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03-08-2011, 06:07 PM   #16
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Thanks once again guys,
as soon as I have some free time I will try your suggestions

03-09-2011, 08:23 AM   #17
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QuoteOriginally posted by sergysergy Quote
Hi all,

Now that I have had my Kx (and 1st DSLR) for a while I feel like trying new things.

I have seen people talking about reversed lenses to get macro shots. I have a 18-55mm and a 55-300mm (kit lenses) plus a M 50mm f1.7 . Is there any cheap combination of lenses + adapters / extension tubes that may serve for this purpose at all?
I am not looking for anything fancy, just an alternative to expensive macro lenses to experiment with...

Thanks beforehand,
S
I have the same M 50mm f1.7 and bought a cheap (under $5 shipped) reversing ring on ebay. Here's three pics of it on my K-7.







And here's a sample macro image taken with this setup:



As you can see, you can make do with what you have by just grabbing a cheap reversing ring. After that you could spend more money on other options, but I'd recommend starting with a cheap ring for starters.
03-09-2011, 07:11 PM   #18
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cool pic!, thanks HEEGZ
03-09-2011, 08:56 PM   #19
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QuoteOriginally posted by HEEGZ Quote



As you can see, you can make do with what you have by just grabbing a cheap reversing ring. After that you could spend more money on other options, but I'd recommend starting with a cheap ring for starters.
Just make due? Id rather shoot with a reversed m 50mm f/1.7 on tubes than my $380 sigma 105mm macro any day of the week . Check my flickr and just about every macro on there is with that setup. Im on my droid x so I can't post any samples.

QuoteOriginally posted by sergysergy Quote
cool pic!, thanks HEEGZ


03-09-2011, 10:17 PM   #20
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QuoteOriginally posted by yeatzee Quote
Just make due? Id rather shoot with a reversed m 50mm f/1.7 on tubes than my $380 sigma 105mm macro any day of the week . Check my flickr and just about every macro on there is with that setup. Im on my droid x so I can't post any samples.
Yeah I guess it was a bit tongue in cheek.
03-26-2011, 12:37 AM   #21
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should these two do the job to reverse the 50mm 1.7?

tubes:
Macro Extension Tube For Pentax PK K20D K10D KM K200D - eBay (item 220636262909 end time Apr-08-11 01:45:09 PDT)
ring:
49mm Macro Reverse Adapter Ring for Pentax K PK Mount | eBay

just making sure I got the idea right....
thanks!
03-26-2011, 01:01 AM   #22
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the reverse ring looks right, and i have never used extension tubes so i cant say for sure on those.
03-26-2011, 01:22 AM   #23
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QuoteOriginally posted by sergysergy Quote
should these two do the job to reverse the 50mm 1.7?
...
just making sure I got the idea right....
Yes, those are exactly the right tools.
Yes, you got the idea exactly right.

Just be aware that you'll be working REAL close.
Will your subjects run off if a lens comes within 50mm / 2in?

Here is a trick: When you get the tubes, set aside the lens-base section, the piece that clicks into your camera mount. Sand- or file-off the black paint on that section, in the area that covers the camera-mount electrical contacts. Now, when you use your macro setup with the tubes, you'll safely short-out those contacts and thus enable Catch-In-Focus (CIF). Do the same with the mount-reversal ring, for when you use it alone and not the tubes. CIF is very useful when shooting handheld macros.

There is a common trick for enabling CIF on K- or M-type lenses, which is to put a bit of metal foil or tape on the lens base, to also safely short-out those contacts. DO NOT DO THIS WITH TUBES NOR REVERSAL RINGS!!! Tape and foil are thick enough that tubes or rings will jam on the mount! Remove paint; don't add foil!

03-26-2011, 02:23 AM   #24
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thanks again guys!!!
04-23-2011, 01:31 PM   #25
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ok, I have all the materials and I made it work (even the focus trap by removing the paint ). When it asks for the input focal length...is it still 50mm if I am using the 50mm 1.7?
04-23-2011, 01:41 PM   #26
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QuoteOriginally posted by sergysergy Quote
ok, I have all the materials and I made it work (even the focus trap by removing the paint ). When it asks for the input focal length...is it still 50mm if I am using the 50mm 1.7?
I just put 50mm, but I shoot with a flash so thats largely irrelevant as is the shutter speed
04-23-2011, 02:20 PM   #27
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thanks yeatzee,

also, is there any way for catch in focus to work with a big f number? for me it only works from 1.7 to 4 and it gives me a very small DOF...
04-23-2011, 02:26 PM   #28
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QuoteOriginally posted by sergysergy Quote
thanks yeatzee,

also, is there any way for catch in focus to work with a big f number? for me it only works from 1.7 to 4 and it gives me a very small DOF...
I've never used CIF before
04-23-2011, 06:07 PM   #29
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I always put in 50mm when reversing my 50mm f1.7 lens. I have never attempted to use CIF either.
04-24-2011, 03:18 AM   #30
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QuoteOriginally posted by sergysergy Quote
also, is there any way for catch in focus to work with a big f number? for me it only works from 1.7 to 4 and it gives me a very small DOF...
In a word: NO. I find that on my K20D, there is a CIF limit between f/8-11. Up to f/8, CIF almost always works. Beyond f/11, CIF almost never works, especially if the subject isn't BRIGHTLY lit. Also, CIF doesn't always work between f/4-8 unless you have a zone of strong contrast. Trying to trap-focus on a low-contrast, featureless surface, fails.
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