Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-04-2012, 03:25 PM   #1
New Member




Join Date: Mar 2012
Posts: 9
Best things to shoot for a lens review?

I'm trying to think of things to shoot outdoors that would best show off a lenses sharpness, CA and bokeh. Does anyone have any suggestions that they'd be willing to share?

04-04-2012, 03:32 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,233
Brick walls, test charts, and test setups. Take a look at some of our lens reviews for examples

Pentax Lens Reviews | Pentax in-depth reviews | PentaxForums.com

If you don't want to have to print a chart every time, here's a good one that we used for the Tamron 90mm comparison:
DSC Labs Pocket CamFocus Test Chart PCF B&H Photo Video

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

04-04-2012, 03:36 PM   #3
Veteran Member
joe.penn's Avatar

Join Date: Mar 2011
Location: Maryland (Right Outside Washington DC)
Photos: Gallery | Albums
Posts: 2,902
QuoteOriginally posted by srn121 Quote
I'm trying to think of things to shoot outdoors that would best show off a lenses sharpness, CA and bokeh. Does anyone have any suggestions that they'd be willing to share?
I shoot tennis nets - very contrasty and very very detailed...
04-04-2012, 05:16 PM   #4
Site Supporter
forensicscientist's Avatar

Join Date: Jun 2008
Location: DFW Texas and Maine - I commute :)
Posts: 889
How about a stop sign from 50 yards? Or 200 yards? Has sharp lettering.....or the ever exciting brick wall from various distances/focal lengths, and various f-stops.

04-05-2012, 06:31 AM - 1 Like   #5
Pentaxian
Edgar_in_Indy's Avatar

Join Date: May 2010
Location: Indiana, USA
Photos: Gallery
Posts: 2,636
Good looking women.
04-05-2012, 06:41 AM   #6
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,270
QuoteOriginally posted by Edgar_in_Indy Quote
Good looking women.
LOL, that makes the viewing of the review more interesting most definitely, and distracts from any flaws in the lens as well
04-05-2012, 06:42 AM   #7
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
The problem with "test subjects" are that they do not necessairly show real world results.

While I will admit i use uniformly lit block walls and paved surfaces to test exposure / aperture consistency and vignetting, but I post analyzed results, such as exposure vs aperture charts or light fall off as you move out of the frame, as opposed to the images themselves.

I look at shooting real subjects for much of the rest of my evaluation.

Brick walls are no good for distortion because most have some variation between courses. In fact, the lens correction plug in that i use (PTlens, who also make lens profiles for their software and users) actually will not accept shots of brick / block walls as acceptable targets, preferring steel and glass buildings.

For me, I just have an inability to translate shooting charts and targets into real image impacts on a lens.
04-05-2012, 07:34 AM   #8
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
I had an idea for a test target -- which I haven't built yet because I'm a lazy sod, but what the hell -- anyway, it's something like this:

Print a big test chart, like about 60x90cm / 2x3 feet. Cut a big hole in the middle. Mount the chart in a frame. Put a lifesize manikin's head (with a grid drawn on it) in the hole. Put a speckled-plastic sheet behind the head, and a light behind that. Illuminate the front of this assemblage from about a 45 degree angle.

Now, with one frame-filling shot, we can judge edge and center sharpness, edge distortion, center rendition, and bokeh.

Yeah, I might build this one of these days. It could happen.

04-05-2012, 08:15 AM   #9
Pentaxian




Join Date: Feb 2010
Location: Eureka, CA
Photos: Gallery | Albums
Posts: 1,980
QuoteOriginally posted by Lowell Goudge Quote
The problem with "test subjects" are that they do not necessairly show real world results.
This is true. A test subject will only show how well the lens does with that subject. But merely because a lens does well with a brick wall at ten feet doesn't mean it will do well shooting a person's face or a bridge or Half Dome. A lens may be sharper at ten feet than it is at 30 feet. Or it may have decentering problems that are only noticeable at longer distances. A lens may do fine in soft light but may really struggle in bright/harsh light. It may flare all over the place when the sun hits the lens at one type of angle but do fine at other angles. The fact is, you have to throw all kinds of "real world" situations at a lens to figure out what it can do in the real world.
04-05-2012, 08:36 AM   #10
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by RioRico Quote
I had an idea for a test target -- which I haven't built yet because I'm a lazy sod, but what the hell -- anyway, it's something like this:

Print a big test chart, like about 60x90cm / 2x3 feet. Cut a big hole in the middle. Mount the chart in a frame. Put a lifesize manikin's head (with a grid drawn on it) in the hole. Put a speckled-plastic sheet behind the head, and a light behind that. Illuminate the front of this assemblage from about a 45 degree angle.

Now, with one frame-filling shot, we can judge edge and center sharpness, edge distortion, center rendition, and bokeh.

Yeah, I might build this one of these days. It could happen.
I had an idea for a target too, but with the intent of semi real world shots so lenses could be compared without having any too shooters actually on the same continent (perhaps plant) by building a specifically specified lego land scene. that way everyone could do comparative tests (as long as th ecolor quality of lego is consistent enough)
04-05-2012, 09:05 AM   #11
Pentaxian
Edgar_in_Indy's Avatar

Join Date: May 2010
Location: Indiana, USA
Photos: Gallery
Posts: 2,636
QuoteOriginally posted by eddie1960 Quote
QuoteOriginally posted by Edgar_in_Indy Quote
Good looking women.
LOL, that makes the viewing of the review more interesting most definitely, and distracts from any flaws in the lens as well
I was obviously joking about the women, but in seriousness I do wish that the camera/lens review sites would include more portraits in their test shots; pretty women or otherwise. Two sites I read most frequently for lens reviews, DPReview and Photozone.de, always include a lot of great landscape and scenery test shots, but rarely feature portraits.

I take more portraits than anything else, so when I get a new lens, the first thing I do is starting shooting pictures of my kids, rather than shooting brick walls or test charts. A lens that doesn't seem that impressive shooting a black-and-white test chart wide open, can still produce very nice results when shooting a real-world subject wide-open.
04-05-2012, 09:10 AM   #12
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by Edgar_in_Indy Quote
I was obviously joking about the women, but in seriousness I do wish that the camera/lens review sites would include more portraits in their test shots; pretty women or otherwise. Two sites I read most frequently for lens reviews, DPReview and Photozone.de, always include a lot of great landscape and scenery test shots, but rarely feature portraits.

I take more portraits than anything else, so when I get a new lens, the first thing I do is starting shooting pictures of my kids, rather than shooting brick walls or test charts. A lens that doesn't seem that impressive shooting a black-and-white test chart wide open, can still produce very nice results when shooting a real-world subject wide-open.
I think this is where typical photos come in, not just flowers cats (pets in general) or targets, but focal length appropriate and focal length to subject distance appropriate shots.

If you are getting a lens for portraits, then it should be portraits, shot relitively close, to show how it performs. although some may want the lens for other uses, and other focusing distance shots are relevant, evaluating a portrait lens by using a landscape scene is useless. As a result the test subject needs to be changed based upon the lens's principle use.
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!
k-mount, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Point and Shoot Contest #44: Things that Fly ivoire Pentax Compact Cameras 73 08-04-2011 08:51 PM
Hasselblad H3Dll-50 Photo Shoot Experience Review benjikan Non-Pentax Cameras: Canon, Nikon, etc. 2 05-27-2011 06:31 PM
20 things I learnt on my first paid fashion shoot clark Photographic Technique 7 08-19-2010 11:46 AM
Suggestion Lens review filter Finger Site Suggestions and Help 6 08-09-2010 08:30 AM
Point and Shoot Contest #14 Favorite Things LaRee Pentax Compact Cameras 34 02-01-2009 04:29 PM



All times are GMT -7. The time now is 03:06 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