No hay artículos en el carro
No hay artículos en el carroJG
Comentado en México el 7 de febrero de 2025
Excelente reductor para roscar en el ocular.
john r.
Comentado en los Estados Unidos el 12 de febrero de 2025
High quality, does as advertised and well packaged
Tom H Texas
Comentado en los Estados Unidos el 29 de noviembre de 2024
This focal reducer screws into the nose of an astrophotography camera or 1.25" eyepiece. For visual use, it turns a 20mm eyepiece into a 40mm, both decreasing the magnification and increasing the field of view. In astrophotography, the focal reducers does that, but it also reduces the size of stars on the sensor by half, meaning you can image faster with a wider field of view. For example, an f/10 camera/scope is reduced to f/5 will image roughly six times faster (if my math is correct) because the focal reducer concentrates more photons on each well in the sensor. This focal reducer works well and gives a nice view. I highly recommend it!
Jacob
Comentado en los Estados Unidos el 6 de octubre de 2024
Works great for me. I'm using this with a 40mm 40deg eyepiece to aid with visual finding, and it works perfectly for that.
Luis
Comentado en México el 7 de agosto de 2023
Funciona, pero crea muchas "comas".
tellezrojo
Comentado en México el 22 de enero de 2022
Este aditamento es útil para tener una visión más amplia, el vidrio me parece de calidad. Se.adapta a oculares, filtros e incluso lo he podido colocar al final del adaptador para la cámara fotográfica.Quizá es mi falta de pericia, pero su limpieza se me dificulta y es frecuente que ponga los dedos en el vidrio. No me pasa con otros aditamentos. Vale la pena.
DJC
Comentado en los Estados Unidos el 2 de octubre de 2021
I bought this focal reducer with the hope that I could use it with my 6SE telescope and two digital cameras. The threads fit the 1.25" threads on my eye pieces and cameras with appropriate adapters. Fit was not a problem at all. I had no problem getting my image into focus using this reducer with the SV305 camera. However, I could not get the right distance to bring anything into clear focus using my Canon 450D dslr. I have not been able to find the right combination of adapters to make it work - I've tried. The best I could do was use an eyepiece projection adapter, but the vignette was terrible despite a focused image.This 0.5x focal reducer did increase the field of view for the sv305 camera. The center of the image is fantastic. I was able to actually use the sv305 with this focal reducer to capture smaller deep sky targets - see the photos of M2, M30 the Jellyfish cluster, and M27 the dumbbell nebula. Unfortunately the outer area suffers from distortion. Stars are elongated and chromatic distortions are present. A field flattener is needed to help correct this. Its not a fault of this particular focal reducer. Pretty much any focal reducer will have the same effect on its own.If you are looking to increase the field of view this focal reducer will work providing about a 50% increase in the field of view assuming you can get the fight focal distance. Just don't expect it to do miracles. Its not the same as the much more expensive field reducers with field flatteners and shouldn't be compared to them. For daytime images this actually works even better as the edge distortions are much less noticeable.
Thomas Fehrmann
Comentado en Alemania el 25 de septiembre de 2020
Hatte mir mehr davon versprochen,nur bedingt brauchbar.
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