that stimulus luminance was constant for different participants and across experiments.

Pelekanos V., Ban H, & Welchman A.E. (2015). Brightness masking is modulated by disparity structure. Vision Research, 110(Pt A), 87-92.

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Visual Stimulus Presentation and Eye Tracking

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All visual stimuli were presented on an LCD monitor (BENQ XL2720Z, 1,920 × 1,080 pixels, 100 Hz vertical refresh rate) calibrated and linearized with a Konica Minolta LS-110 photometer. The subjects sat in front of the monitor at a viewing distance of 57.5 cm and with their head restrained on a chin rest. Their eye positions were monitored with an infrared image eye tracker (EyeLink 2000 Desktop Mount, SR Research). Two key buttons were placed in front of the subjects. We used MATLAB (Mathworks) with Psychtoolbox extension (Brainard, 1997 (link); Pelli, 1997 (link)) on a PC to present stimuli and collect the manual RT data.

Liang L., Zhou Y., Zhang M, & Pan Y. (2017). Revealing the Radial Effect on Orientation Discrimination by Manual Reaction Time. Frontiers in Neuroscience, 11, 638.

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Visual Perception Experiments on Macintosh

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The experimental programs were run on Macintosh computers in the Matlab (MathWorks Inc.) environment, using functions from the Psychophysics Toolbox (Brainard, 1997 (link); Pelli, 1997 (link); Kleiner et al., 2007 ). Participants were seated in a dim-lighted room. For participants recruited at Université de Montréal (only adults), all stimuli were presented on 27-inch Asus VG278H monitors (1920 × 1080 pixels at 120 Hz), calibrated to allow linear manipulation of luminance. Luminance ranged from 0.33 to 245 cd/m² (measured with a Samsung SyncMaster 753df photometer). A chinrest was used to maintain a constant viewing distance. For participants recruited at The University of British Columbia (all children and some adults), stimuli were presented on a 24-inch A1267 Apple Cinema Display (1920 × 1200 pixels at 60 Hz); luminance ranged from 1.6 to 159 cd/m² (measured with a Minolta LS-110 photometer).

Tardif J., Watson M.R., Giaschi D, & Gosselin F. (2021). The Curve Visible on the Campbell-Robson Chart Is Not the Contrast Sensitivity Function. Frontiers in Neuroscience, 15, 626466.

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Stereoscopic Visual Perception Experiment

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Stimuli were presented on a VIEWPIXX 3D monitor, viewed from a distance of 96 cm. The monitor screen was 52 cm wide and 29 cm tall. The screen resolution was 1920 × 1080 pixels, with a refresh rate of 120 Hz. Each pixel subtended 1 arc min. Stimuli were presented at 8-bit resolution. Stereoscopic presentation was achieved using a 3DPixx IR emitter and NVIDIA 3D Vision LCD shutter glasses. The cross-talk between the left and right images, measured using a Minolta LS-110 photometer, was 0.12%. Participants’ responses were recorded using a RESPONSEPixx response box. Stimuli were generated and presented using MATLAB and the Psychophysics Toolbox extensions (Brainard, 1997 (link); Kleiner, Brainard, & Pelli, 2007 ; Pelli, 1997 (link)).

Hibbard P.B., Haines A.E, & Hornsey R.L. (2017). Magnitude, precision, and realism of depth perception in stereoscopic vision. Cognitive Research: Principles and Implications, 2, 25.

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Visual Perception Stimulus Presentation

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Stimuli were presented using a Sony Trinitron 2100 monitor with a screen resolution of 1280 × 1024 pixels and a vertical refresh rate of 100 Hz. The luminance response of the monitor was measured and calibrated using a Minolta LS-110 photometer. The luminance of the mid-grey background was 38.5 cdm

^{2}

and the maximum luminance of the monitor was 74 cdm

^{- 2}

. One pixel subtended 1.47 arc min. A Datapixx CRT Driver (Vpixx Technologies, Saint-Bruno, QC, Canada) was used to achieve 16-bit control of contrast levels. Stimuli were generated and presented using MATLAB and the Psychophysics Toolbox extensions [53 (link),54 ,55 (link)]. Responses were made via the left and right arrow keys on a standard keyboard.

Asher J.M., O’Hare L, & Hibbard P.B. (2021). No Evidence of Reduced Contrast Sensitivity in Migraine-with-Aura for Large, Narrowband, Centrally Presented Noise-Masked Stimuli. Vision, 5(2), 32.

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Gamma Correction Measurement Protocol

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We used a Minolta LS-110 photometer (Minolta, Osaka, Japan) for all readings. These devices are widely used for performing gamma correction, and have a wide dynamic range. Measurements were performed manually for the following systems:

Baker D.H., Kaestner M, & Gouws A.D. (2016). Measurement of crosstalk in stereoscopic display systems used for vision research. Journal of Vision, 16(15), 14.

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Stereoscopic Stimulus Presentation and Response Tracking

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Stimuli were presented on a VIEWPIXX 3D monitor, viewed from a distance of 130cm. The monitor screen was 52cm wide and 29cm tall. The screen resolution was 1920x1080 pixels, with a refresh rate of 120Hz. Each pixel subtended 0.72 arc min. Stimuli were presented at 8-bit resolution. Stereoscopic presentation was achieved using a 3DPixx IR emitter and NVIDIA 3D Vision LCD shutter glasses. The crosstalk between the left and right eyes’ views, as measured with a Minolta LS110 photometer, was 0.12%. Participants’ responses were recorded using a RESPONSEPixx response box. Stimuli were generated and presented using MATLAB and the Psychophysics Toolbox extensions [60 (link)–62 ].

Hornsey R.L., Hibbard P.B, & Scarfe P. (2016). Binocular Depth Judgments on Smoothly Curved Surfaces. PLoS ONE, 11(11), e0165932.

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Visual Perception Study with DLP Projector

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Fourteen undergraduate students from University of Rochester (18 to 22 years old, 5 males and 9 females) took part in this study. All participants had normal or corrected-to-normal vision. The Research Subjects Review Board at the University of Rochester approved experimental protocols and confirmed that all research was performed in accordance with relevant guidelines and regulations. Informed consent forms were obtained from all participants. Stimuli were generated by Matlab Psychtoolbox^{40 (link)} and presented using customized digital light processing (DLP) projector (DepthQ WXGA 360 driven by a NVIDIA Quadro FX 4800 at 1280 × 720 resolution). The projector frame rate was 360 Hz, resulting in discrete 2.78-ms frames. DLP projectors are natively linear, and this was verified with a Minolta LS-110 photometer. Viewing distance was 61.5 inches, with a projected image of 46.74 × 25 inches.

Zhang R, & Tadin D. (2019). Disentangling locus of perceptual learning in the visual hierarchy of motion processing. Scientific Reports, 9, 1557.

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Contrast perception ERP protocol

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Event-related potentials were recorded using an ANT Neuroscan EEG system and a 64channel Waveguard cap with electrodes arranged according to the 10/20 system. The ground electrode was positioned at AFz, and a whole head average was used as a reference. Data were digitised at 1kHz using the ASALab software. Stimuli were presented on a ViewPixx 3D display (VPixx Technologies Inc., Quebec, Canada) running in M16 mode (16-bit luminance resolution) with a mean luminance of 51cd/m 2 and a refresh rate of 120Hz, using Matlab and elements of the Psychophysics Toolbox (Brainard, 1997; Kleiner, Brainard, & Pelli, 2007; Pelli, 1997) . The display was gamma corrected using a Minolta LS110 photometer, fitting the data with a 4-parameter exponential function, and transforming stimulus intensities using the inverse of the function to ensure linearity. Participants were seated in a darkened room 57cm away from the display. Instructions for the task were to 'indicate the grating that appeared higher in contrast'. They were asked to fixate on a central cross throughout the task and used a mouse to indicate their responses. There were 200 trials per target contrast (1000 trials total, yielding 2000 stimulus-locked ERPs). The task was run in 5 blocks of approximately 8 minutes, with short breaks in between.

Vilidaite G., Marsh E, & Baker D.H. (2019). Internal noise in contrast discrimination propagates forwards from early visual cortex. NeuroImage, 191.

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