Altair 115mm TRIBAND H-Alpha CaK D-ERF Fliter
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I am selling an ALTAIR 115mm Triband D-ERF filter.
This filter is designed to be attached to the front of scopes with an aperture of up to 115mm.
Naturally, this filter cannot be used for solar observation on its own. Those purchasing this filter must understand its correct usage.
This filter passes Hα, Calcium K-Line, and Calcium H-Line wavelengths. Therefore, it is recommended for those who photograph or observe at these three wavelengths.
I used this ERF in combination with a QUARK filter on a 4-5 inch scope.
I introduced it to minimize optical degradation as I used it on a valuable objective lens.
A resin case for storing the ERF is also included. This is a case I personally selected.
There is some dust and dirt on the optical system, but the condition is very good.
Price include shipping, but are subject to a 4% PayPal fees.
I will ship worldwide from Japan.
I will provide a tracking number at the time of shipping so the buyer will know where the item is at times.
Regards,
This filter is designed to be attached to the front of scopes with an aperture of up to 115mm.
Naturally, this filter cannot be used for solar observation on its own. Those purchasing this filter must understand its correct usage.
This filter passes Hα, Calcium K-Line, and Calcium H-Line wavelengths. Therefore, it is recommended for those who photograph or observe at these three wavelengths.
I used this ERF in combination with a QUARK filter on a 4-5 inch scope.
I introduced it to minimize optical degradation as I used it on a valuable objective lens.
A resin case for storing the ERF is also included. This is a case I personally selected.
There is some dust and dirt on the optical system, but the condition is very good.
Price include shipping, but are subject to a 4% PayPal fees.
I will ship worldwide from Japan.
I will provide a tracking number at the time of shipping so the buyer will know where the item is at times.
Regards,
