PIX 2015

There is no magical size/weight advantage

Started Mar 5, 2014 | Discussions thread
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Contributing MemberPosts: 635
Re: There is no magical size/weight advantage
In reply to olyflyer, Mar 5, 2014

olyflyer wrote:

MattZisk wrote:

olyflyer wrote:

MattZisk wrote:

Thanks, IVN. I loaded the blog page linked on Nikon rumors in Chrome and translated it (see HERE). There is an example provided that includes size and (if I am reading it correctly) suggests this example lens would be about 9-10 inches in length, which is about double the length of the current Nikon 70-300. The blog page reads:

  • Patent Publication No. 2013-210475
    • Publication date 2013.10.10
    • Filing date 2012.3.30
  • Example 1
    • Focal length f = 72.10-135.70-291.00mm
    • Fno. 4.13-4.5-5.77
    • Angle of view 2ω = 13.0-6.9-3.2 °
    • Image height Y = 8.19mm
    • 229.4-235.8-234.5mm in total length
    • 20 pieces of 13-group lens configuration
    • Six ED glass
    • Three fluorite

At least the length is definitely wrong there. The length of the FX version is 140mm at 70mm FL and 190mm at 300mm FL and I doubt that the Nikon 1 version would be longer, in fact, I'd say it's impossible.

I'm not confident enough to say "impossible" but I agree, it casts some doubt on this patent application as representing what may be in development (I edited my earlier post to add a bit more information I garnered from the application, itself, which may cast further doubt on the correspondence between patent application and actual lens for the N1 -- the numbers quoted in teh blog are what are found in the application, by the way).

I can't judge the credibility of that blog, but in my opinion it is "just a blog". There is definitely something seriously wrong with that lens data, so because of that obvious error, in my opinion, there is no credibility behind the rest of the information either. I mean, really, we are not talking about negligible differences, but at least 30-40% error in length. The guy should have checked the FX version of that lens before spreading that rumor. I don't know if the patent number is real or not, and if it exists what it contains, but until it comes from Nikon, to me this is just a general discussion.

Oly -- Keep in mind that he just quoted data from the patent application. I have confirmed that the quoted data is in the application.

One note of interest on the application that may explain the aberration (and further suggest that the application is not really commercially meaningful)  -- the abstract describes the application of a theoretical design equation that is supposed to give fewer distortions over the entire zoom range; it may be that to apply that equation, you need to do strange things to to the construction.

The translated abstract (available (HERE) states:

To provide a zoom lens with high optical performance capable of excellently correcting various aberrations including the secondary spectrum of chromatic aberration over the entire zoom range, and to provide an imaging apparatus and a method for manufacturing the zoom lens.

The zoom lens comprises, in order from an object side along the optical axis: a first lens group having positive refractive power; a second lens group having negative refractive power; and a rear group including one or more lens groups. When varying power from a wide angle end to a telephoto end, the distance between the first lens group and the second lens group changes. The second lens group comprises a plurality of lenses including a negative lens and a positive lens. At least one of the negative lenses satisfies the following conditional expressions: 60.0<νdn, and θgFn-(0.644-1.68×10×νdn)>0.000, where νdn is the Abbe number of the material of the negative lens, and the θgFn is the partial dispersion ratio of the material of the negative lens.

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