Barlow Lenses 
Barlow lenses are an important optical element for extending the telescope focal length. This optic also plays an important role in astrophotography (especially planetary photography).
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TS Glass Path Corrector for Binoviewers 1 1/4".
2" Paralizer Adapter für APM 2 inch coma correctiing 1,5x telezentric Barlow 
The Lacerta 4-element Barlow lenses are telecentric systems and offer superior imaging performance, even off the optical axis.
The Lacerta 4-element Barlow lenses are telecentric systems and offer superior imaging performance, even off the optical axis.
The Lacerta 4-element Barlow lenses are telecentric systems and offer superior imaging performance, even off the optical axis.
2 Inch Barlow with separat Barlow Element.
APM 2-part Adaptor Kit for 2,7x comacorrected barlow element - photography and visual using..
Our totally new comacorrecting 1 1/4" ED-Barlowlens - calculated from Gerd Güring - Germany.
Our totally new comacorrecting 1 1/4" ED-Barlow Element - calculated from Gerd Güring - Germany.
Our unique comacorrecting 1 1/4" ED Double Barlow - calculated by Gerd Güring - Germany.
The uncompromising APM TMB-Design 1.8 x ED Barlow element is available again. The most important data: 
At 588 nm wavelength the negative focal length is - 104.20 mm Cemented 2 lens element with ED glass Free aperture : 22 mm Broadband multicoated Magnification factor 1.8x Screwable into our APM adapter kit (see accessories) Baader Hyperion 2.25x Barlow lens w/ 1.25" and T2 connection