William Optics RedCat 51 II APO 250mm f/4.9 Refractor Telescope

In Astrophotography Market, William Optics has recently released a new and enhanced version II of the Gen 1 and Gen 1x RedCat scopes in response to its enormous success.
The scope now has an internal focusing mechanism that keeps the dew shield stable when you change focus, which is the primary difference. That eliminates the need for dew heating strips and tangled or snagged connections. Also, the helical focuser mechanism has been enhanced.
There are no other mechanical or optical changes from version 1x aside from the aforementioned.

Quick Summary:

51mm Petzval apochromatic refractor with whole frame flat field and ultra-compact size.
Suitable for using with APS-C or full-frame DSLR, mirrorless, or specialized astronomy cameras for wide-field astronomical or terrestrial imaging
For quick and accurate setup, use the precision helical focuser, field rotator, and Bahtinov mask.
features a 48mm astronomy filter slot and M48 threading to support a variety of cameras.

Petzval Apo Refractor for Astronomical and Terrestrial Imaging: Ultra-Portable

A telescope, perhaps? Is that a lens for a camera? Are both true? Whatever you choose to call it, the new, second-generation William Optics RedCat 51 is a Petzval refractor that is sturdy, inexpensive, small, and lightweight with razor-sharp optics. It is perfect for both terrestrial imaging of birds, landscapes, and wildlife as well as ultra-wide-field image of the deep sky.

Many people consider the 250mm focal length of the RedCat 51 to be the sweet spot for astrophotography with a large field of view. The field of vision easily accommodates the Orion Nebula, Andromeda Galaxy, Heart and Soul Nebulae, North America Nebula, and many other well-known astronomical objects. Petzval-designed premium apochromatic optics are used.

Quick, razor-sharp, flat field, and large image circle

Also functional as a portable visual telescope

Field Rotator and Precise Focuser

Short Detail :

1. Focal Length: 250mm
2. Diameter: 51mm
3. Aperture: f/4.9
4. Focuser: Helical focuser
5. Image Circle: >43mm
6. Tube length (fully retracted): 228mm
7. Tube length (fully extended): 291mm
8. Dew Shield Circumference: 255mm
9. Dew Shield Diameter: 80mm
10. Weight:
    1. 2.9 lbs / 1.3kg (OTA only)
    2. 3.9 lbs / 1.76 kg (OTA with ring and dovetail)
11. Interchangeable T-mounts (sold separately): Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds, Fuji

If you are looking for great matching Astrophotography Cameras for REDCAT :