Alstar 1.25 Inch 90Degree Diagonal Prism with Optical Prism Instead Mirror | Image Clear and Sharp, 1.25 inch Eyepiece Adapter, Observe Comfortably,

The Alstar 1.25 inch 90-Degree Erecting Prism has garnered a mix of impressions from users, primarily highlighting its decent performance and value for the price. Several users have appreciated its functionality for nighttime use, particularly when observing celestial bodies like the moon and stars. However, it has also drawn some criticisms for daytime observations, especially during bird watching, where users reported the appearance of a peculiar rainbow blob in the middle of images. This effect seems to stem from the prism's limited glass coatings, leading to less clarity compared to higher-end options like the William Optics prisms. Despite these concerns, some customers have found effective ways to utilize the prism, such as coupling it with solar telescopes to minimize issues with bright light and ghost images. For those on a budget, the Alstar prism presents an acceptable choice, particularly for basic observational needs. However, more discerning users may wish to invest in higher-quality options for optimal performance. Overall, the prism serves its purpose adequately for casual users but may leave those with specific viewing preferences wanting more. **