Player One E-series is an upgrade series of S-series, using high quality optical glass substrate and multi-layer composite coating technology, producting with higher standard than S-series, optimized for CMOS/CCD camera, can provide very professional effect in astrophotography.
1.25″ Photosphere 7.5nm filter（Photosphere enhanced filter）
Photosphere filter is an assistant filter, telescope must use baader film or Herschel wedge for adequate reduction of sun light, then you can use this filter for imaging.
Photosphere filter is a narrowband filter, CWL is 540nm, bandwidth 7.5nm.
Why to use a photosphere filter?
As we know, we doing solar photosphere imaging, usually use Herschel wedge to get best contrast, maybe add an IR685 filter to improve seeing condition. But, it’s not the best way to shoot photosphere.
Photosphere has best detail and contrast at almost 540nm, with this photosphere 7.5nm filter, you will be able to get some impressive solar granulation and sunspot details like this:
Where should I setup my photosphere filter?
Usually, we recommand to setup your photosphere filter on T-mount, this also can help you against dust drop on camera glass.
Specifications: 1.25 inch, thread M28.5*0.6
Frame thickness: body 5mm+ thread 2.5mm, a total of 7.5mm
Filter glass thickness: 1.85mm
CWL (center wavelength): 540nm
PV: 1/4 lambda
Blocking depth: OD4