Field Flatteners

Superb quality, non-focal reducing Field Flattener optimised for DSLR imaging on refractor telescopes with focal ratios of between f/5.5 to f6.0. Will also provide much improved results on refractors with focal lengths narrowly outside this optimised f/range.

The brand new RVO Horizon® 60 1.0x Field Flattener to suit the RVO Horizon® 60 ED refractor.

Explore Scientific MPCC Field Flattener with Canon EOS T2. Custom designed to be used with the Explore and Meade APOs. Includes a Canon fitting as standard.

An optically-matched M48-fitting doublet field flattener for Skywatcher's Esprit 80 ED PRO triplet refractor.

An optically-matched M48-fitting doublet field flattener for Skywatcher's Esprit 100 ED PRO triplet refractor.

The 1x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 103APO, it still maintained a focal length of 6.8.

Brand new adjustable field flattener for the William Optics Zenithstar 61 OTA. This is a brand new 2019 item which is now in stock at Rother Valley Optics.

Brand new adjustable field flattener for the William Optics Zenithstar 73 OTA. This is a brand new 2019 item which is now in stock at Rother Valley Optics.

The HoTech SCA field flattener accomodates f5 to f8 refractor telescope. You will see bright and sharp image across the entire field.

​Designed specifically for the Sky-Watcher Esprit-120 ED Apo Refractor, the new three-lens Focal Reducer/Flattener has a reduction factor of 0.77x. It comes with a standard adaptor with M48 thread.

Designed specifically for the Sky-Watcher Esprit-150 ED Apo Refractor, the new three-lens Focal Reducer/Flattener has a reduction factor of 0.77x. It comes with a standard adaptor with M48 thread.

The HD flattener kit for the Vixen FL55SS consists of a field flattener lens and a connecting tube ring, which is designed for the FL55SS optical tube.

The Explore Scientific 3in 0.7x Reducer - Corrector reduces the effective focal length of a particular instrument by the factor 0.7x (for f/8) and 0.8x (for f/10) respectively. The reducer/corrector not only reduces the focal length but also operates as a very effective field flattener.

With the Apex ED reducer, an f/5.5 apo refractor becomes an incredibly fast f/3.6 astrograph. A slower f/9 telescope like an RC becomes a speedy f/5.9 system.

The reducer HD kit for the Vixen FL55SS consists of a field flattener lens, a focal reducer and a connecting tube ring, which is designed for the FL55SS optical tube.