Después del Idas Lps tengo la duda entre un corrector de coma MPCC y un reductor/aplanador de campo.
Si fuera el reductor, sería la siguiente compra para fotografía con el LongPerng 80mm.
Según he estado mirando por el foro, salen ganando los siguientes:
William Optics - 2" Focal Reducer & Field Flattener with SCT Adapter
New 2" focal reducer & field flattener for the William Optics ZS-66SD.
Achieve a super wide f/4.8 focal ratio on your ZS-66!
Works fine with all William Optics 80 & 90mm refractors as well as Schmidt-Cassegrain & Maksutov-Cassegrain telescopes.
Field flattener is optimized for APS sized chips.
This very elegant William Optics 2" focal reducer/field flattener has been designed for optimal results with the 66mm series of telescopes AND other 80 or 90mm refractors. The SCT thread on one side allows for easy use on SC and MC telescopes as well as the ZenithStar 66mm telescopes. A 2" nosepiece is also provided for use with refractors without an SCT-style rear cell.
Highlights...
APO performance.
FMC doublet design.
Reducing factor 0.8X.
Rotating T-ring thread for any 35mm camera.
Simply loosen the set screws on the side and your adapter will rotate 360º with a thumbscrew to lock it into place!
Lens-to-chip suggested distance: 56mm
Anti-reflection multi-coatings on all optical surfaces will boost transmission and enhance your astro-imaging performance
SCT thread and 2" nosepiece
y
Meade - f/6.3 Series 4000 Focal Reducer/Field Flattener
The Meade focal reducer screws onto the rear cell of SCT's, converting f/10 scopes to f/6.3 or f/6.3 scopes to f/4.
Reduces photographic exposure times by approximately 50%.
Meade Series 4000 f/6.3 Focal Reducer/Field Flattener: Threaded on to the telescope's rear cell, the f/6.3 Focal Reducer/Field Flattener reduces the main telescope's focal ratio by a factor of 0.63 (e.g. from f/10 to f/6.3). It can be used for visual work when the user desires a wider field of view, or when placed in front of a CCD imager, #62 T-Adapter or Off-Axis Guider and camera body, the f/6.3 reducer produces photographic exposure times by about 50%.
Designed primarily for f/10 and f/15 LX-series models, the Focal Reducer can also be used photographically and in CCD imaging applications with f/6.3 SCT's, resulting in an effective focal ratio of f/4.
Los dos son de precios similares. Aparte del consejo me gustaría saber que accesorios extra necesitaría.
Tengo el anillo T de la Nikon, el nosepiece de Baader de 2" con rosca para filtros ,etc. y el LongPerng. No se si necesitaría algún adaptador entre el nosepiece y el aplanador.
Un saludo,
Luis
