An ERF (Energy Rejection Filter) is an essential part of a solar telescope. The performance of a Coronado or Lunt solar telescope can be increased by replacing the factory solar telescope objective lens with a larger one and placing this ERF filter in front of it.
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Astronomy
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- Astronomical telescope
- Telescope mounts
- Eyepiece
- Astrocameras
- Filter
- Filter wheel, filter drawer
- Focal reducer, corrector
- Accessory for astrophotography
- Finderscopes
- Adapter
- Barlow lens
- Solar telescope
- Telescope diagonals
- Focuser
- Binoviewer
- Power supply
- Telescope mount motor drives
- Mount accessory
- Collimation
- Accessories for ZWO Seestar smart telescope
- Astronomical literature
- Storage
- Dew remover
- Miscellaneous
Nature observation
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- Binoculars
- Monoculars
- Spotting scopes
- Spotting scope eyepieces
- Photo tripod
- Spotting scope cases
- Accessories for nature observation
Outdoor
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- Flashlight
- Laser rangefinder
- Accessory for flashlight
- Battery
- Battery charger
Hunting
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- Thermal imaging device
- Thermal imaging rifflescope
- Nightvision rifflescope
- Hunting camera
- Hunting camera accessories
- Thermal camera and night vision accessories
Microscopy
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- Microscope for children
- Biological microscope
- Stereo microscopes
- Digital microscopes
- Microscope camera
- Prepared slides
- Microscope eyepiece
- Microscope objective
- Microscope optical accessory
- Microscope accessory
Information
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Knowledge base