Glas FK61 (similar to Ohara FPL51), has blackenededges, a measured transmission von over 99% from 400 nm to 700 nm, optimized for F/4 Newtonian-Telescopes. The barlow has a negative focal length of - 62.9 mm and a working backfocuse of 105 mm from center last lens to focuse ( eyepiece field stop). You will need now a 1.25" eyepiece holer 104 mm long
Coma Corrector (2") for Newtonian Reflectors Optimised for all Sky-Watcher fast-ratio f/5 Newtonian reflectors / Dobsonians, with 2? focuser. Delivers stunning wide-field views with pinpoint stars to the edge of the field. Magnification remains unaltered. Supplied complete with necessary adapters for visual use. For imaging use with a DSLR camera, a suitable M48x0.75 adaptor is required to match your camera. Delivery contents 2" coma corrector adapter for visual use Specifications: Connection to camera: M48 x 0.75 Thread Connection to eyepiece: 2" with Adapter Connection to telescope: 2" Made for: f/5 Newtonian telescopes
TS-Optics 2" MaxField Coma Corrector for Newtonian Telescopes - suitable for Cameras up to full frame size Sensors This Newtonian coma corrector combines the advantages of the short 2-element coma correctors with the outstanding field correction of the Wynne corrector and the GPU. The corrector is usable with any Newtonian with a 2" focuser. It provides 100% ilumination up to 35 mm diameter and 95% illumination up to 43 mm diameter, so the MaxField Coma Corrector is even suitable for cameras with full-frame size sensors. On Astrobin you will find many exciting astrophotos with the TS-Optics Maxfield coma corrector. See for yourself how well the corrector works. Link to Astrobin - Images with the TS-Optics Maxfield Corrector The advantages of the 2" MaxField coma corrector over the GPU: Star sharpness on the axis and in the filed is comparable. But with 72 mm length (length of the 2" barrel), the corrector is significantly shorter than the GPU which has 100 mm length. Thus the TS-Optics MaxField corrector has two advantages: ♦ The focuser does not protrude into the inside of the telescope even if it is completely sunk into the focuser. ♦ The illuminated field is by more than 20% larger than the field of the GPU, due to the shorter length. The advantages of the 2" MaxField coma corrector over the short 2-element coma correctors: The TS MaxField consists, like the Wynne correctors, of three lenses. The stars on the axis and in the field become finer and smaller than simple Ross correctors can provide. Especially the new astro cameras with very small pixels show the difference very clearly. Furter features of the TS MaxField Coma Corrector: ♦ Versatile - usable for photography and for observation with an optional 2" adapter ♦ Flexible camera adaption with the M48x0.75 thread ♦ M48 adapters for DSLR available ♦ 55 mm working distance - suitable for DSLR cameras and also for astro cameras like the ones from ZWO ♦ Very good multi-coated optics for highest sharpness without distracting reflections ♦ Reduces the focal length by the factor 0.95. The focal plane is not changed. ♦ The corrector fits to any Newtonian with 2" focuser and a working distance of at least 60 mm. These prerequisites are fulfilled by almost all Newtonian telescopes on the market. Spot diagrams of the TS MaxField corrector: Spot diagrams and illumination with different Newtonian telescopes - PDF file Suggestion for an astro camera with 17.5mm camera back focus and T2 connector: The camera back focus or flange focal distance is the distance from the T2 (M42x0.75) thread to the sensor. Most cooled astro cameras have this distance. Adaption with filter drawer for filter change: ♦ Astro Camera ... 17.5mm flange focal distance ♦ TSM48-T2L extension to M48 ... 6mm travel ♦ TSFSLM48 ... Filter drawer ... 18mm travel ♦ BAHYP14 ... 14mm M48 extension ... 14mm path The additional 0.5mm compensates the optical path of the filter. About 1/3 of the filter diameter must always be added to the working distance of the corrector (55mm).
Item condition: new and original packed
Wichtiger Hinweis zur Mehrwertsteuer: Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.