It is the diameter of the telescope’s objective lens or its mirror which is actually very important to be considered when describing the kind of telescope you are planning to buy. If you have larger diameter lenses then it would definitely offer high amount of resolution and it can help gather those lights from that of the astronomical objects. The only sad part is that they can offer a costly price. Four inches is the good size for the first telescope. It can be inconvenient to have big telescope mirror and it can be a lot more expensive too. The bigger one can work better but not shockingly so.
The magnification is not that important and it is often being hyped in the advertising claims for that of the inexpensive telescopes. In the world of astronomy, the reason for the creation of the telescope is to be able to collect those light that is from that of the faint objects and simply not to be able to magnify it. Most visual observing is done through 50 and 200 powers.
More magnification will mean useless blue will occur. The excellent rule of thumb to be able to determine the maximum usable magnification is to be able to multiply the diameter of the objective in millimeters by 2.5. In the actual practice, on the nights of the extremely unusual atmospheric stability, you may actually make use of the higher power but do not simply count into it.
It will be better also that the eyepiece can be comfortable which means it can be close to the eyes so that it will clearly see the object. Also, the eye relief can be too small that you can be able to have to bring the eyes close to the eyepiece and it can be all but impossible to be able to observe for more than a few second at a time.
Last but not the least, you need to also look for the steady mounting or that of the shaky one that can ruin the observing experience and to prevent you from adjusting that of your mount just to make it steady which can often be tasking already into your part. Thus, in general, if ever that you see that it is more massive that the mount would look like, the better that it will perform or it can offer a steady mounting. It can be best that you are going to spend more on the mount if your will be in doubt.