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Big SLCs (1 Viewer)
- Thread starter eetundra
- Start date
Hi eetundra,
Have you received your SLC 7x42? What is your opinion about why this one is better than Leica or Zeiss 7x42? I have tried many of these high-end binoculars and the Swarovski SLC:s are my favorites. They are quite heavy but feels best in my hands. I have considered to get the SLC 8x50 but think this one may be too heavy, so the 7x42 is more attractive.
Regards, Patric
Have you received your SLC 7x42? What is your opinion about why this one is better than Leica or Zeiss 7x42? I have tried many of these high-end binoculars and the Swarovski SLC:s are my favorites. They are quite heavy but feels best in my hands. I have considered to get the SLC 8x50 but think this one may be too heavy, so the 7x42 is more attractive.
Regards, Patric
henry link
Well-known member
Ed,
I think the extra weight comes from the longer focal length eyepieces on the 7x42 SLC. They make it 17mm longer than the 10x42 SLC, all at the eyepiece end.
Henry
I think the extra weight comes from the longer focal length eyepieces on the 7x42 SLC. They make it 17mm longer than the 10x42 SLC, all at the eyepiece end.
Henry
elkcub
Silicon Valley, California
henry link said:
Yup, my little Swaro book indicates that the 7x42 is 17mm longer. Another mystery solved, Henry. :t:
The width and height of the 7x and 10x are also identical. So, if they each have the same objective, back of the envelope algebra suggests that the focal length of the objective = 396.6mm. For the 10x, the focal length of the eyepiece =39.66mm, and for the 7x = 39.66+17 = 56.66mm.
How fun. :brains:
Ed
PS. Do these numbers seem reasonable to you?
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elkcub
Silicon Valley, California
eetundra said:
eetundra,
Sorry to go off on a tangent in the last post. Actually, 7x50 binoculars are not often used for birding, more often for boating applications. A pupil diameter of 6 with a 7x42 is quite generous for low illumination viewing. In daylight the eye's pupil diameter is around 2mm and expands to 4-5mm or so as darkness sets in.
ED
henry link
Well-known member
elkcub said:
As you probably already suspect, those numbers are much too large. The objective is probably around f/4, so it would have about a 168mm focal length (probably actually closer to 160mm). The eyepiece focal lengths would be about 16.8mm for the 10X, 24mm for the 7x. I would guess that the 17mm difference in length would come from a combination of the field lens of the 7x eyepiece needing to be placed about 7mm farther behind the focal plane of the objective and an extra 10mm in the length of the eyepiece itself, mostly from wider spaces between the elements and perhaps thicker elements.
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AlanFrench
Well-known member
TTT said:
Is this during the day?
Clear skies, Alan
Otto McDiesel
Well-known member
I have a 10x50 SLC. The view is one of or the best of any 10x that i have. It's the size and weight that keep it from being used very often. The eye relief is not long enough for my eyeglasses, but i use them without glasses anyway.
Luca,
Thanks for your answer. When it comes to 10x50:s you have usually to choose between great eye relief and quite narrow AFOV and quite short ER and wide angle. Pentax 10x50 DCF SP is an example of a 10x50 which has very long eye relief (22mm) but the AFOV is only 50 deg. One "exception from the rule" is the discontinued Minolta Activa 10x50 WP FP which provide 65 deg with a stated 18mm eye relief, according to my experience adequate for eyeglasses.
Patric
Thanks for your answer. When it comes to 10x50:s you have usually to choose between great eye relief and quite narrow AFOV and quite short ER and wide angle. Pentax 10x50 DCF SP is an example of a 10x50 which has very long eye relief (22mm) but the AFOV is only 50 deg. One "exception from the rule" is the discontinued Minolta Activa 10x50 WP FP which provide 65 deg with a stated 18mm eye relief, according to my experience adequate for eyeglasses.
Patric
AlanFrench said:
I think it's the whole package that makes the view of the 10x50 SLC so much better than the 10x42. It has sligthly wider FOV, is slightly brighter (and equally sharp), has much better eye relief and is much better regarding flaring/backlight.
Patric, I don't wear eyeglasses, so I don't know.
Steve Napier
Well-known member
Arek and the Polish binoculars guys who sometimes visit cloudynights reckon the 10x50 SLC is right up there with the Fujinon 10x50,thats VERY high praise indeed.I would be interested in the 10x50SLC for Astronomy.
The 10x50 SLC has a very generous 17mm of eye relief.
Steve.
The 10x50 SLC has a very generous 17mm of eye relief.
Steve.
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