Strength of N1-CL1 Closeup Lens?

Started Dec 5, 2013 | Questions
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Stephen Barrett Contributing Member • Posts: 682
Strength of N1-CL1 Closeup Lens?

What is the strength of the N1-CL1 closeup lens?
The Nikon specs don't supply this information and I haven't been able to calculate consistent values from the information that Nikon does provide.

Would somebody please do the following measurement:
Hold the N1-CL1 near a wall to get an inverted image of something outside an opposite window and then measure the distance from the lens to the wall (in millimetres) to get the focal length.

(Diopter = 1000 / focal_length)

Thank you,

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DesertCat Contributing Member • Posts: 660
More info from press release

It may not answer all of your questions, but some of the press release materials say it offers ~3.8X magnification.

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Stephen Barrett OP Contributing Member • Posts: 682
Re: More info from press release

Thanks DesertCat, but I would like to get a strength comparison with other closeup lenses. I think the 3.8x is an "effective" magnification but that the actual magnification is 1.4x when considering the 2.7 crop factor.

I tried using the minimum focus distance of 0.24 m together with the 1 m minimum focus distance of the 30-110 mm lens:
1/.24 = 1/x + 1/1 ==> x = .316 m = 316 mm ==> 3.16 diopters

When I do the same thing for the10-30 mm lens (min focus = 0.2 m) and min focus with the N1-CL1 attached is 0.09 m:
1/.09 = 1/x + 1/.2 ==> x = .164 m = 164 mm = 6.1 diopter

The two calculations are not consistent with each other, probably because the formula isn't accurate unless you use the correct reference points for the focus distances.  So I can't trust the formula and Nikon's "effective magnifications" at minimum focus do not help either.

Usually for closeup lenses, the specs include a diopter value. Why doesn't Nikon provide one?
The maximum magnification of a closeup lens usually occurs for infinite focus of the camera and, in that case, the working distance for the closeup lens is its focal length. It sounds as though Nikon is saying that its Nikon 1 system is different and that its maximum magnification occurs at minimum focus.

The only thing I would trust now is a direct measurement of the N1-CL1's focal length.

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samfan Contributing Member • Posts: 953
Re: More info from press release

My guess is that the 3.8x is just a multiplicator of magnification of the underlying lens.

I.e. if the lens has 0.3x magnification, then with the closeup gadget it should have 1.14x. But I'm just guessing. Either way magnification of the lens has nothing to do with the crop factor.

I also think at 50 eur it's rather pricey. For a price not much higher, one can get a 1) an adapter from N1 to any mount 2) a reverse ring for said mount, 3) a 50/1.8 lens for said mount. Some great macro right there and a 50/1.8 lens for telephoto use to boot.

_sem_ Veteran Member • Posts: 4,822
Re: Strength of N1-CL1 Closeup Lens?

N1-CL1 is a single-element close-up; its main selling point is the 40.5mm diameter directly matching certain N1 lenses. Better get a good achromat closeup and a step-up ring, any diopter you fancy.

nuke12 Senior Member • Posts: 1,679
Re: Strength of N1-CL1 Closeup Lens?

This is not a bad lens for the price. You just need the ring(s) to adapt 52mm down to 40.5mm.

It's much better then the cheap close up lens sets.

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