NG photo of the day Yemen- clouds

[hacksawbob]

Velvia?
http://photography.nationalgeographic.com/photography/photo-of-the-day/clouds-valley-raymer.html
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LENS LIST

[bob955i]

Not in 1979 Bob - Velvia first appeared around 1990.

More likely Kodachrome.

[Orio]

I would also vote for Kodachrome if it was a slide - but a computer scan is manipulatable in so many ways that it becomes really an hazzard to tell what film it is (without knowing what PP was done on the image).
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ХОРИОС-61 ( ώρεος ) : Lens sana in corpore sano
www.timelessphotography.eu
www.oriofoto.net

Read list of equipment HERE

[Séamuis]

Yes it is in all likelihood Kodachrome. Kodachrome was the standard film used for NG photographic submissions at that time. (as well as many other magazines due to its long life for archival purposes.)
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6x7 / Spotmatic / Spotmatic II / Spotmatic F / Spotmatic ESII / KX / K1000 / MX / ME-F / superA / K110D / K10D / K-m
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Winder MX w/ Remote Trigger Socket / Winder ME II / Motor Drive A / Auto Bellows M Set
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6x7: SMC Takumar 90 2,8
M42: S-M-C Takumar 35 3,5 / S-M-C Takumar 50 1,4 / S-M-C Takumar 55 1,8 / SMC Takumar 55 1,8 / S-M-C Takumar 85 1,9 / S-M-C Takumar 135 3,5 / Tele-Takumar 300 6,3
K: smc-M 20 4 / smc-M 28 2 / smc-M 35 2,8 / smc-M 40 2,8 / smc-M 50 1,7 / smc Pentax 55 1,8 / smc-M 50 4 macro / smc-M 85 2 / smc-M 135 3,5 / smc-M 200 4 / smc-M 40~80 2,8~4
KA: smc-A 28 2,8 / smc-A 35 2,8 / smc-A 50 1,7 / smc-A 100 2,8 macro / smc-A 70~210 4 / smc-A 28~135 4
KAF: smc-FA 43 1,9 Limited
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PENTAX equipment, ILFORD & Kodak film
Séamuis Moore