Re: TMB achromats + Chromacorr ?
- --- In tmboptical@y..., "luca_grella" <luca_grella@m...> wrote:
> I post this question on the TMB forum because any answer might beof
> interest to other people as well.Luca,
> I would be interested in the above mentioned combination for a
> 180/1500 achromat model. Is this possible and how much can it be
> and what color correction can it provide?
> Thanks in advance to anybody who will respond.
> best regards
The color correction will depends of which Chromacor will you
use. With standard Chromacor (or Chr-I) you will have significantly
reduced secondary spectrum (about 5-6x reduction for blue light)
and this will insure, that planets will be seen in their almost
With Chromacor-II the color correction will be on the level of
true APOs. In focus Chromacor-II shows ZERO colors on any selestial
objects with 150mm F/8 achromat. So, it has some color correction
stock for even 180mm F/8.3 achromat. May be you will see slightest
violet on such hot bluish stars like Sirius, may be not. But on
any planet you will see zero false colors.