Archived posting to the Leica Users Group, 2011/11/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I?m with Dr Ted here. I rarely use my Sekonic 308s. Sunny 16 and a bit of experience is all you need if you?re shooting B&W film. (Different story for chromes though). Best wishes, Charlie Chan Cheltenham, UK topoxforddoc at btinternet.com www.cancer-surgeon.co.uk www.charlie-chan.co.uk On 4 Nov 2011, at 23:09, <tedgrant at shaw.ca> wrote: > Piers Hemy OFFERED: > Subject: Re: [Leica] 1.8 vs. 1.4!?!? > > >> Doesn't anyone read their Gossen exposure meter manual anymore?<<<<< > > Hello Piers, > I don't recall reading it other than when the meter came out of the box. > After I figured out how to take a meter reading it didn't seem necesary > for anything, but press button needle shows f8.0 and be there! Once that > was figured out that's all that was necessary. And threw it away! > > But then I began using Leica's and never required any kind of meter after > that! :-) And still don't. :-) > > cheers, > Dr. ted :-) > > > > > >> The Lunalux, Lunalite, Lunasix F, LunaPro F manuals all include the >> following explanatory text (along with other, much more useful material): >> >> "The [meter] is calibrated in 1/3 f/stop increments with numerical >> indications at full stops. A table is included below with the actual >> numerical values of the 1/3 stop increments listed for levels from f/0.7 >> to >> f/128. Values not listed can be calculated from the formula that follows: >> >> New f/stop = (old f/stop) (square root (2) to the power (f/stop change)) >> >> For example, if you wish to stop down 1/4 stop from f/4, take the square >> root which equals 1.414 and raise it to the power .25 which is the decimal >> equivalent of 1/4 stop." >> >> The table is in the appendix, and reads as follows: >> >> .7 2.8 11 45 >> .8 3.2 13 51 >> .9 3.5 14 57 >> 1 4 16 64 >> 1.1 4.5 18 72 >> 1.3 5 20 81 >> 1.4 5.6 22 90 >> 1.6 6.3 25 101 >> 1.8 7 29 113 >> 2 8 32 128 >> 2.2 9 36 >> 2.5 10 40 >> >> To make sense of that table, you will of course need to have a >> non-proportional font. >> Doesn't anyone read their emails in plain text anymore? >> >> Piers >> >> -----Original Message----- >> From: lug-bounces+piers.hemy=gmail.com at leica-users.org >> [mailto:lug-bounces+piers.hemy=gmail.com at leica-users.org] On Behalf Of >> George Lottermoser >> Sent: 03 November 2011 18:31 >> To: Leica Users Group >> Subject: Re: [Leica] 1.8 vs. 1.4!?!? >> >> >> On Nov 2, 2011, at 5:32 PM, Mark Rabiner wrote: >> >>> I looked up f 1.8 vs. 1.4 thinking it was between a half and a quarter >>> of a stop and they are saying its 2/3rds!?!?! Anybody know that that's >> true? >>> >>> Where is there a photo calculator that tells you these things?!?!? >> >> I always thought the basic math for 1 f stop revolved around a factor of >> 1.4. >> 1.4 x 1.4 = 1.96 >> 1.8 / 1.4 = 1.29 >> >> so - yes - 2/3 would seem close enough for. what? I'm not sure. >> >> Regards, >> George Lottermoser >> george at imagist.com >> http://www.imagist.com >> http://www.imagist.com/blog >> http://www.linkedin.com/in/imagist >> >> >> >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information