Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
Stress Free, Secure Transactions
You can trust purchasing and delivery with All-Star Telescope. All of our transactions are 100% secure and Level 1 PCI DSS compliant thanks to Shopify's ShopPay platform. For additional protection, we insure 100% of the value of every shipment we make. If it get's lost during shipment, we replace it. If it gets damaged during shipment, we replace it. We make sure your product arrives exactly as you would expect it to; we promise.
We also ensure privacy protection. We never keep any of your credit card information on file and any of your personal data is stored according to our policies.
30 Day Return Policy
Buy with confidence knowing that we accept returns up to 30 days after purchase. We want you to have something you will actually use and we are confident that we keep good quality products in our store with No Junk.
Price Match Promise
Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
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Askar 91F Flat-Field Quadruplet Astrograph...
Description du produit
The Askar 0.74× reducer, specially optimized for the Askar 111F, is designed to unlock a broader and more efficient deep-sky astrophotography experience.
The 0.74× reducer brings the Askar 111F's focal ratio down to F5.1, delivering a faster optical system while incorporating built-in field-flattening correction to effectively eliminate field curvature - ensuring sharp and clear stars from the center to the very edges of the frame. The shorter focal ratio provides a wider field of view and shorter exposure times, making it particularly well-suited for capturing expansive nebulae, star clusters, and faint or fast-moving celestial objects.
The Askar 111F 0.74× Reducer features a triplet optical design and supports a 44mm full-frame image circle. Its back focus is 55mm (measured from the M48 thread), and both ends feature M68×1 threads for optimal adaptability and stability.
The 111F photographic extension tube includes M54×0.75 and M48×0.75 adapters, allowing for direct and convenient connection to the 111F 0.74× reducer. The reducer’s rear adapter ring features a built-in M48×0.75 standard 2-inch filter thread, enabling direct installation of various astronomical filters to accommodate different imaging needs.
The entire reducer is precision CNC-machined and comes with front and rear metal threaded caps to protect the optics from dust when not in use.
Specifications
| Parameter | |
| （After attaching）60F Focal length | 566mm |
| （After attaching）60F Focal ratio | f/5.1 |
| Lens Number | Triplet design |
| Back Focus | 55mm（from the base of M48 male thread） |
| Weight | 0.5kg |
| Rear-end thread type | M68*1 |
Size Diagram
Installation
Optical Path Diagram
Spot Diagram
