The William Optics RedCat 51-II-U APO is a 250mm prime lens suited to a DSLR or astrocam. The 4-element Petzval lens arrangement will ensure a flat image plane, meaning no flattener is required and your stars will be sharp to the edge of the field.

The latest version of the RedCat 51 has a concealed tilt adapter, which you can use to correct any tilt in the imaging train.

Fields of view for the RedCat 51 will depend on your camera’s sensor size. For example, an APS-C size frame will give a field of view of approximately 5.4° x 3.6°. A full frame camera will give a field of view of 8.25° x 5.5°.

RedCat 51-II-U

SpecificationsContrast diagramSpot diagramLongitudinal aberrationOptical report

Filter installation 2Filter installation 1

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William Optics RedCat 51-II-U APO 250mm F/4.9 Telescope

SKU: WO-L-RC51II-U

$1,399.00

Available on back-order

✅ Expert Advice
✅ Australian Owned
✅ Lifetime Technical Support

    Need Expert Advice?

    Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

    Enquire now or call us (03) 9042 2293

    William Optics RedCat 51-II-U APO 250mm F/4.9 Telescope

    SKU: WO-L-RC51II-U

    $1,399.00

    Available on backorder

    The William Optics RedCat 51-II-U APO is a 250mm prime lens suited to a DSLR or astrocam. The 4-element Petzval lens arrangement will ensure a flat image plane, meaning no flattener is required and your stars will be sharp to the edge of the field.

    The latest version of the RedCat 51 has a concealed tilt adapter, which you can use to correct any tilt in the imaging train.

    Fields of view for the RedCat 51 will depend on your camera’s sensor size. For example, an APS-C size frame will give a field of view of approximately 5.4° x 3.6°. A full frame camera will give a field of view of 8.25° x 5.5°.

    RedCat 51-II-U

    SpecificationsContrast diagramSpot diagramLongitudinal aberrationOptical report

    Filter installation 2Filter installation 1

    Reviews

    There are no reviews yet.

    Be the first to review “William Optics RedCat 51-II-U APO 250mm F/4.9 Telescope”

    Your email address will not be published. Required fields are marked *

      Need Expert Advice?

      Visual Astronomy, Astrophotography, Microscopy and Macro Photography can be a little complicated sometimes as there are a lot of options. If you'd like to check something before you purchase just let us know and we'd be happy to help!

      Enquire now or call us (03) 9042 2293