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Your cart is empty.Product Description
Quintuplet air-spaced lens design, including 1 piece of SD glass and 1 piece of ED glass. The central star point has an RMS radius of less than 2.5 um, and the star point at the corner is less than 4 um, showing a super fine star point.
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M67 filter thread
The front of the lens is designed with an M67 filter thread which can be connected to camera filters. convenient for daily photography.
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M67 filter thread
The front of the lens is designed with an M67 filter thread which can be connected to camera filters. convenient for daily photography.
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M67 filter thread
The front of the lens is designed with an M67 filter thread which can be connected to camera filters. convenient for daily photography.
Self-flattened design, no need to calculate specific back focus,between 50mm and 60mm connection distance, users can directly use it after the OTA is in focus.
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Optical Path
The SQA55 is a quintuplet air-spaced lens design, including 1 piece of SD glass and 1 piece of ED glass.
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MTF Chart
MTF Chart
The modulation transfer function (MTF) is a quantitative description of the clarity of the image (including resolution and contrast) of an optical lens. ln the two sets of curves corresponding to low and high frequencies. even at the edge of the full frame. the sagittal lines and sagittal lines distance of the SQA55 lens remain very small, and at the low frequency of 10LP/mm. it is higher than 0.9 overall, showing the high resolution and sharpness of the SQA55.
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Relative illumination
Relative illumination (Rl) represents the combined effect of light loss and attenuation at the corners of the lens. and the Rl curve illustrates the change in illuminance (%) across the imaging range on the sensor. illumination variations can adversely affect the image.
The SQA55 guarantees a high illumination of about 90% even at the edge of the full frame. minimizing vignettings.
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Spot Diagram
The imaging quality of the optical system can be evaluated by analyzing the distribution of the spots on the spot diagram.
The SQA55 has a central star point with an RMS radius of less than 2.5 um. and the star point at the corner is less than 4um. showing fine star point.
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ZYGO objective Chart
The ZYGO interferometer is internationally recognized as a more authoritative
instrument for testing optical lens quality. and the SQA55 test results show great star quality.
evalon desde Asturias
Reviewed in Spain on October 22, 2024
En la foto, el cometa C/2023 A3 Tsuchinshan-ATLAS en un trípode manual, una Reflex 1300D de iniciación y el enfoque manual al lado del mar en cielo no muy oscuro.Creo que el diseño de transición de milano a trípode fotográfico es genial, rápida y bienEl poner tres presas de milano te da una cantidad de opciones para tu set que es una maravillaLos frenos en enfoque y obturador!!!Para no tener un disgusto en la oscuridad.. mil gracias al equipo de diseño práctico.El servicio de venta aquí es estupendo, me ayudó más allá de lo lógico.Estoy muy contenta con este tubo,Ah!!! Y la maleta es fuerte, el tubo va muy seguro dentro y tiene varios huecos muy aprovechables para accesorios... y doble fondo para tus mapas por ejemplo.Para mí, ha sido un avance en calidad y facilidad para hacer astrofoto, espero esto ayude a quien venga buscando un poco de orientación. Un saludo. Eva
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