For serious astrophotographers, an optical tube that has quality optics and suitable specifications is key to producing successful images. Astrographs come in many different specifications and designs, so each model can be oriented or preferred for a different type of imaging (eg. solar, terrestrial, deep sky etc). Some common designs include the Ritchey-Chrétien, Riccardi Honders, and Catadioptric optical tubes. Choosing an astrograph depends on how the astro-imager wants to observe, what focal length and focal ratio it has, aperture, optical coatings, and how suitable it is for the camera they intend to use.
A key specification very important to consider when choosing an astrograph is focal ratio in relation to aperture. This is an important to remember because focal ratio determines what the magnification and field of view the observor will get. Therefore, if the observor intends to mainly view deep sky objects with lower surface brightnesses, a shorter focal length will reduce magnification and increase field of view since most deep sky objects tend to appear very large but not bright. Astrograph telescopes with slower focal ratios such as an f/12 will provide higher magnification and smaller field of views; better for planetary observing.
The Takahashi Epsilon-180ED (D=180mm, F/2.8), based on catadioptric telescope design (means association of lenses and mirrors) offers a fundamental innovation compared with Newton reflector or Schmidt astrograph.... Learn MoreFREE SHIPPINGModel#: TEK0180(48 States)
Introducing the new Takahashi FSQ-106! The last rendition, the FSQ106N, has long been regarded as one of the finest refractors available for film and CCD imaging... Learn MoreFREE SHIPPINGModel#: FQK1061NUEX(48 States)
Now introducing the NEW Takahashi FSQ106! The FSQ106ED telescope features longer backfocus of 178mm to accommodate most CCD systems... Learn MoreFREE SHIPPINGModel#: FSQ106EDXIII(48 States)
Introducing the Takahashi FSQ-85ED, the newest and smallest member of the FSQ Series of flat field astrographs.... Learn MoreFREE SHIPPINGModel#: TSS0851(48 States)
Introducing the Takahashi FSQ-85ED, the newest and smallest member of the FSQ Series of flat field astrographs. Designed from the ground up for digital imaging, the Takahashi Baby “Q” is the go anywhere, portable astrograph.... Learn MoreFREE SHIPPINGModel#: FQK0085(48 States)
The innovative wide and flat imaging field, that covers 645 medium format cameras, and e 5 elements in 5 group lens design completely eliminates a violet tint in chromatic aberration (blue halo).... Learn MoreFREE SHIPPINGModel#: VSD(48 States)