Peter,
do you want to show us the achromat's color fault clearly now? ok-
Pic 1: clearly shows the chromatic aberration
Pic 2: 2 inflated blurred stars
Pic 3: fine stars, right to the center
Hallo Dimitry,
the EQ-2 described as the "parallactic mount" is a little bit... not really funny to use. It carries the Mak purely from the weight, but is not really stable and wobble-free
greatings
Stefan
Hi Dimitry,
yes, the Mak collects slightly less light through the obstruction, secondary mirror and hole in the mirror overlap, so the loss occurs only once. Also the contrast transmission is reduced a bit.
With the fast f/5 achromat, however, the color error in terms of contrast transfer is more pronounced. So you have a small gain in light gathering ability, but a bigger disadvantage in contrast.
Schau mal auf den Link- da wurden solche Achromaten vermessen http://interferometrie.blogspot.com/
greetings Stefan
Hi Dimitry,
the StarQuest 102 refractor will not show a better contrast on planets than the 102 Mak, this is prevented by the inevitable color error of such a fast achromat.
Such a refractor should only be used for overview observations, the maximum good usable magnification is up to about 60-80x. Planets are still shown very small with 60-80x, but higher magnification leads increasingly to blur due to the chromatic aberration.
greetings
Stefan
Hello, Dimitry,
welcome to Astrotreff.
Have a look at this Dobson, it has a slightly longer focal length and is therefore more comfortable to look at.
https://www.intercon-spacetec.…on-teleskop-150/1200.html
Best regards
Stefan
