astrod
27-10-2020, 12:41 PM
This is the original ZWO "Old" LRGB filter set still being sold by ZWO USD88 see here (https://astronomy-imaging-camera.com/product/lrgb-filters-1-25″).
They are NOT the more expensive "ZWO New LRGB Filters Optimized for ASI1600".
Comparing the two, the passbands are different, the transmission is slightly lower, the filter cell aperture is a bit less (thicker rims). They are a perfectly fine beginner set and are in excellent condition. I've attached a Astrobin top pick image of Saturn (https://astrob.in/2x0ndo/0/) where I used these exact filters (of course using a filter wheel).
On the ZWO site there is a question whether the filters are dichroic or absorptive and it is answered incorrectly (language issue). They are dichroic (the colour depends on angle and there are sharp transitions on the passbands).
$65 including registered post within Australia. Rod
They are NOT the more expensive "ZWO New LRGB Filters Optimized for ASI1600".
Comparing the two, the passbands are different, the transmission is slightly lower, the filter cell aperture is a bit less (thicker rims). They are a perfectly fine beginner set and are in excellent condition. I've attached a Astrobin top pick image of Saturn (https://astrob.in/2x0ndo/0/) where I used these exact filters (of course using a filter wheel).
On the ZWO site there is a question whether the filters are dichroic or absorptive and it is answered incorrectly (language issue). They are dichroic (the colour depends on angle and there are sharp transitions on the passbands).
$65 including registered post within Australia. Rod