Quote:
Originally Posted by Steve Pattie
Hmmm. I understand the reason for the flattener, but isn't placing lenses in the light path prone to chromatic abberations. The RC was designed for full field flatness across a large image circle without having to use correctors.
Steve
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Hi Steve
There's a wiki on this that is quite interesting.
The RC design helps eliminate coma but it's still a bugger in terms of providing a flat field. The RC8 still needs a flattener to cover say an APS-C sensor on a DSLR.
You can chose between adding a piece of glass to act as a flattener or cropping or using a smaller sensor or even tinkering with lens correction in PS. Personally I crop.
https://en.m.wikipedia.org/wiki/Ritc...ien_telescope#