Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-03-2013, 03:09 AM   #1
New Member




Join Date: Feb 2013
Posts: 9
Macro Lens

Hello, i am new to this forum and i wanted your opinion about something. My favorite subject is macro photography and i made quite a few good ones with an old nikon ai lens. But now i want to try the reversed lens macro tehnique and i wanted to ask you what old pentax lenses are best for this. I would like a 50mm and a 28mm sugestion. The 2 top qualities i am looking is very low CA or none and very very sharp lens. The price is not so much of a problem, i just want quality. Thank you in advance.

02-03-2013, 03:38 AM   #2
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
ps. until now i have found to buy a Sigma 28mm F2.8 Mini-Wide Macro and a Super-Multi-Coated Takumar 28mm 1:3,5. What do think about these? How is the sharpness?
02-03-2013, 04:05 AM   #3
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,957
QuoteOriginally posted by radub85 Quote
ps. until now i have found to buy a Sigma 28mm F2.8 Mini-Wide Macro and a Super-Multi-Coated Takumar 28mm 1:3,5. What do think about these? How is the sharpness?
I suggest taking a look through the user lens reviews here:
Pentax Lenses - Pentax Lens Reviews & Lens Database

Have you looked at the Pentax 35mm macro at all?

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:

02-03-2013, 04:21 AM   #4
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
thanks, it seams like a very nice lens but i can't find it in my country for sale.

02-03-2013, 05:37 AM   #5
Junior Member




Join Date: Sep 2012
Posts: 45
The M50 f1.7 is very sharp, and can usually be found used for around 100.00 US. The M50 f2 is another option and can be found for around 50.00 US. Not as sharp wide open, but very nice stopped down a couple of stops.

I have used both reversed, and it is really hard to tell any difference between the two. If I were going to pick one, I would get the M50 f1.7 because it can also be used as a nice little manual focus standard lens. You will find that it is very well made, and very very sharp with good colors and contrast. For an older lens, it will surprise you how sharp it is. They both take 49mm filters.

In 28mm, the K28 f3.5 is probably the sharpest, and can be found for 150.00 US or less. The M28 f3.5 is not quite as sharp and runs less than 100.00 US. Again, they both use 49mm filters. I kept the K28 for my personal work as it is my favorite in that focal length.
02-03-2013, 07:57 AM   #6
Loyal Site Supporter
baro-nite's Avatar

Join Date: Aug 2011
Location: North Carolina, USA
Photos: Gallery | Albums
Posts: 4,298
One of our members who does extreme macro (Nass) did some tests with the M50/4 macro lens and found that it performs very well reversed. The M50/1.7 has a reputation as an excellent lens for reversing on extension; I've done a few shots with it and found some longitudinal CA, but that was on a rather high-contrast subject. I've just been testing the M28/2.8 (older version) and it does well, but you have to stop it down to f/5.6 before it begins to really sharpen up (it's sharpest around f/11), and for extreme magnifications that means the effective aperture is small enough that diffraction is a factor even at nominal f/5.6. Since you're talking about reversed lenses I'm assuming you want to go well beyond 1:1 magnification, and that means you want to find a lens that is sharp at least by f/4, preferably by f/2.8. Yoshihiko's tests are helpful here.

The Pentax 35 macro is a DA lens with no aperture ring, so is not a good candidate for reversing.

wildimages's recommendations are good. I'll add that the M50/1.7 can often be found for quite a bit less than USD100.
02-03-2013, 08:59 AM   #7
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
Thank you, i made an order for the M50 1.7 now i have to find a 28mm (unfortunatly i can't find any k28 3.5 for sale), and yes i have made some photos beyond 1:1 but i want more beside the viewfinder is a little black f8 isn't a good aperture for reverse macro?
02-03-2013, 09:09 AM   #8
Loyal Site Supporter
baro-nite's Avatar

Join Date: Aug 2011
Location: North Carolina, USA
Photos: Gallery | Albums
Posts: 4,298
For a quick-and-dirty approximation of effective aperture, multiply the nominal aperture (the value the lens is set to) by m+1 (m=magnification). So with the lens at f/8, 1:1 magnification gives you an effective aperture of f/16, 2:1 gives f/24. By f/24 any increased sharpness from stopping down the lens is likely to be more than offset by diffraction. And as you mention the VF goes rather dark.

02-03-2013, 11:49 AM   #9
Pentaxian




Join Date: Nov 2011
Photos: Gallery | Albums
Posts: 3,615
QuoteOriginally posted by radub85 Quote
i want to try the reversed lens macro tehnique and i wanted to ask you what old pentax lenses are best for this.
The performance of a lens used in the regular position,
which is the usual topic of the reviews and opinions here,
does not always correlate to how it will behave reversed.
Quite often, lenses that are real dogs in regular use
can become very sharp when reversed.

I would suggest you do a detailed search of the forum,
with keywords like "reversed."
IIRC, @RioRico had a lot of comments about reversed lenses.
02-03-2013, 11:53 AM   #10
Pentaxian




Join Date: Nov 2011
Photos: Gallery | Albums
Posts: 3,615
QuoteOriginally posted by radub85 Quote
beside the viewfinder is a little black f8 isn't a good aperture for reverse macro?
Have you tried using live view, with a shade between the screen and your eye?
02-03-2013, 01:58 PM   #11
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
Well i hope the M50 f1.7 is sharp enough because i already order it. Now for a 28mm but i still don't know what, i will search on the forum for old posts. Here is my website if you would like to see what i did till now with 65mm extension tubes and 55mm macro lens atached to it normal (not reversed) extended to the max 1:2. But i want more
02-03-2013, 02:00 PM   #12
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
Radu Bercan Photography - radubercan.com i forgot to include it in the previous post.
02-03-2013, 02:11 PM   #13
Loyal Site Supporter
baro-nite's Avatar

Join Date: Aug 2011
Location: North Carolina, USA
Photos: Gallery | Albums
Posts: 4,298
QuoteOriginally posted by radub85 Quote
Now for a 28mm but i still don't know what
The S-M-C Takumar 1:3.5 28mm you mentioned is widely available and not expensive. There were 2 different optical formulas, neither of which is the same as the SMC Pentax 1:3.5 28mm (which has a good reputation as a reversed lens). If you can't find the K lens (they do come up from time to time, neither common nor rare) maybe the Takumar would perform well, but I haven't seen any examples.
02-03-2013, 02:18 PM   #14
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
if that smc pentax 28mm 3.5 is that good than i think i will wait a little longer for it....maybe someone will sell it in the mean time i will try the 50 1.7 i will get tomorrow
02-03-2013, 02:45 PM   #15
New Member




Join Date: Feb 2013
Posts: 9
Original Poster
is the SMC Pentax-M 50mm F4 better than 50 1.7 for reversing? sharpness i mean.
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, 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
What is a good zoom lens for reverse lens macro? dmbaile2 Pentax SLR Lens Discussion 5 08-15-2012 11:32 PM
Reverse stacking for macro onto a 100mm macro lens - 28mm good? GibbyTheMole Pentax SLR Lens Discussion 10 04-27-2012 02:56 AM
Trying to decide between 50mm Macro vs 35mm Macro Lens stl09 Pentax SLR Lens Discussion 4 07-24-2009 07:56 AM
For Sale - Sold: Tokina 90mm F2.5 AT-X Macro Lens with 1:1 Extender. A Legendary Macro Lens. Bo frank Sold Items 12 05-29-2009 05:57 PM
50mm macro lens vs 100mm macro lens. What is your experience? raider Pentax SLR Lens Discussion 7 10-28-2007 06:39 PM



All times are GMT -7. The time now is 11:56 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