Officina Stellare Veloce RH 250-AT F/5.6
The Officina Stellare Veloce RH 250-AT is a special version respect rest of Veloce series. It’s not f/3 open, but f/5.6. Because this telescope was designed for a scientific project and its performance were so good we decided to put into production. Only consider stars with 3.6 micron spot size not on axis, but on field edge: this gives you the measure on how much powerful is this telescope. If you are looking for an amazing detailed optic, RH250 is your choice.
Our brand new Veloce RH 250 F/5.6 Riccardi-Honders astrograph represents one of the true innovation in optics of the past few years. Born from the intuition of the Italian designer Dr. Massimo Riccardi as a variant of the original Honders design, this new configuration achieved the purpose of combining a fast F/5.6 focal ratio with a flat, DIFFRACTION LIMITED TO THE EDGE, very large diameter, 60 mm imaging field. In addition to these amazing optical performances, the Veloce RH 250 instrument is distinguished by an impressive compactness, unique in its kind, making them very easy to transport and easy to install on typical amateur mounts. The Veloce RH 250 is the perfect instruments for those astroimagers who are searching for a very large, corrected, field. Large nebulas or stars field will be deeply reproduced with very high resolution and full details. The intermediate focal lenght of the RH 250 make it really versatile and perfect for the great majority of deep sky wonders. In addition, this less critical F/ratio gives to the astroimager a new ease of use, ease of collimation and alignment of the field.
The back surface reflection of the primary mirror (called Mangin) is the main characteristic distinguishing the Riccardi-Honders optical design. Combining the reflecting and double refracting action (the incoming light passes twice through the full thickness of the primary mirror) of this element it is possible to obtain a greater optical correction while maintaining the instrument extremely compact. The optical design includes a full aperture corrector plate and it is completed with a two element flattener group situated before the focal plane. This complex optical system guarantees to the astroimager a greater off-axis correction even with a fast F/5.6 focal ratio.
Thanks to the most recent optical and mechanical design software used during the develop, the Veloce RH 250 has a very stable focal position versus temperature shift during imaging sessions, an essential condition when using instruments with such a fast focal ratio. All the mechanical parts are produced using only the finest materials available, such as special lightweight aluminum/Ergal, stainless steel and bronze. The tube is designed and optimized with CAD and computer support modelling to achieve the best rigidity and lightness. All parts are full CNC machined to guarantee the best possible precision. The high resistance anodization is chosen for unbeatable resistance to environmental conditions. Absolutely innovative in the Veloce RH 250 astrograph is the special splitted double stage layout of the internal light baffle. This solution make possible the dream of a completely protected versus stray light large field and a fast focal ratio, keeping low the total obstruction of the system. Finally, the very long extraction of focal plane position allows to use complex imaging trains, both with CCD or the more popular digital reflex cameras.
Overview “RH Veloce” SERIE
The RHVeloce is a really unique design, and uses several unique solutions, created by Riccardi and Honders (from this the “RH” in the name). The RH Veloce uses a double front lens that is weakly convergent, and the primary mirror is a “Mangin” mirror (from the name of its French inventor). A Mangin mirror is a mirror that is coated on the back surface, not on the front. The light passes through the glass, is reflected by the coating and then passes again through the glass. For this reason, a Mangin mirror is called a refractive-reflective optical element, and opens exciting possibilities to optical engineers. This complex design includes also a corrector group before the focal plane, achieving performances impossible otherwise, with extraordinary “fast” photographic performances over wide focal planes.
A curiosity about the RH Veloce: since the double frontal lens is convergent, the Mangin mirror is smaller than the “nominal” diameter of the scope, while the meniscus itself is bigger than the nominal diameter, to ensure a good illumination over the wide field of view of such scopes. For example, the 200 mm model has a 220 mm meniscus and a 190 mm primary mirror. The secondary mirror is a separated piece of glass, or it is made coating the middle of the meniscus, depending on model.
For this reason, we talk about “entry pupil” and not “primary mirror diameter”, for this instruments.
The original RH Veloce series was only three models (200, 300, 350mm). The 250 model was designed for a specific application, but we were so happy about it to put it in production. It is f/5.6, not f/3.
The RH Veloce frontal lens is the only piece of optic in our production that we outsource. It is made in Germany under Officina Stellare specifications.