I am considering to make a small upgrade to my kit by adding a small refractor within the 1.5 kg range for the OTA. I am still a noob in AP, but I would like to get an high(ish)-quality instrument.
I am currently using a Pentax dfa* 300mm lens on a Pentax K1. While I am very happy with it, the lens is pretty sharp (Pentax is Pentax) and that K1 sensor is wonderful, I wonder if I would benefit into using a refractor. This will be used on a Star Adventurer (guided), hence the weight limit.
Now: I am seriously considering a Takahashi FS-60CB due to it's modularity so that I could add more modules when I get a better mount, and the fact that it fits my requirements of weight and cost, which is around 1500€ for OTA + flatteners and all the panoply of accessories that usually come with Taks.
My main question is regarding the quality of this Refractor in comparison with the Pentax lens. I've seen several reviews, some praise it, some others do seam disappointed with it, but as a starter telescope (it will be my first one), will I be pleased? Or would I come back to the lens after realising that I do have more resolving power with it?
I'm attaching an image of M35 taken with the lens (I've messed up on polar alignment but managed to salvage a few frames) - will the Tak provide a better resolution? I am also not a fan, not at all, of the diffraction spikes produced by the lens, as it creates unnecessary noise on the image.
My K1 is a Full Frame. I am aware that the 0.72x reducer will produce an image circle that will encompass the sensor while turning the focal length to 256mm , but I would prefer to maintain a 300mm or higher magnification. I've heard reviews stating that they use this scope on a full frame just with the flattener attached and that it provides sharp starts until the corners - but as far as I understood, the available flatteners for this scope do not produce a suitable image circle for full frames.
I can shoot in Crop mode (APS-C size) so this might not be a problem, but Ideally I would like to use the full area of sensor, so are any other (non reducer) flattener that can provide a full image circle for FF?
To sum up, I really like the idea of having a modular instrument that can be upgraded over time (and of course that my snobbish side does love the idea of owning a Tak), but would I be disappointed?
Today is an achievement day! My first post on Cloudy Nights!
Edited by systm, 20 February 2020 - 03:17 PM.