NGC 6530 is the cluster formed inside the Lagoon Nebula and it is surrounded by faint traces of nebulosity. I counted 15 stars, closely packed together.
Located south of Pollux, NGC 2420 is a small, dense cluster. It looks more like a globular cluster, towards the center it is not completely resolved at 36x.
M21 is found in the same visual field with the Trifid Nebula, it is a small cluster composed of a few fairly bright stars.
NGC 6704 in Scutum is 9.2 magnitude, quite a difficult open cluster. Using averted vision I have managed to see some faint stars in the cluster.
At 36x, M11 looks like a perfectly resolved globular cluster. Using 120x the stars of the cluster are somewhat better visible, but it looses much of its beauty.
In Gemini you will find M35, a large cluster rich in stars, with a rectangular shape.
IC 4703 is the cluster surrounded by the Eagle Nebula. It is dense, composed of 40 bright stars.
Collinder 399 is a spectacular cluster also known as the Coathanger, because of its shape. It is best seen in the finder scope. The cluster fits my 1.4-degree field, it is composed of eight bright stars, of which four disposed in a line. It is visible with the naked eye, a nebulous object a few degrees south of the star Albireo.
M103 is an open cluster located near Delta Cassiopeiae. It is small, I have counted a little more then ten stars.
To the west of M103 you will find three NGC clusters that share the same field. NGC 654 is small, composed of faint stars, even with averted vision it has a nebulous aspect. NGC 663 is a little larger, dense, composed of nearly 20 stars. NGC 659 is the most difficult, I have managed to see some stars only by using averted vision.
In my opinion the double cluster in Perseus ( NGC 869 and NGC 884) is the second best in the sky after M11. The clusters are composed of countless stars and both are very dense. Using 120x even more stars become visible.
Open clusters observed with a 60-mm telescope
Collinder 339 (Brocchi’s Cluster) – One of the few Collinder clusters that really looks like an open cluster. Composed of approximately ten bright stars disposed in the shape of an isosceles triangle.
M11 – Small cluster in Scutum. At low power it has a diffuse aspect. Towards the center I can see three stars.
M35 – A beautiful cluster composed of approximately 40 stars. Large and scattered.
The Hyades cluster – Best seen with binoculars. Numerous stars are visible in the finder scope.
M24 – A chunk of the Milky Way, easily observable with the naked eye.
M41 – A beautiful cluster composed of bright stars. You can find it easily, just four degrees below Sirius.
IC 4665 – Large, it barley fits in the eyepiece field. Composed of approximately 30 bright stars. It is visible with the naked eye.
Collinder 350 – It looks like an open cluster only when seen through the finder scope. 15 bright stars scattered across the visual field are visible.
M39 – Large and very scattered. Composed of approximately 40 stars, of which ten brighter ones.
M26 – Small and faint. I didn’t manage to resolve it into stars, even at high power. Towards the center I’ve seen two stars.
NGC 6940 – A large cluster, composed of approximately 100 bright stars.
The Alpha Persei Grouping – A large number of bright stars, surrounding the star Alpha Persei.
M44 (The Praesepe Cluster) – Easily seen with the naked eye. Through the telescope I’ve seen a huge number of stars, arranged as a triangle.
NGC 6633 – A very beautiful cluster, elongated shape.
M45 (The Pleiades Cluster) – A large number of stars visible in the eyepiece. Best seen with the finder scope.
IC 4756 – Approximately 100 stars scattered in the field.
NGC 869 and NGC 884 (The Double Cluster) – Both clusters are very bright and dense.
M34 – Fairly dense, composed of approximately 50 stars.
IC 4703 – The cluster associated with the Eagle Nebula. Dense, composed of approximately 40 bright stars.
M7 – Large, composed of approximately 50 bright stars. More condensed towards the center. It is visible with the naked eye.
Stock 1 – Near Albireo (Beta Cygni). Composed of 30 stars scattered in the field.