https://www.photo-spectrum.info/pages.html quarto-1.7.32 Sun, 01 Jun 2025 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/illumination/spectral-imaging.html equipment illumination https://www.photo-spectrum.info/pages/illumination/spectral-imaging.html Sun, 01 Jun 2025 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/illumination/NIR-sources.html ]]> equipment illumination https://www.photo-spectrum.info/pages/illumination/NIR-sources.html Thu, 06 Mar 2025 22:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/illumination/Mechanic-LS720.html (Blaker 1978; Durand 1977). Alternatively small light tents can be used (Blaker 1978; Durand 1977). When photographing some types of objects such as electronic circuits or biological samples in water, reflections can be difficult to control by changing the light source position. A traditional approach to control reflections is the use of polariser filters. These are effective only when the incident light is polarised, like sunlight. In the case of artificial light sources, for effective control of reflections polariser filters have to be used both on the lens and on the light source at different rotation angles (Blaker 1978). ]]> equipment illumination https://www.photo-spectrum.info/pages/illumination/Mechanic-LS720.html Wed, 05 Mar 2025 22:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/camera-spectral-response/E-M1-fs-spectral-response.html ]]> equipment cameras https://www.photo-spectrum.info/pages/camera-spectral-response/E-M1-fs-spectral-response.html Thu, 19 Dec 2024 22:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/cameras/OM1-focus-bracketing.html macro photography https://www.photo-spectrum.info/pages/cameras/OM1-focus-bracketing.html Sat, 10 Feb 2024 22:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/illumination/PWM-banding-readout.html Using LEDs: drivers and dimming. Please, consult this earlier article for additional information about the different approaches used to adjust the light output of LEDs. ]]> equipment illumination https://www.photo-spectrum.info/pages/illumination/PWM-banding-readout.html Mon, 04 Dec 2023 22:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/lenses/lenses-for-insects.html macro photography https://www.photo-spectrum.info/pages/lenses/lenses-for-insects.html Sun, 27 Aug 2023 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/lenshoods/oversized-lens-hoods.html equipment lens hoods https://www.photo-spectrum.info/pages/lenshoods/oversized-lens-hoods.html Fri, 12 May 2023 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/filters/UV-filter-stacks.html equipment filters https://www.photo-spectrum.info/pages/filters/UV-filter-stacks.html Fri, 14 Apr 2023 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/filters/UV-filters.html equipment filters https://www.photo-spectrum.info/pages/filters/UV-filters.html Thu, 13 Apr 2023 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/cameras/OM1-notes.html cameras https://www.photo-spectrum.info/pages/cameras/OM1-notes.html Tue, 11 Apr 2023 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/fluorescence/uvaivf-methods.html ]]> equipment illumination filters https://www.photo-spectrum.info/pages/fluorescence/uvaivf-methods.html Fri, 14 Oct 2022 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/illumination/led-fill-lights-2.html equipment illumination https://www.photo-spectrum.info/pages/illumination/led-fill-lights-2.html Fri, 14 Oct 2022 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/illumination/vis-nir-led.html equipment illumination https://www.photo-spectrum.info/pages/illumination/vis-nir-led.html Sun, 24 Oct 2021 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/filters/NIR-filters.html equipment filters https://www.photo-spectrum.info/pages/filters/NIR-filters.html Sun, 31 Jan 2021 22:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/time-lapse/time-lapse-under-a-tree.html Lens adapter with filter drawer and Lens adapters: flange-to-flange distance I discussed how crucial it is to achieve the exact effective flange-to-flange distance when dealing with adapted objectives with a very short focal distance. I also described how I shimmed an adapter to achieve this. ]]> techniques time-lapse https://www.photo-spectrum.info/pages/time-lapse/time-lapse-under-a-tree.html Mon, 28 Sep 2020 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/lens-adapters/adapters-lens-to-flange-distance.html https://www.kentfaith.com. This is a new design advertised as being of high precision. I was specially interested as this is one of the very few or maybe the only series of relatively low cost adapters with a non-reflective black interior finish. This is is important to prevent reflections that otherwise degrade image contrast or create flare and ghost images. Please see Black anodised aluminium in IR and Commlite products: how I wasted my money.. ]]> equipment lens adapters https://www.photo-spectrum.info/pages/lens-adapters/adapters-lens-to-flange-distance.html Mon, 29 Jun 2020 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/lens-adapters/OWL-lens-adapter.html equipment lens adapters filters https://www.photo-spectrum.info/pages/lens-adapters/OWL-lens-adapter.html Mon, 29 Jun 2020 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/filters/uv-cut-filters.html equipment filters https://www.photo-spectrum.info/pages/filters/uv-cut-filters.html Thu, 11 Jun 2020 21:00:00 GMT Pedro J. Aphalo https://www.photo-spectrum.info/pages/filters/uvir-cut-filters.html equipment filters https://www.photo-spectrum.info/pages/filters/uvir-cut-filters.html Wed, 10 Jun 2020 21:00:00 GMT