Optical Accessories

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.

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

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

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.