Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-11-2011, 05:29 PM   #1
Senior Member
mojoe_24's Avatar

Join Date: Nov 2010
Posts: 214
Comparing 50mm 1:1.7 to 18-55mm kit lens?

So I decided to spend some time with my dad's old 50mm 1:1.7 lens. I took a shot and the same shot with my kit lens to compare. I know the 50mm is supposed to be soft around the focus point, but is this overly blurry?

50mm:


18-55mm:




I haven't spent time with either lens really. Most of my pictures have been taken with the 50-200mm lens that came with my kit so sorry if this is kinda common sense.

01-11-2011, 05:36 PM   #2
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,168
it's not soft it's the DOF from a wider aperture from the looks of it. the same thing that lets in more light narrows the depth of field significantly. Nice if you want out of focus backgrounds and isolating a subject .
a truer test would be to go out into good light and shoot the same thing with both at the same f stop. try shooting at say f4.0 - 4.5 which is about where the kit falls at the same focal length. the kit is at about it's best at 35-50 and f8.0 so try that as well
you should find the 50 resolves fine details better edge to edge, and for my money has a nicer colour rendition

then try shooting a contrasty subject at noon on a sunny day. the differnces will become more apparent.
the m 50 1.7 is sharper and resolves better when compared apples to apples
the above looks like the 50 @1.7 and the kit at 4.0 or
so
01-11-2011, 05:48 PM   #3
Senior Member
mojoe_24's Avatar

Join Date: Nov 2010
Posts: 214
Original Poster
Yeah, I figured I should ahve used the same aperture once I hda the images uploaded, lol. I just mostly wanted to make sure that is how the lens should be. It hasn't been used in a several years.
01-11-2011, 06:05 PM   #4
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,168
looks like it's bang on to me
it's one of my favourite lenses, but nailing the focus wide open is tough (easier than the 1.4 or a 1.2 though)

01-11-2011, 06:35 PM   #5
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,679
Understanding what depth of field is and you'll appreciate how the fast fifty will work for you.
The 50/1.7 is leagues above the kit lens in image quality, plus has the 'speed' advantage of over 3 stops of light at 50mm above the kit lens. It is well worth having.
01-12-2011, 10:54 AM   #6
Inactive Account




Join Date: Dec 2010
Location: Sheffield UK
Posts: 61
Ive been having the same problem with my smc a 50mm
01-12-2011, 11:01 AM   #7
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,168
QuoteOriginally posted by fourfivesix Quote
Ive been having the same problem with my smc a 50mm
Re Read the above it's not an issue with the lens but with an understanding of how aperture affects the in focus area
wide open you will have a very small in focus area on a f1.4-f2.0 lens, (2.8 is not much better)

do a search for DOF or depth of field for a detailed explanation (there are likely at least a dozen on the forum alone

wiki

Depth of field - Wikipedia, the free encyclopedia
01-12-2011, 12:07 PM   #8
Veteran Member
timh's Avatar

Join Date: May 2010
Location: Wales
Photos: Gallery | Albums
Posts: 445
It's ever so slightly soft, but you'll find that with pretty much every lens at a very wide aperture. It's very good though!

Most of what you're seeing is the very small slice of scenery that's in focus at f1.7 - example here (also showing what sharpening can do). Maan, I'm procrastinating today.



01-12-2011, 01:04 PM   #9
Inactive Account




Join Date: Dec 2010
Location: Sheffield UK
Posts: 61
QuoteOriginally posted by fourfivesix Quote
Ive been having the same problem with my smc a 50mm
Maybe I should have said my 50mm lens is having the same problem with me
01-12-2011, 01:26 PM   #10
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,679
QuoteOriginally posted by fourfivesix Quote
Maybe I should have said my 50mm lens is having the same problem with me
Like being flat at the best of times and soft and fuzzy in the corners?
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!
18-55mm, 18-55mm kit, 50mm, camera, kit, lens, pentax help, photography, shot, time
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Comparing DA 18-55mm AL II and DA* 16-50mm GregK8 Pentax SLR Lens Discussion 26 04-30-2011 12:46 AM
Pentax K7 lens profiles for DA* 16-50mm, DA* 50-135mm, and 18-55mm kit lenses amoringello Digital Processing, Software, and Printing 20 09-09-2010 09:54 PM
k-x lens , kit 18-55mm f3.5-5.6 AL , what 50mm f1.4 can do over kit lens? crossing Troubleshooting and Beginner Help 19 01-15-2010 03:23 PM
DA 18-55mm AL II vs DAL 18-55mm (kit lens) vs DA 18-55mm WR rustynail925 Pentax SLR Lens Discussion 10 01-08-2010 02:06 PM
Please post comparisons images between the 18-55mm kit lens, SMC A 1.7 and 2.0 50mm. shaolin95 Pentax SLR Lens Discussion 21 02-10-2008 07:39 PM



All times are GMT -7. The time now is 05:07 PM. | See also: NikonForums.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