Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-18-2007, 12:03 PM   #1
Site Supporter
dawsonjm's Avatar

Join Date: Sep 2007
Location: Boardman, Oregon
Photos: Gallery
Posts: 106
Sears Auto Macro f 2.8 135mm

I just bougt this lens, thinking that it would be a good close focus macro. It is my first ever macro. I was able to try it out last night, room lighting only, and this is what I found.
1. It seems to take a pretty sharp image, considering that I have the original focus screen on my K10D.
2. The minimum distance for focus is about 30-32 inches.
3. The maximum macro magnification is 1:5.
4. The aperature is very fast and snappy, and the glass is all clean and clear. No marks on the barrel.

My questions are:
1. Did I make a stupid lens desision?
2. Is there anything that I can do to make this take 1:1 or 1:2 photos?
3. I have read about tubes, and seen pictures of add on macro lenses, but I don't know if they are applicable to a lens like this.

By the way, this has a normal focus ring, and an additional ring at the front of the lens for macro focusing.

Any help would be appreciated.

John

12-18-2007, 12:32 PM   #2
Senior Member




Join Date: Jun 2007
Location: Redmond, Oregon
Photos: Gallery
Posts: 228
I've got this lens...it's not a true macro lens, just a close focusing one.

Stupid Lens Decision? Depends on whether you like the lens and how much you paid...I got mine for...umm...around $8.00 or so if I remember rightly. I like it, but haven't had much chance to use it yet.

For 1:1 or 1:2 you'd need extension tubes or some such, there's some macro lens threads around that have specificics.

The second "ring" at the front I think just changes the focusing ranges, acting like a focus limiter.
12-18-2007, 01:23 PM   #3
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,314
I saw one of these for $10 at the last Toronto Antique camera show, but passed because I really wanted the SMC 135 f2.5, which I got last weekend, (for about 10 times this price)

If you want to get 1:2, simple math suggests you need a set of extension tubes, adding up to 67.5 mm Interestingly enough my set of 3 vivitar auto extension tubes add to 68mm. (26+20+12) so that is possible.

As others suggested, it is really a question of what you paid, but with the right extension tubes you get 1/2 life size and a reasonable working distance due to the focal length.

If you want 1/2 life size without the fuss of extension tubes, try an SMC-M 100mm F4. It does 1/2 life size with its own focusing, and gets beyond life size with extension tubes
12-18-2007, 04:48 PM   #4
Site Supporter
dawsonjm's Avatar

Join Date: Sep 2007
Location: Boardman, Oregon
Photos: Gallery
Posts: 106
Original Poster
Thank you both for the suggestions. I will probably get the extension tubes next month, and will try them out. I have read about them, but really didn't(don't) know how they work. I have a 55mm f 1.7 that should also work well with them.
John

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!
focus, k-mount, lens, macro, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Manual Sears 135mm f2.8, Sears 80 - 200mm f4.0 Macro, Takumar Asahi 28-8 (Worl vytas Sold Items 5 10-08-2010 04:13 AM
For Sale - Sold: Sears 135mm f2.8 macro ivoire Sold Items 2 01-04-2010 07:49 PM
For Sale - Sold: Sears A 135mm f/2.8 Macro aerodave Sold Items 2 12-31-2009 09:55 AM
Sears 135mm f3.5 Macro vs Takumar 135mm f2.5 mrpackerguy Pentax SLR Lens Discussion 1 10-20-2008 01:36 PM
For Sale - Sold: SEARS AUTO Multi Coated 135mm F/2.8 mummy Sold Items 5 06-15-2008 09:22 AM



All times are GMT -7. The time now is 10:24 AM. | 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