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01-30-2009, 03:53 AM   #1
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Who has experiance with Macro?

Hello everybody,
I need to make a photography with macro and photograpy should have than 10cm in width from what I am photographing.
I have Pentax istDL2 with standard objectiv 18-55 that is coming with photocamera.
I use some extra lens (close up +8), Abibinar Teleconverter 2x and adapter for distance between photocamera and objectiv (I dont know english word) and lamps for small photostudio.
Photograps are having 25cm width and depth sharpness is not so good.

What should I do?
Should I buy RAYNOX DCR-250?

On this page you can see result:
http://www.panoramio.com/photos/original/18344046.jpg

There is one spot in the center of picture. Does anybody knows from where it is coming from? and how can I avoid it?

Thanks in advance,
Alex

01-30-2009, 10:10 AM   #2
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Location: Rockford, Illinois
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Moved to lens discussion where you will hopefully get more response
01-30-2009, 10:18 AM   #3
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The image link (http://www.panoramio.com/photos/original/18344046.jpg) appears to be broken.

"adapter for distance between photocamera and objectiv" = "extension tube"?

The +8 diopter close-up lens or the raynox 250 will let you photograph something about 10cm away from the front of your lens; to photograph something 10 cm wide you need a close-up lens with less power (or extension tubes or maybe the teleconverter).
01-30-2009, 10:23 AM   #4
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I will try to help a little

your combination of close up lenses +8 diopters, translates into a focallength of 125mm. this is exactly the same as the rayonx DCR-250 so aside from some potential image flair problems between the multiple lenses of the close up set, you should not see much difference.

what this does is limit your present lens when at infinity focus, to a lens that can focus to a maximum distance of 125mm, or 12.5 cm.

this should meet your first requirement to focus on a subject 10cm away.

I can't see your images but anything with this set of lenses will have very limited depth of field (depth of sharpness)

to improve DOF the simplest way is to stop the lens down, shoot the smallest apature you can, from a tripod or camera stand. You will have some loss of overall lens sharpness at F22 due to difraction of light around the apature blades, but that loss is more than compensated by the increased depth of field.

It might be sueful to post a picture in the forum of what you are photographing, and give an indication of the size of the subject.

Also, can you explain why you need to be 10cm away?

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