Optical Accessories
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Optical Accessories
Everything you need of optics for visual and photographic work or accessories for DIY projects, can be found in these categories.
- Eyepiece size: 3 inch (76.2mm)
- Eyepiece brand: Kokusai Kohki
- Eyepiece series: Masuyama
- Apparent field of view: 52°
- Focal length (mm): 80mm
The nebula filter passes H-Beta, O-III and H-Alpha and is designed for astrophotography.
- IDAS nebula filters are produced in Japan
- The NB1-48 is supplied in a filter cell with M48x0.75 / 2" filter thread
- Exposure time factor 4 - four times the exposure time is possible before you reach the sky background.
- The filter is especially well suited for tricolor shots of nebulae with color cameras
- Scattered light and nightglow are effectively suppressed, leaving stars and sky background relatively neutral
- High-quality anti-reflection coating
- Scratch-resistant hard coating
- With 2.5 mm thickness the filter is parfocal to other IDAS filters
- The infrared light is blocked, so the filter also fulfills the function of an IR blocking filter.
IDAS narrowband filter set for astrophotography - high contrast - also for fast telescopes - up to 70% transmission at f/2
- H-Alpha 6.8nm, O-III 6.0nm and S-II 6.3 nm half width
- 2" mounted standard filter thread
- Low profile filter mount - height only 6 mm
- Reflection minimizing coating
- no halo problem due to anti-reflective layer
- Half-widths for wide range of applications
- Can also be used on extremely fast telescopes
- Made in Japan
With this filter set, you can take visual RGB images, VIS-IR RGB images and, if using an optional IR pass filter, NIR RGB images.
- color rendering similar to that of the human
- versatile due to transmissions in VIS and NIR
- suitable for cameras with 1.25" connection
- reflex-reducing design
- more durable coating for safer cleaning
Item condition: new, but not original packed
The orthoscopic eyepiece from Kokusai Kohki is very well corrected and offers very high sharpness and ultimately high contrast.
- Classical orthoscopic design
- 42° apparent field of view
- Fully multi-coated
- Bright image, very high sharpness, extreme contrast
- Entire series parfocal.
The orthoscopic eyepiece from Kokusai Kohki is very well corrected and offers very high sharpness and ultimately high contrast.
- Classical orthoscopic design
- 42° apparent field of view
- Fully multi-coated
- Bright image, very high sharpness, extreme contrast
- Entire series parfocal.
The orthoscopic eyepiece from Kokusai Kohki is very well corrected and offers very high sharpness and ultimately high contrast.
- Classical orthoscopic design
- 42° apparent field of view
- Fully multi-coated
- Bright image, very high sharpness, extreme contrast
- Entire series parfocal.
The orthoscopic eyepiece from Kokusai Kohki is very well corrected and offers very high sharpness and ultimately high contrast.
- Classical orthoscopic design
- 42° apparent field of view
- Fully multi-coated
- Bright image, very high sharpness, extreme contrast
- Entire series parfocal.
