Which Phase-Fresnel telephoto primes would you buy?
Nikon's 2018 patent lists a 400, 500, 600 PF of 22cm, 28cm & 33cm length, respectively. All listed as f5.6. These lengths include the 46.5mm throat depth of the F-Nikon mount.
300 f4E PF = 755g 148 x 89mm; 77mm filter on 75mm window
500 f5.6E PF = 1460g 237 x 106mm, 95mm filter on 89.3mm window
400 f4E FL = 22cm TL; 100mm window
600 f5.6E FL = 33cm TL; 107mm window
So we could see a 600 f5.6E PF of approx dimensions of 330mm x 112mm. It could weigh <2kg. In an interview soon after releasing the 300 PF, three of its designers admitted the goals were challenging to meet. However, they succeeded again with the widely popular 500 PF. There appear to been challenges in yield of the foundry making the 90mm diameter phase-fresnel elements, but availabilities of this prime have improved since last year.
It also has been mentioned by a Nikon engineer they had planned PF camera lenses earlier: “….Mr. Fujie was active in many fields, not only with photographic lenses, but also with viewfinder optics and device optics. He also took the initiative in the development of PF lenses, though none of these lenses were ever released.” https://imaging.nikon.com/history/story/0057/index.htm
Which Phase-Fresnel telephoto primes would you buy?
Nikon's 2018 patent lists a 400, 500, 600 PF of 22cm, 28cm & 33cm length, respectively. All listed as f5.6. These lengths include the 46.5mm throat depth of the F-Nikon mount.
300 f4E PF = 755g 148 x 89mm; 77mm filter on 75mm window
500 f5.6E PF = 1460g 237 x 106mm, 95mm filter on 89.3mm window
400 f2.8E FL = 22cm TL; 100mm window
600 f5.6E FL = 33cm TL; 107mm window
So we could see a 600 f5.6E PF of approx dimensions of 330mm x 112mm. It could weigh <2kg. In an interview soon after releasing the 300 PF, three of its designers admitted the goals were challenging to meet. However, they succeeded again with the widely popular 500 PF. There appear to been challenges in yield of the foundry making the 90mm diameter phase-fresnel elements, but availabilities of this prime have improved since last year.
It also has been mentioned by a Nikon engineer they had planned PF camera lenses earlier: “….Mr. Fujie was active in many fields, not only with photographic lenses, but also with viewfinder optics and device optics. He also took the initiative in the development of PF lenses, though none of these lenses were ever released.” https://imaging.nikon.com/history/story/0057/index.htm
Aug 03, 2020 at 09:00 AM
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