This is my first attempt in using the Samyang 135mm with the Star Adventurer GTI.
This subject is pretty low on horizon from my location, with significant light pollution. I also was not sure about my manual focussing capabilities and all the setup usage. So, it was just a first test. Therefore I was a bit surprised that a digestible image was coming out - also thanks to the magic of PI tools that were extracting neatly the signal from the polluted sky and BlurX deconvolution.

There are many things I have still to learn about the Samyang (and in general!), about focusing, aperture, etc.. Constructive criticism from the friends here is welcome and even encouraged - I thank you in advance for your feedback and suggestions.

*

This field is packed with a quantity of objects, some of which are real celebrities - e.g. the Pillars of Creation in M16.
I describe here below some of the less known objects as well, nonetheless extremely interesting.
Most of the info was excerpted from the gorgeous site galaxymap.org, that unfortunately seems no more actively managed, and wikipedia.

I already portrayed some of the objects in the field with longer focals: M16 The Pillars of Creation, B312 The Black Manta, M24 The Small Sagittarius Star Cloud

Sh2-54
Also called: Gum 84, RCW 167
Galactical Coordinates: (18.7°, 2.0°)
This HII region is ionised by the young NGC 6604 star cluster, which includes the O5-8V+O5-8V+O8I supergiant multiple HD 167971 and the radio source W 35. It lies, unusually, about 70 parsecs above the galactic plane within the Ser OB2 association. Ser OB2 contains over 100 OB stars with a common age of about 5 million years.
This nebula looks like a nest (Gum 84) carrying a tiny egg (Gum 85). It is on my list for future narrowband recording.

Sh2-53
Also called: RCW 166
Galactical Coordinates: (18.2°, -0.3°)
Sharpless notes that Sh 2-53 consists of "About six detached portions". The area is prominent at both radio and infrared frequencies.
Avedisova places the nebula in the complex star formation region SFR 18.18-0.30, which includes 4 molecular clouds, a methanol maser and at least 4 additional HII regions visible at radio and infrared frequencies.
It is a rare an somehow misterious object: I plan to go back to it in narrowband with a longer focal.

Sh2-48
Also called: RCW 162, Gum 82
Galactical Coordinates: (16.6°, -0.3°)
This nebula may be associated with the Scutum supershell in the Centaurus arm.
Avedisova places it in star formation region SFR 16.65-0.34 along with the molecular clouds SYCSW 164, SYCSW 164A and SRBY 52. She concludes that Sh 2-48 is ionised by the O8 V multiple star ADS 11285.
The newly discovered dense star cluster Kronberger 25 appears in the same direction as Sh 2-48, although a tentative distance estimate for this cluster of about 2000 parsecs suggests that it may be a foreground object.

Sh2-44
Also called: RCW 157, Gum 79
Galactical Coordinates: (14.2°, -0.1°)
This huge almost circular nebula is very prominent in hydrogen-alpha.
Avedisova concludes that it is ionised by the O6 V star HD 167633. Humphreys places this star in the Ser OB1 association in the Sagittarius arm.
However, several other sources give larger distance estimates, placing this nebula in the Centaurus arm, where it may be part of the Scutum supershell.

Sh2-37
Also called: Gum 78, RCW 153a
Galactical Coordinates: (11.63°, -1.78°)
Sh2-37 lies in the direction of the ionising star cluster Dias 5. It is also known as IC 1283/1284 and the powerful radio source W 34.
Sh 2-35 and Sh 2-37 are associated with a 130 thousand solar mass giant molecular cloud and appear to be part of the Sgr OB7 association. Sh 2-37 is visible through a hole in this molecular cloud. This is a very active star formation region.

Sh2-45, M17, Omega Nebula
Also called: RCW 160, W 38
Galactical Coordinates: (15.1°, -0.7°)
M17 is called also the Swan nebula, and the Lobster nebula among other names. This nebula is found in the Ser OB1 association.
It is ionised by an O4V-O4V double star system (Kleinmann's star) at the core of the massive young cluster NGC 6618 (about one million years old), which contains over 800 stars. The total ultraviolet flux is about 25 times higher than for the Orion nebula.
A large part of the nebula is hidden by a dark dust lane that runs near the central cluster and splits the main visible nebula (Gum 81a) from two attached nebulae on the other side of the dust lane (Gum 81b - IC 4706 and IC 4707).
M17 is a blister on the side of a much larger giant molecular cloud and star formation region (M 17SW) that contains 30 thousand solar masses of molecular hydrogen.
Gum's coordinates for the M 17 region are inaccurate but it is clear from his description that Gum 81a and Gum 81b actually identify the two parts of M 17 (with the dust lane between).
The star formation region G15.03-0.68 in M17 has had its distance measured precisely using radio parallax. It is 1980 +140/-120 pc, which places it within the Sagittarius arm.
M17 SW contains a strong infrared source called the KW object. This is now known to be two close and hot B stars surrounded by a cluster of 150 dimmer stars, deeply embedded inside M17 SW in an infrared reflection nebula.

Sh2-49, M16, Eagle Nebula
Also called: RCW 165, Gum 83
Galactical Coordinates: (16.8°, 0.75°)
It is part of the W 37 molecular cloud and is ionized by the NGC 6611 star cluster, which is part of the Ser OB1 association in the Sagittarius arm. NGC 6611 is dominated by the massive and superhot O3.5V+O7.5V class multiple star HD 168076, which has 75-80 solar masses and provides about half the ionising radiation for the nebula.
M16 core was the subject of perhaps the most famous Hubble space telescope image, the 1995 Pillars of Creation, that I have already portrayed it with a longer focal here.

M25
Known also as IC 4725, it is an open cluster of stars in the southern constellation of Sagittarius. The first recorded observation of this cluster was made by Philippe Loys de Chéseaux in 1745 and it was later included in Charles Messier's list of nebulous objects. The cluster is located near some obscuring features, with a dark lane passing near the center.
M25 is at a distance of about 2000 light-years light-years away from Earth and is 67.6 million years old. The spatial dimension of this cluster is about 13 light-years across. It has an estimated mass of 1,937 M☉, of which about 24% is interstellar matter.

M18
M18, also designated NGC 6613, is an open cluster of stars in the constellation Sagittarius. It was discovered by Charles Messier in 1764.
This is a sparse cluster with a linear diameter of 24 ly.
The cluster is 33 million years old with an estimated mass of 188 M☉.
Messier 18 is 4200 ly from the Earth and 21 kly from the Galactic Center. It is orbiting the Milky Way core with a period of 186.5 million years and an eccentricity of 0.02.
As I write (June 2023) it remains one of the few objects within the Messier Catalog to not have been photographed by the Hubble Space Telescope.

M24, The Small Sagittarius Star Cloud
I have already portrayed it with a longer focal here, included description.

Dark Nebula B312, The Black Manta
I have already portrayed it with a longer focal here, included description.