VSD90SS The pinnacle of photo-visual telescope that keeps total usability
The pinnacle of photo-visual telescope that keeps total usability
As we focused on a total usability, the comfort of image processing after shooting is considered significantly.
Covers a large format.
Provides sharp, beautiful, and uniform star images over the entire image field.
Sharp, beautiful, and uniform star images in the center and throughout the corners of not only a full-frame 35mm, but also a large 44x33mm* format camera.
*A 36x24mm size if a reducer lens is used together.
M42 the Orion nebula and neighbor Horsehead nebula
VSD90SS f=495mm F5.5, 44x33mm large format image field, total exposure time 85 minutes
M31Andromeda galaxy
VSD90SS f=495mm F5.5, 36x24mm full-frame image field, total exposure time 115 minutes
M42 the Orion nebula and neighbor Horsehead nebula
VSD90SS with Reducer V0.79 f=391mm F4.3, 36x24mm full-frame image field, total exposure time 105 minutes
Advantage in adjustment at squaring.
Designed to obtain beautiful star images and stably.
Adopt the design that widens out a sharp focus range while staying inside the Airy disc. It helps in reducing the change in a tint of star colors and collapse of star images on the edges of the image field, even if you missed focusing adjustments little or you failed to put squaring adjustments into a corner precisely. You get round, crisply sharp, and beautiful stars images over the image field uniformly.
Above: On-axis and off-axis star images, and images in focus and out of focus (Enlarged)
The on-axis star images become enlarged rightly according to the shift of a focal point, but you can see that the stars appear with little distortion or little color change on the corners of the image field.
Abundant image circle illumination with no peripheral dimming
The 60mm image circle ensures more than 90% of the light intensity on the peripheral illumination. Because the light intensity is uniform over the entire image field, you have no compensation for the peripheral dimming at image processing, or you expect to make that image processing easy.
High-level astrophotographs with rich graduations.
With almost no optical vignetting, the VSD90SS keeps sufficient light intensity on the edges of the image field, and it allows for minimizing non-axisymmetric flares around bright stars generated by the diffraction of light. As a result, you can expect astrophotographs of a high level with rich graduations and beautiful star images without collapse across the entire image field.
Near Lagoon nebula M8 & Trifid Nebula M20 Large format
M45 Pleiades star cluster
VSD90SS f=495mm F5.5, 36x24mm full-frame image field, total exposure time 120 minutes
M33 Extragalactic nebula
VSD90SS f=495mm F5.5, 13.2x8.8mm image field, total exposure time 186 minutes
IC1396 Diffuse nebula
VSD90SS with Reducer V0.79 f=391mm F4.3, 36x24mm full-frame image field, total exposure time 120 minutes
IC1805 and IC1848 Diffuse nebulae
VSD90SS with Reducer V0.79 f=391mm F4.3, 36x24mm full-frame image field, total exposure time 120 minutes
