Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-17-2021, 05:34 AM - 1 Like   #196
Site Supporter
Site Supporter




Join Date: Dec 2012
Photos: Albums
Posts: 2,112
QuoteOriginally posted by photoptimist Quote
LOL!

Then avert your eyes around the video world with it's 1/2", 2/3", and 1" sensors. Worse than being non-metric, those standard dimensions are defined by the diameter of the vacuum tube that would be required to house the vidicon/plumbicon/saticon video circuits!

P.S. I once flummoxed a fellow engineer and devoted proponent of the Imperial system by trying to get him to explain the difference between pounds-force and pounds-mass.
Why do they specify smaller sensors as, say, 1/2.3"? Why on earth wouldn't you just say 7.7mm?

02-17-2021, 06:10 AM   #197
Pentaxian
deus ursus's Avatar

Join Date: Nov 2012
Location: Stårheim, Norway
Posts: 615
QuoteOriginally posted by ThorSanchez Quote
Why do they specify smaller sensors as, say, 1/2.3"? Why on earth wouldn't you just say 7.7mm?
And how do you read it? "One two-point-third"?
02-17-2021, 06:16 AM - 1 Like   #198
Site Supporter
Site Supporter




Join Date: Dec 2012
Photos: Albums
Posts: 2,112
QuoteOriginally posted by deus ursus Quote
And how do you read it? "One two-point-third"?
I read it as "one over two point three inches". Which is way more unwieldy than 7.7 mm.
02-17-2021, 06:45 AM - 2 Likes   #199
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 19,654
QuoteOriginally posted by ThorSanchez Quote
Why do they specify smaller sensors as, say, 1/2.3"? Why on earth wouldn't you just say 7.7mm?
Image sensor format - Wikipedia

It is based on how video cameras tubes were named.

02-17-2021, 06:51 AM - 3 Likes   #200
Site Supporter
Site Supporter




Join Date: Dec 2012
Photos: Albums
Posts: 2,112
QuoteOriginally posted by UncleVanya Quote
Image sensor format - Wikipedia

It is based on how video cameras tubes were named.
I say we just refuse to go along with this nonsense, and refer to them by metric diagonal.

Otherwise I'm switching the speedometer in my car to only read in furlongs per fortnight, and I'm going to steadfastly refuse to order coffee in anything but hogsheads.
02-17-2021, 07:27 AM - 2 Likes   #201
Site Supporter
Site Supporter




Join Date: May 2019
Photos: Albums
Posts: 4,497
QuoteOriginally posted by ThorSanchez Quote
I say we just refuse to go along with this nonsense, and refer to them by metric diagonal.

Otherwise I'm switching the speedometer in my car to only read in furlongs per fortnight, and I'm going to steadfastly refuse to order coffee in anything but hogsheads.
My friends and I measure drinks (from beer to stiffs) in Alcoholitres. It works, mostly.
02-17-2021, 08:29 AM - 1 Like   #202
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 19,654
QuoteOriginally posted by ThorSanchez Quote
I say we just refuse to go along with this nonsense, and refer to them by metric diagonal.

Otherwise I'm switching the speedometer in my car to only read in furlongs per fortnight, and I'm going to steadfastly refuse to order coffee in anything but hogsheads.
Absolutely the most sensible thing to do.

02-17-2021, 10:13 PM   #203
dbs
Pentaxian




Join Date: Jun 2010
Location: Clare Valley S A
Photos: Albums
Posts: 6,654
With the 15 you will capture the hogshead in one frame ....... at least after 2 coffee's
02-18-2021, 04:11 AM - 1 Like   #204
Site Supporter
Site Supporter




Join Date: Mar 2009
Location: Gladys, Virginia
Photos: Gallery
Posts: 23,662
QuoteOriginally posted by ThorSanchez Quote
I say we just refuse to go along with this nonsense, and refer to them by metric diagonal.

Otherwise I'm switching the speedometer in my car to only read in furlongs per fortnight, and I'm going to steadfastly refuse to order coffee in anything but hogsheads.
Well, when I'm typing, I try to keep the pressure on the keyboard to less than 2 foot pounds of pressure.
02-18-2021, 06:54 AM   #205
Pentaxian
photoptimist's Avatar

Join Date: Jul 2016
Photos: Albums
Posts: 4,636
Shall we return to fathoming what a 1.8 barleycorn lens is good for and knot good for?

Last edited by photoptimist; 02-18-2021 at 07:38 AM.
02-18-2021, 08:40 AM - 1 Like   #206
Site Supporter
Site Supporter




Join Date: Mar 2009
Location: Gladys, Virginia
Photos: Gallery
Posts: 23,662
I have to say that saying I weigh 14 stone sounds much better than saying I weight 180 lbs.
02-18-2021, 06:51 PM   #207
dbs
Pentaxian




Join Date: Jun 2010
Location: Clare Valley S A
Photos: Albums
Posts: 6,654
Read the reviews and see if that suits you ?




Suits me
02-19-2021, 02:58 AM - 3 Likes   #208
Site Supporter
Site Supporter




Join Date: Oct 2017
Location: Lancaster
Photos: Gallery
Posts: 2,861
Original Poster
QuoteOriginally posted by dbs Quote
Read the reviews and see if that suits you ?




Suits me
If we are still talking about the 15mm, I have done a sic with it this month and it is now a "top 3, keep forever and possibly be buried with it" lens. It is sensational!
02-19-2021, 03:31 PM   #209
dbs
Pentaxian




Join Date: Jun 2010
Location: Clare Valley S A
Photos: Albums
Posts: 6,654
QuoteOriginally posted by Cerebum Quote
If we are still talking about the 15mm, I have done a sic with it this month and it is now a "top 3, keep forever and possibly be buried with it" lens. It is sensational!
Yes..

Not yet ...


and Yes...
02-19-2021, 03:33 PM   #210
Pentaxian




Join Date: Feb 2019
Posts: 2,008
QuoteOriginally posted by Cerebum Quote
If we are still talking about the 15mm, I have done a sic with it this month and it is now a "top 3, keep forever and possibly be buried with it" lens. It is sensational!
Oh my. I'll have to explain that to my wife...
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
15mm, 20-40mm, 21mm, comparison, da, diffraction, edge, excuse, fish-eye, flickr, forum, hd, k-mount, landscape, lens, pentax, pentax lens, pm, post, sigma, slr lens, smc, subject, truth, view, vistas, youtube
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Architecture I'm using it wrong on purpose, not sure what I think MossyRocks Photo Critique 6 02-25-2020 07:58 PM
For Sale - Sold: 77mm Limited (black) $450 15mm f/4 HD Limited ($185) jct us101 Sold Items 2 08-14-2019 12:01 PM
Purpose of multiple focus points? mroeder75 Troubleshooting and Beginner Help 19 03-08-2019 03:47 PM
Nature First attempt at digital over exposure on purpose Asgardian Post Your Photos! 13 01-29-2019 06:33 PM
For Sale - Sold: K-5 + 18-55 + Batt Grip/3 batts, 31mm Limited, 15mm Limited, 70mm Limited Sperdynamite Sold Items 7 02-24-2012 12:07 AM



All times are GMT -7. The time now is 12:41 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top