Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-22-2015, 03:24 AM - 1 Like   #46
Senior Moderator
Loyal Site Supporter
Loyal Site Supporter
BigMackCam's Avatar

Join Date: Mar 2010
Location: Durham, England
Posts: 9,502
Original Poster
QuoteOriginally posted by stevebrot Quote
The CFO at a company I worked for once remarked, in regard to QA, "We prefer to let our fruit ripen in other people's baskets".
Ah, product development "in partnership with our customers"

11-22-2015, 04:14 AM - 1 Like   #47
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 9,249
QuoteOriginally posted by pathdoc Quote
I ever get back to Adelaide, God knows when, I seriously need to come look you up and see how you do what you do
I'm nothing special, I put my camera straps on one lug at a time...
11-22-2015, 06:53 AM   #48
Pentaxian




Join Date: Nov 2013
Posts: 4,857
QuoteOriginally posted by stevebrot Quote
That is unless you were planning on printing and put the negative in an enlarger. Grain focusing was and remains the standard. That being said, I would routinely evaluate negatives with a loupe prior to attempting an enlargement. Depending on the loupe, the magnification is about the same as viewing at full resolution on screen.


Steve
A 24M FF sensor is providing 4233 dpi, a typicall desktop screen is providing 100dpi. So a 100% crop is a displaying the picture magnified 42 times. With a 50MP this magnified 60 times.

Want to see better theses little pixels? Well you are just a slider away from 200% meaning you have 80-120X magnification.

This is quite significant. While I don't doubt a few were looking at their negative with such high level of magnification back in time, I don't think this was common usage.

Now the guy with the most basic tool ever is going to be a able to see what a 100% crop look like on his screen.
11-22-2015, 07:34 AM   #49
Loyal Site Supporter
Loyal Site Supporter




Join Date: Mar 2015
Photos: Gallery | Albums
Posts: 6,164
QuoteOriginally posted by Sandy Hancock Quote
Make sure you look me up too....
By all means. At this stage we'll be gathering to take photos of the frozen core of Hell, but you never know.

Melbourne, on the other hand, is a far easier "ask" as I have business there once a year. Only problem is weather at the departure end makes it difficult sometimes to be sure of my exact arrival date.

11-23-2015, 10:04 AM   #50
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 30,111
QuoteOriginally posted by Nicolas06 Quote
A 24M FF sensor is providing 4233 dpi, a typicall desktop screen is providing 100dpi. So a 100% crop is a displaying the picture magnified 42 times. With a 50MP this magnified 60 times.
As you said, it depends on the resolution of the display. For example, on the K-3 rear LCD full resolution is 8x. The human eye is able to resolve detail to about 1 arc-minute. I am not going to bother with the calculations as to what that might be with an 8x loupe on a light table or with a 20x grain magnifier on a 35mm frame magnified to 16"x20". The point I made was that critical evaluation of image quality is nothing new and that the usual tools provided a comparable means to measure. Anyone in the business of purchasing photos for publication as well as those selling knew how to assess quality and the standards were as high then as they are today.

As you point out, the main difference is the ease with which someone with nothing better to do might assess an image.


Steve
11-23-2015, 11:06 AM   #51
Site Supporter
Site Supporter




Join Date: May 2014
Location: Minnesota
Photos: Gallery
Posts: 1,369
I have a calendar on the wall near my desk that I use to test newly acquired lenses. I usually stand back about 10-15 feet and take several shots of this calendar including the small print to see how well the lens is rendering. I also use a clock that is hanging on the wall in my living room. If try to find a lens with a reasonable focal length to compare against the new lens. For example I'm not going to compare a 50mm lens against 100mm lens that's ridiculous. However sharpness is not the only thing to compare against, there is also contrast, color rendition and flare resistance. Once all that is settled I either keep the lens or send it back...
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!
bit, corners, da15, da21, decision, edges, f/5.6, f/8, forum, images, iq, issues, k-mount, leg, lens, lenses, lettering, lol, pentax lens, pm, post, return, slr lens, test, tests
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
If you carry two cameras, do you put your flash on the zoom or wide? enyceckk Troubleshooting and Beginner Help 10 11-09-2015 04:36 PM
What are your most used lens and what do you use them for? What lens do you have that pearsaab Pentax K-5 44 06-04-2012 09:23 AM
How do you back up your photos? (or do you?) Capslock118 General Talk 24 01-17-2011 05:46 PM
How many tripods do you own and what lenses/purpose do you use them for? gofour3 Pentax Camera and Field Accessories 17 04-09-2010 03:08 AM
Do you accept your picture is slightly blurr? raider Photographic Technique 19 01-18-2008 03:42 PM



All times are GMT -7. The time now is 10:19 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