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LUNT LS100 ERF 100mm Energy Rejection Filter

Posted: Thu Nov 08, 2018 1:31 am
by Starry Jack
I have a near perfect Lunt 100mm (4") ERF. This is used in a DIY PST (or similar) H-alpha scope modification. You may recognize this ad also on Cloudy Nights.

In my case, I used it on the end of my inexpensive 100 mm donor scope and placed the PST (without its own 40 mm lens unit) in the focuser. The result becomes a 100mm PST! It takes wonderful photos (I never trust any home-built scope with my eyes).

Lunt does not sell these directly anymore, but they appear to be available from Bresser and Teleskop Express and APM Telescope for 519 Euros ($593) + International Shipping.

This does not include a mounting cell, but mine fit PERFECTLY right in the objective lens holder of my Celestron 100 mm donor scope.

-Glass is RG630
-Aperture is 100mm
-Thickness is 3.5mm
-Side 1: Dielectric IR Blocking Coating
-Side 2: Broadband AR coating
-Wavefront: <1/4 wave

Asking $395 (includes $10 of shipping charges and includes PayPal fees) or will consider a trade for a Blocking Filter. I am in the San Diego area for local pickup if you like.
Thank you for looking,

Re: LUNT LS100 ERF 100mm Energy Rejection Filter

Posted: Fri Nov 09, 2018 4:30 am
by Starry Jack