5000 series ultra wide angle 4.7 or 30mm?

Question

did any body know what is different between 5000 series ultra wide angle eyepiece 4.7 or 30mm? i know those eyepiece can see oject sharp but like i mean which one i can see the oject bigger? 4.7 or 30mm?

but in store 4.7 is only $199. 30MM is $449 what is different the prize? if the 4.7 can see oject more bigger then why not sell for $449 instead of $199

Answer 1

4.7mm will provide much greater magnification than the 30mm. To determine the magnification you just divide the focal length of your telescope by the focal length of the eyepiece.

My telescope has a focal length of 2032mm, so a 4.7mm eyepiece would give me a magnification of about 432X where the 30mm would only give me 67X.

Edit: I believe the difference in price is just because of the physical size, and the material used to make it. It takes a lot more glass to make a 30mm lens than it would a 4.7mm.

Answer 2

Fixed focal lenses have always been thought to be better quality than zooms and they can be cheaper (although by not much because they usually have better aperture.) So after deciding exactly what it is I want to do with that lens, I would pick the focal length best fitted to my purpose and go with that. And this brings up another question: how much are you going to use this lens? I own a 24mm which I rarely use because it is such an extreme wide angle. 24 starts showing some distortion but it can be controlled somewhat by using the lens right. Anything wider than that and you're getting more and more distortion which makes those focal lengths either a highly specialized lens or a special effect that becomes tiring. The only reason I bought mine is because it was used and at a very good price. Whenever I needed anything wider I rented the lens. It only happened twice that I remember so it was a huge saving. If money is no concern always go with the best. Off brands can sometimes have some amazing lenses such as the Tamron 300/2.8 (at least way back when when I was still spending a lot of time checking out gear). I also owned an off-brand focal doubler for my Hasselblad system which was absolutely incredible. But those are few and far between and should never be considered without the thumbs-up of some serious photographer(s) or a trial of the lens. After all, the glass is a good chunk of the quality of your image. Hope that helps.

Answer 3

Hi. The larger the number of mm the more sky you will see. In your case 4.7 will give you a larger image at the expense of a smaller field. It is good to have a range of lenses.