ricardo

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ricardo last won the day on 27 Marzo

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  1. Hola Nori, hago la aclaracion que ninguna de las dos son CCD, ambas son CMOS. Saludos y buenos cielos!
  2. Ojo, no siempre es unicamente aberracion esferica en los refractores, podes tener astigmatismo, aberracion cromatica, etc.. y en los newton tambien tenes otros defectos posibles, no siempre es coma. Perdon por el off-topic Silvio pero si te compras un corrector de coma no te va a servir... Abrazo
  3. Todos anotados. Recuerden avisar si tienen que cancelar por favor Saludos
  4. Me imagine que estaba cropeada... ya que no solo es un tragaluz sino te da un campo infernal. Sacalo al campo!!! Abrazo
  5. Curvatura de campo = aplanador de campo coma = corrector de coma.. An air spaced doublet will normally be coma free even at f/5. If the edge of the field is not sharp, there are three possible causes. The most likely is field curvature. A 100mm f/5 telescope will have a radius of curvature of the field (RC) equal to about 1/3rd of the focal length. This means that the RC of your scope is about -166mm. Now considering that a C8 has an RC = 270mm and these scopes are considered to have meaningful field curvature, you can see that your scope is much worse by comparison. Next is field curvature of the eyepiece. Here, it gets complicated. If the telescope has field curvature and the eyepiece has field curvature, the results depend on how these curves work with or against one another. If the eyepiece has an opposite curve, the two can work together to cancel each other out. If the fields are curved the same way, they can work together to make it worse for you. If the field of the eyepiece is relatively flat (and in most cases, eyepieces have far flatter fields than the telescopes they are used in) then mostly what you see is coming from the telescope. And what you are seeing is astigmatism from the eyepiece, but not because the eyepiece itself has astigmatism (and even the very very best eyepieces have some astigmatism but because you are seeing the blur of the eyepiece formed image out of focus, making it easier to resolve the astigmatic blur from the eyepiece. What to do? Field curvature can be counteracted most effectively by lowering magnification. The longer the focal length of the eyepiece for a given true field size, the harder it will be to see the curvature. For example, if you used a 22mm Nagler, the magnification at the edge of the field would be higher than with a 27mm Panoptic, making it easier to see the blur of the astigmatism from the eyepiece (which is out of focus at the edge of the field) in the Nagler. Both eyepeices give about the same size true field, but the lower magnification of the Panoptic makes it more difficult to see that the outside of the field is not in perfect focus. Simple. Lower magnification does not allow the blur to grow in size enough for your eye to see it. If you are using 68 degree eyepeices, try going to a 58 degree eyepiece with the same size true field, again, reducing the magnification at the outside edge by lowering the power. The next thing you can do is to see if you can visually accommodate some of the curvature. Try focusing half way out in the field. If you are a younger observer, this will reduce the size of the blur at the outside of the field making stars look sharper there, and your eye's own ability to refocus will allow it to refocus the center of the field automatically when you move your gaze from the outside do the center of the field. Last, you can buy a field flattener. Field curvature is to me a serious issue with smaller refractors because it makes it hard to get a field that is super sharp from one side to the other using modern ultra wide and super ultra wide eyepieces. Anyway, not coma you are seeing. Air Spaced doublets are corrected for coma. Aberracion esferica.. estrellas ELONGADAS en los bordes Coma.. estrellas con forma de cometa en los bordes Son dos defectos que facilmente podes inferir mirando la imagen.... Saludos y buenos cielos!
  6. La tierra es inevitable en un diseño newton, si no entra por atras va a entrar por la boca del tubo....Podes colocar un fieltro pero no se si te va a complicar el flujo de aire... Ahora que la limpieza no es un tema complejo ya que lo hiciste bien, no me preocuparia... Saludos y buenos cielos!
  7. Como comenta Diego, esperaba muchisimo mas campo con un 20 cms y f2.1, salvo que el sensor, que desconzco, sea bien pequeño. Podes postear una foto de como queda el hyperstar con la camara colocada ? Hay algo que esta obstruyendo y genera unas estrellas con destellos irregulares. Con f2.1 no necesitas guiado! Saludos y buenos cielos!
  8. Muy buena captura Silvio! No es coma, es curvatura de campo lo que se ve, y en un refractor corto es mas evidente. Ojo, corrector de coma para corregir curvatura de campo no es lo indicado, sino un aplanador de campo, y si es especifico mejor. Saludos y buenos cielos!
  9. Los invito a recorrer el sitio donde se puede recorrer parte de la galaxia de Andromeda hecha por el Hubble. Es una foto de altísima definición, donde se confunde al principio el ruido por.. zoom mas zoom maximo zoom, si, son estrellas! Otra zona Para ver la imagen de la NASA sigan el siguiente enlace http://www.spacetelescope.org/images/heic1502a/zoomable/ Espero les guste! Saludos y buenos cielos!
  10. Hola Gabriel El problema de las fundas a mi entender es que al no llegar al piso, si llueve la humedad te haria estragos al quedar atrapada. Opciones que se me ocurren, hacer un pier semi desmontable, reemplazando el tripode, de tal forma que el tubo o cabezal ecuatorial los puedas proteger. Yo tengo DENTRO del observatorio al equipo protegido con una funda de moto, ni a ganchos es similar al tubo pero lo cubre bastante. La interperie y los telescopios no son amigos... Abrazo
  11. Muy buena Dany, me gusta mas la primera, sera por el tamaño, no le veo porosidad! Abrazo
  12. Terrible foto Ignacio, ese tubo se las trae! Abrazo
  13. Impresionante Lean, adhiero lo del color, pero en detalles, superlativa Abrazo
  14. Impresionante Dany... de lujo