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"Internal focusing" is the term for that and it is rather common. Certainly a lot more so than "internal zooming" which makes a lens bulkier for transport and thus is comparatively rare for large zoom ranges. Off the cuff I remember the Panasonic DMC-FZ50 as a superzoom camera with both internal focusing and zooming. To have either ...


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Folmer & Schwing was a New York City based company that began making and selling bicycles in 1887. The owners were William F. Folmer and William E. Schwing. In 1896 cameras first appeared in their catalog of products. At the time, bicycle mounted cameras were becoming popular. Mr. Folmer created the first Graflex camera in 1898. This version had a ...


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I do not recognize, nor have I seen such filter sets. However, I can speculate, along with the best of you. I think they were used in a lanternslide projector. Early in the history of our art, devices like cameras, projectors, as well as enlargers were apparatuses mainly made of wood. The lanternslide was a positive transparency that was film emulsion, ...


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Ha Solar Telescopes While Hydrogen alpha (Ha) solar telescopes such as those from Lunt Solar Systems or the Meade Coronado line do filter out all wavelengths except Ha, they also have a substantial energy rejection filter because the Sun's energy is overwhelming. Normal Ha Filters The Ha filters for astronomy (just a filter ... no energy rejection) are not ...


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