Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-14-2008, 05:26 PM   #1
Junior Member




Join Date: Feb 2008
Posts: 44
This is a test... Four 28mm Lenses

Hi Folks!

As I rediscover the joys of photography, I've been having a lot of fun buying and trying different Pentax lenses.

Today, I tried four different 28mm lenses one subject, a glare-ridden, high-contrast shot of a tractor in the snow. The lenses were:

28mm f/2.8 SMC Pentax-A
28mm f/2.8 SMC Pentax-F
28-70mm f/4 SMC Pentax-FA
35-105 f/3.5 SMC Pentax-A

Yes, the 35-105 is a bit out of the range, but it has an interesting flaw. So I'm wondering if anyone can pick it out of the bunch. All four images were shot at 1/2000 and f/4.

You can see the resulting images at:
Pentax Lens Test

Can you tell which lens produced which image?

The prize? My utmost respect ... and if you want it, my old Pentax AF-16 flash

Enjoy!
Dave

02-14-2008, 06:13 PM   #2
Senior Member




Join Date: Jan 2008
Location: Boston
Posts: 142
At web resolution they are indistinguishable, except for contrast & saturation in the two images from the zooms. Also, you didn't strip the exif info.
02-14-2008, 06:38 PM   #3
Junior Member




Join Date: Feb 2008
Posts: 44
Original Poster
QuoteOriginally posted by twinda1 Quote
Also, you didn't strip the exif info.
Ah, but that's cheating
02-14-2008, 06:44 PM   #4
Junior Member




Join Date: Feb 2008
Posts: 44
Original Poster
QuoteOriginally posted by twinda1 Quote
At web resolution they are indistinguishable, except for contrast & saturation in the two images from the zooms. Also, you didn't strip the exif info.
But wait, doesn't the embedded data tell you the focal length, not whether it's a zoom or not?

02-14-2008, 08:21 PM   #5
Pentaxian
Moderator Emeritus




Join Date: May 2007
Location: Edmonton Alberta, Canada
Photos: Gallery | Albums
Posts: 10,648
I'd agree as for the web size of the shots. Hard to take a critical look at any.
My guess as to which is which:
28mm f/2.8 SMC Pentax-F (I always found my F versions slightly overexposed)
28mm f/2.8 SMC Pentax-A
28-70mm f/4 SMC Pentax-FA ( more accurate exposure)
35-105 f/3.5 SMC Pentax-A

As for the flaw, since the shots were hand held at different angles, almost impossible to tell with a small image. Changing light could also account for any variations. Next test should be indoors with controled lighting, fixed subject, tripod, mirror lock up and cable release. That'll make this easier to assess.
02-14-2008, 08:29 PM   #6
Junior Member




Join Date: Feb 2008
Posts: 44
Original Poster
QuoteOriginally posted by Peter Zack Quote
I'd agree as for the web size of the shots. Hard to take a critical look at any.
Point well taken, but just for fun...

QuoteOriginally posted by Peter Zack Quote
My guess as to which is which:
28mm f/2.8 SMC Pentax-F (I always found my F versions slightly overexposed)
28mm f/2.8 SMC Pentax-A
28-70mm f/4 SMC Pentax-FA ( more accurate exposure)
35-105 f/3.5 SMC Pentax-A
Pretty good. Two right.
02-14-2008, 08:37 PM   #7
Pentaxian
Moderator Emeritus




Join Date: May 2007
Location: Edmonton Alberta, Canada
Photos: Gallery | Albums
Posts: 10,648
OK so I guess the 2 zooms are reversed. I know it's just for fun. My comments were only if you want to do serirous testing to see which to keep and which to sell. Of course if the intent is to join Jim King, well toss that and keep collecting!!
02-15-2008, 08:12 AM   #8
Junior Member




Join Date: Feb 2008
Posts: 44
Original Poster
QuoteOriginally posted by twinda1 Quote
At web resolution they are indistinguishable...
True, here are full-resolution close ups...

Pentax Lens Test

02-16-2008, 01:32 PM   #9
Veteran Member




Join Date: Jan 2008
Location: Southern California, USA
Photos: Gallery
Posts: 730
Hi Dave,

This is interesting for me since I'm expecting my F28mm/2.8 too
So, which one is which?

I can't tell hehehe...
Thanks for posting anyway.
02-16-2008, 09:24 PM   #10
Junior Member




Join Date: Feb 2008
Posts: 44
Original Poster
QuoteOriginally posted by HermanLee Quote
This is interesting for me since I'm expecting my F28mm/2.8 too
So, which one is which?
The answers are...

Lens A = 28mm f/2.8 SMC Pentax-F
Lens B = 28-70mm f/4 SMC Pentax-FA
Lens C = 28mm f/2.8 SMC Pentax-A
Lens D = 35-105 f/3.5 SMC Pentax-A

The 28mm F is light, sturdy and produces wonderful images. Plus, it has auto focus, a major feature upgrade. But the A offers slightly better shadow detail, which is important to me. I'm going to put several lenses up for sale tomorrow, and deciding which of these two to keep is going to be the hardest call.

Both of the zooms surprised me with excellent images, especially the 28-70, which was handicapped by being the only lens shooting wide open. I own a very small, local newspaper, and the 28-70 has become my regular "news" lens. It's light, versatile and fast enough for most of my applications.

The 35-105 is an enigma. It's terribly front-heavy, and this particular one is afflicted with either lens glue separation or fungus in the front lens element. But it takes beautiful images -- again, with excellent shadow detail. Plus, it's sturdy and reasonably fast.

Enjoy!
Dave
02-17-2008, 01:12 AM   #11
Veteran Member




Join Date: Jan 2008
Location: Southern California, USA
Photos: Gallery
Posts: 730
QuoteOriginally posted by dbuffington Quote
The answers are...
The 28mm F is light, sturdy and produces wonderful images. Plus, it has auto focus, a major feature upgrade. But the A offers slightly better shadow detail, which is important to me. I'm going to put several lenses up for sale tomorrow, and deciding which of these two to keep is going to be the hardest call.

Enjoy!
Dave
Thanks, Dave.
Personally, I like the photo A and B better for the contrast and the color. But it's my personal opinion.
You're right about the shadow on Photo C has more detail but I prefer the color and contrast of A and B.
Which ones are you selling? and how much?...just curious.
02-17-2008, 09:28 AM   #12
Junior Member




Join Date: Feb 2008
Posts: 44
Original Poster
QuoteOriginally posted by HermanLee Quote
Thanks, Dave.
Personally, I like the photo A and B better for the contrast and the color. But it's my personal opinion.
You're right about the shadow on Photo C has more detail but I prefer the color and contrast of A and B.
Which ones are you selling? and how much?...just curious.
I've posted them here in "The Photographer's Marketplace".

Enjoy!
Dave
02-17-2008, 12:09 PM   #13
Veteran Member




Join Date: Jan 2008
Location: Southern California, USA
Photos: Gallery
Posts: 730
Ouch too late. I just checked your for sale ad.
I'd like to buy your kit lens but somebody had it first.
oh well, not for me I guess
Thanks, Dave.
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!
28mm, f/2.8, f/4, images, k-mount, lens, lenses, pentax, pentax lens, pentax-a, shot, slr lens, smc
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hanimex 28mm f:2.8 - test shot chaos83 Pentax SLR Lens Discussion 14 03-10-2014 07:33 PM
28mm Lens test: Three Vivitars and Two Pentaxes Just1MoreDave Pentax SLR Lens Discussion 24 03-05-2010 02:36 PM
Best test for new lenses gfmucci Pentax SLR Lens Discussion 5 12-31-2009 08:12 PM
FA 28mm F2.8 AL - Some Test Shots legacyb4 Post Your Photos! 3 02-27-2009 07:42 AM
Pentax M 28mm f/2.8 Test Shots (with fungus) hinman Pentax SLR Lens Discussion 5 04-25-2008 07:09 PM



All times are GMT -7. The time now is 12:18 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