This product is no longer stocked and therefore cannot be purchased until further notice.
Double Stack: Each SolarMax telescope is also available with a Double Stack. This means that two Etalon filters are installed, one behind the other. This reduces FWHM of the transmitted H-alpha line light to less than 0.5 Angstroms. Without a double stack, the FWHM is below 0.7 angstroms.
The smaller FWHM means noticeably higher contrast. The structures on the sun appear three-dimensional. The narrower FWHM of the filter also means the image is darker and requires fine readjustment using with the systems tuning system.
BF blocking filter: The deflection optics with the eyepiece receiver also accommodate the blocking filter. This filter reduces the brightness of the solar image and is therefore a very important part of the solar telescope, and which must under no circumstances be removed!
The number after the BF in the product name indicates the diameter of the blocking filter in millimetres. For example, BF10 means that the blocking filter is 10 millimeters in diameter. For purely visual observing, a small blocking filter is sufficient, but for photography a larger one should be selected.
Sol Ranger: Pointing a telescope at the sun is more difficult than you may think and can often involve involuntary glimpses of the sun with unprotected eyes! The Sol Ranger finder scope is a special solar finder that uses a ground glass screen. This allows you to point your telescope at the sun easily, safely and quickly.
Delivery includes a Cemax eyepiece. The eyepieces of this series are specially optimized for observation in H-alpha. The optimization applies to the remuneration. The eyepieces have no 'filtering effect' and can therefore also be used at night.
The quality of H-alpha filters is subject to relatively large production-related inconsistencies. We therefore check every filter with the Sun after receiving the filters - so you can be sure to receive a really good filter from us.