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10mm Threaded Rod Length(504+).

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It lightens green foliage, which is particularly important with dark green leaves which can record very dark without a filter. It therefore gives a more natural, lighter feel to the photograph.

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The 32mm-Plössl-eyepiece is the perfect eyepiece for a large field of view at telescopes with 1,25"-focuser; eyepieces with longer focal lengths don't provide a larger field of view (but a smaller apparent field).

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Standard Barlow elements often can not provide enough magnification for taking images of the planets. Classical eyepiece projection is the solution if you want to increase the focal length by 4x or more. The Classic Orthos provide the necessary high magnifications in combination with an OPFA (Eyepiece Projection adapter). Orthoscopic eyepieces are well-known for high sharpness on the axis and very good transmission perfect for planetary observations. So, it is possible to get sharp views of the planets even at very high magnifications.

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Color filtersWindows 10

A typical yellow filter will have a filter factor of 2 (the manufacturer will supply the exact factor). Most cameras with TTL metering will correct automatically for the filter factor but check your particular model.

Orange filters give stronger effects than  yellow filters but are not as bold and dramatic as a red. It is therefore an ideal choice to span the effects given by both these filters.

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The lean housings of the Classic-eyepieces with diameters of less than 35mm fit without any problems into all common projection adapters and can also be used without problems for visual use at any binoviewer.

Filters have long been a popular accessory for photographers and offer a number of different functions or effects. In both analogue and digital photography it is possible to recreate some of these in the darkroom or digital darkroom. However there has always been a benefit to getting it right in camera.

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Although a yellow filter darkens blues, it reproduces green, yellow, orange and red in lighter shades. This gives more differentiation between the different colours of foliage while flesh tones have a more natural look.

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The lens assembly consists of a triplet-element and one plano-convex eye lens, so there are only four glass-air-surfaces. The interior has been blackened for a very good suppression of stray light. Of course, the hard anodised barrel has got a filter thread.

Dec 21, 2021 — Depth of field (DoF) is the area between the nearest and farthest points from the camera that are acceptably sharp in an image. A deep DoF means ...

Color filtersphoto

Blue skies will be recorded in very dark tones on the print, giving bold contrast between the sky and clouds. An orange filter will also penetrate haze and fog. Most flowers will be recorded with a significant difference in tone from the surrounding foliage giving impact and effect.

It also lightens blues and darkens yellows, oranges and reds which helps separation in scenes containing a mix of colours.

Looking into the eyepieces, you'll see the effect of the anti-relex-coating and the blackened lens edges. The coating is so good that it seems like there are no lenses at all! On our optical bench, we couldn't find any disadvantages compared to so-called "planetary eyepieces" which cost five times more.

Parfocal eyepieces with a very high transmission, very good contrast and thus a very clear field of view, free of distortions. The multi-coating eliminates almost all internal reflections. The eyepieces provide 50° apparent field (6/10/18mm Ortho), sharp field stops and excellent ergonomics for comfortable observing.

Many photographers use a yellow filter to “bring out the clouds”. This works by darkening the blue sky, giving a greater visual separation between the darkened sky and the white clouds on the final print. A yellow filter will also give improved penetration of haze and fog.

A typical orange filter has a filter factor of 4 (the manufacturer will supply the exact factor with the filter). Most cameras with TTL metering will not be able to automatically correct for the filter factor. Due to the dramatic effects given by an orange filter it is recommended that shots are taken with +1 stop extra exposure.

A yellow filter has always been the “classic” first choice filter for black & white film photographers. It gives an excellent balance between photographic effect and ease of use making it a useful and versatile accessory.

Using an OPFA, you can set the magnification almost without limits by changing the distance between eyepiece and camera sensor. You can find information on calculating the resulting focal length in the description of the OPFA-system. For best results and highest resolution, you should use the Fluorit Flatfield Converter (FFC / 3x-8x) instead, which was designed especially for projection photography.

Infrared Spectroscopy · Near-IR region: 12500-4000 cm-1 (~800-2500 nm wavelength) – closest to the frequency of visible light · Mid-IR region from 4000-400 cm-1 ...

Color filtersphotography

Although limited in application, it can be the perfect solution for many photographs. A typical green filter has a filter factor of 2 (the manufacturer will supply the exact factor with the filter) while most cameras with TTL metering will be able to correct automatically for the filter factor.

A typical red filter has a filter factor of 4 to 5 (the manufacturer will supply the exact factor with the filter). Most cameras with TTL metering will not be able to automatically correct for the filter factor. Owing to the dramatic effects given by a red filter it is recommended that shots are taken giving +1 to +2 stops of extra exposure.

When shooting flowers without a filter there's often little tonal  difference between the flowers and the foliage in the print. A red filter will, in almost every case, give a significant difference in tone, making the photograph more interesting and dramatic.

A blue filter is not often associated with black & white photography however, it can really add “mood” to a photograph by increasing the effect of haze or fog.

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Unlike the subtler changes given by yellow and orange filters, a red filter can create bold and dramatic effects. Blue skies are now recorded as black on the print, resulting in an impending thunderstorm effect. Pictures of mixed material buildings gain drama and clarity. A red filter will also give marked penetration of haze and fog. When used with a film like [SFX] it can create an infrared style look.

The Classic Plössl is perfectly suited for afocal projection with the ADPS (Afocal Digital Projection System) and a compact camera with fixed lens the eyepiece's large lens on the camera side reduces vignetting, so that you can use a larger part of the camera sensor. The lower magnification and the resulting larger field of view make this combination very interesting for images of the surface of moon or sun (the latter only with a suitable solar filter).

Mar 24, 2022 — Dispersion is a phenomenon associated with the refraction of light. Though it can occur with any type of wave and with any wavelength of ...

A typical blue filter has a filter factor of 2 (the manufacturer will supply the exact factor with the filter) while most cameras with TTL metering will be able to correct automatically for the filter factor.

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In black & white photography, colour filters in particular are useful as they can control how the colours in a scene are reproduced as greys. Normal black & white films are sensitive to all wavelengths of visible light although how they interpret the colours of that scene will not always match the way you see it. Colour filters therefore allow us to modify, at the point of capture, the way the film will respond to the different colours.