"It is Impossible...." they said. "Sun's Full Disk" test with a Tecnosky 60Apo and Daystar Quark Chromosphere.

[Fedele]

"It is Impossible...."

Hoping to do something useful and pleasing to many.
Results of the "Sun's Full Disk" test with a Tecnosky 60Apo and Daystar Quark Chromosphere.
Test by Fedele De Marco and Armando Zurlo.

First part: Visual

I have recently purchased an ED FPL53 doublet refractor, 60/360 branded "Tecnosky 60 APO", with the aim of observing and imaging (ASI 178MM and 174MM) the FULL disc of the Sun with a Daystar Quark Chromosphere.
Today's test is performed both for visual and imaging, with a sky covered by clouds, in rare moment of "less clouds" around the Sun. 
The study on the backfocus and optical paths of the OTA and all the accessories used for the purpose was made by Armando Zurlo, inspired from a similar setup with achromatic 80/400 used by a user of the Cloudy Nights forum.
Accessories and parts used in the test:
- TecnoSky 60APO (60/360 Ed FPL53). here my impressions of the instrument: https://www.facebook.com/fedele.demarco/posts/10223310675989267
- focal reducer tecnosky 0.5x fitted in the 31,8 camera nose
- ZWo ASi178 MM (just for test, MUST use the 174 or similar / best for more field)
- T2 / T2 adapter 2 mm between zwo camera and Tilter
- ZWO T2 Tilter version II
- Daystar Quark Cromosphere
- Optical cap with reduction from 60 mm to 50 mm, 3D printed by - extension tubes: tecnosky 80 mm and 50 mm

Not going into the merits of the Quark quality view and limiting myself only to evaluating the solar disk dimensions, i specify again that the observations were made in a cloudy day, in rare moments when the area of the Sun's sky was relatively clear of clouds. The “quality” test is therefore postponed.

Visual Results. 

I NO LONGER REMEMBER THE VARY COMBINATIONS RESULTS ….i will repeat all soon 

- Quark inserted in the 80 mm extension and then in the 2 "focuser with TeleVue Ploss 25 mm eyepiece.

The Sun is a large disk that occupies 90% of the field. The eyepiece vignettes a little, with vignetting on about 5% along the edge of the field. The image, even if veiled, shows a lot of detail. You can see many details of the surface and protuberances. I imagine it will be perfect without clouds. Full Disk obtained. Super View

- Tecnosky 0.5 x reducer screwed to Quark and Quark inserted into the 2" fok directly through the 80 mm extension. The disk becomes half and the field wider. Success. The resolution is obviously low. Full disk obtained

- Tecnosky 0.5 x reducer screwed to Quark and Quark inserted in the 2 "fok directly without 80mm extention. NOT REMEMBER. MAYBE OK, PUBLISHED TOMORROW THE POST

- Tecnosky reducer 0.5 x + extension Tecnosky 25 mm 31.8 screwed to Quark and Quark inserted in the 2 "fok directly I DON'T REMEMBER. I think a very small disc. MAYBE OK, TOMORROW PUBLISHED THE POST

Imaging
Success. It is possible to image the Full Disk with a Quark Cromosphere and an ASI 178MM. Best with the 174MM obviously. 
Various options were tested using the ASI 178, a 31.8mm nose, a 0.5x reducer and its 25mm 31.8mm extension, the ZWO Tilt, the T2 / T2 adapter, with and without focuser extension of the 80 mm. Various disk sizes and resolutions are obtainable. In a future test I will be more precise by illustrating the various options and possibilities
I specify that to obtain an equivalent focal length valid for the Daystar Quark Chromosphere with this setup, it is advisable to diaphragm the aperture to 50 mm (see attached refractor review)

I made these tests in a very short gash between the clouds. I have taken pictures that I am attaching but many combinations now I do not remember them well. I'll do a test on the next (hopefully) clear day, writing down all possible combinations.
One thing is certain: NOTHING IS IMPOSSIBLE. Always Experiment. Thanks to Armando Zurlo for the technical support, an experience from which we both learned.
Sorry for my bad english. 
Fedele

Edited December 11, 2021 by Fedele