Askar FMA230 50mm f/5.5 Triplet Apo Lens / Guidescope # FMA230

Description: Description Please Note:All Sharpstar/Askar refractors undergo physical, mechanical and optical QC inspections at the factory, and an inspection checklist is included with each telescope.We may partially open the scope boxes to ensure that the scope has been inspected/certified by the manufacturer but we do not open the scope and inspect it again.However, if you would like us to perform a mechanical and cosmetic inspection of your telescope again before we ship it, just request this in the comments field when you place your order. We will be happy to do this at no extra cost for this scope, but this will delay your shipment by 1-2 business days. Note that we are unable to perform optical tests/inspections.Quick OverviewASKAR FMA230 50mm aperture apochromatic telescope/camera lens features multiple optical configurationsUses three-element objective lens with two ED elements for superb color correction and image qualityConfigures as a finder/telescope/guide scope with a focal length of 275mm and focal ratio of f/5.5Includes four-element 0.84x focal reducer to configure as a seven-element f/4.6 apo telescope with focal length of 230mm for wide-field astronomical imagingIncludes tube mounting rings, Vixen-style dovetail, and carrying handle with guidescope slot for a wide range of mounting configurationsProduct DetailsThe ASKAR FMA230 is a premium multi-functional optical instrument that features a 50mm ED fully multicoated triplet objective to deliver superb image quality. It works at f/5.5 as a finder/small telescope/guide scope. It can also be easily configured as a seven-element f/4.6 apochromatic refractor/camera lens, making it an ideal instrument for serious wide-field astronomical or terrestrial imaging.The heart of the FMA230 is an air-spaced 50mm apochromatic f/5.5 triplet with two ED elements to minimize chromatic aberration. The optics are fully multi-coated and the tube is internally blackened to ensure high contrast and minimal reflections.With a focal length of 275 mm, the objective lens is optimized and tested for demanding astronomical applications. The objective is carefully matched to the included four-element 0.84x focal reducer that transforms the overall focal ratio to f/4.6 and a focal length of 230 mm.For the price, this fast apochromatic lens offers excellent value and can approach the performance of telescopes that cost three or four times as much. This is especially true when matched with astronomy cameras with smaller 1" and 4/3" sensors. Cameras with larger APS-C and full-frame sensors may reveal slight aberrations at the edge of the field, especially when using the focal reducer.With the included focuser ring and extension tubes, the FMA230 is easily configured for visual or photographic use. For visual observing, it includes a 2” adapter that accepts eyepieces or star diagonals (sold separately). For observing with a 1.25” diagonal, the scope includes a small extension tube to ensure focus (NOTE: A 2”-to-1.25” adapter is not included with the FMA230).When configured for imaging with the focal reducer, the telescope side of the extension tube terminates in a standard M48x0.75 male T-thread for mating to a wide camera T-ring adapter (not included). The back focus is a standard 55mm. When the reducer is removed, the extension tube terminates with a female M62x0.75 thread. Imaging with the scope without the reducer will require you to use it in the "visual mode" with the included 2" adapter and the addtion of other spacers/adapters to reach focus (not included).The Askar FMA230 also includes a set of red anodized aluminum tube rings and a Vixen dovetail mounting plate. The rings and plate allow for easy attachment of larger astronomy cameras and DSLR and mirrorless cameras.The FMA230 also comes with an attractive carrying handle that doubles as a mount for finders, guide scopes, and an ASIAIR-PRO controller (all sold separately). The top of the handle is machined as an Arca-Swiss tripod plate, allowing you to ‘invert’ the scope and mount it easily on a photo tripod. The mounting rings, Vixen plate, and handle can also be completely removed when it’s used with a DSLR or mirrorless camera for handheld shooting or when the camera itself is mounted to a tripod.The overall tube length of the FMA230 is 248 mm with the focal reducer installed and 221 mm without a reducer or star diagonal. The FMA230 weighs 1045 g (2.36 lbs).Specifications:Aperture: 50mmFocal Length: 275mm (230mm with focal reducer installed)Focus Ratio: f/5.5 (f/4.6 with focal reducer installed)Objective Type:Triplet Dual ED Air-spaced APO (Objective lens)Septuplet Refractor for full-frame astrophotography (with reducer)Overall length:221mm (photographic mode with focal reducer)248mm (observation mode without star diagonal)Helical focuser travel: 30mmWeight: 1.1 kg (2.4 lbs.)Back-end Adapter:M48x0.75 (photographic mode)2" Adapter (for visual observation mode)Included: FMA230 Body with 0.84x focal reducerPair of tube ringsVixen dovetail plateCarrying handle/Guidescope Mount2" Eyepiece AdapterManualWhat's in the BoxFMA230 BodyPair of tube ringsVixen dovetail plateCarrying handle/Guidescope mount2" eyepiece adapterManual Payment Terms Payment must be received within 7 business days of auction closing.All our items will be shipped to buyer's payment address. So please check your shipping address before you make the payment. Shipping Terms Normally, we will arrange the shipment within 2 business days of receipt of payments.A tracking number will be emailed to the buyer at the time of shipment. Feedback If you are satisfied with our product and service, please leave 5 star positive feedback.However, if you are unhappy with the item or our service,please contact us before you leave the negative feedback. About US We are Skyoptikst Optical Technology CO., LTD. More information,please click our web site.If you have any questions please contact us.

Price: 629 USD

Location: Guangdong

End Time: 2024-01-25T14:04:10.000Z

Shipping Cost: 0 USD