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05-14-2010, 09:18 AM   #61
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I don't know if i can post liks to other forums, but if there's a place I can recommend it would be this:
Macro world - Inspiring Photography Forums

This is the macro section of that forums and there are excellent people there that can help you. Here's one of the users' flickr:
Flickr: Lord V's Photostream

For a small (5-6 pages) tutorial, check out this:
Macro tips and techniques of DSLR users - Inspiring Photography Forums

The MPE-65 has around 4-6 cm working distance. Don't know how much at 2:1, varies with magnification. The MPE-65 has fame of being rather difficult to use/get used to. Get aquainted with your equipment first.

Last, learn how to focus stack (and shoot them). Most photos of the people you linked have at least some kind of focus stacking, the depth of field is so small (you know that) and diffraction hits faster so sharpness suffers a lot in macro. You will get a lot better results by focus stacking two/three pictures than putting the lens at f/16-22.

Hope you find these useful.

05-14-2010, 09:22 AM   #62
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If I can, direct you to this link...

https://www.pentaxforums.com/forums/post-your-photos/101255-macro-i-finally-d...ml#post1042849



(I am signing up for that forum as we speak)
05-16-2010, 10:44 AM   #63
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Ok, question. Do I gain anything by using my macro lens as the primary lens with the 50mm stacked?

How much magnification do i have when my 105mm lens is set to 1:1, with the reversed M 50mm focused at infinity?

Does the primary lens's minimum focusing distance greatly affect mag. when using the stacked lens method?
06-04-2010, 12:27 AM   #64
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Bumping this up, just start playing with reverse stacking lens.
Got a 6:1 ratio with a working distance of 3.6cm. But wow the dof is extreme!

06-04-2010, 01:04 AM   #65
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QuoteOriginally posted by TOUGEFC Quote
Bumping this up, just start playing with reverse stacking lens.
Got a 6:1 ratio with a working distance of 3.6cm. But wow the dof is extreme!

Thanks for the bump! 90% of my macro's in the last 4 months have been with reversed lenses...

Care to share your setup?
06-04-2010, 01:16 AM   #66
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Well i dont really have a set up as of yet, today was my first time trying the reverse stack.

For the 6:1 ratio i used a sigma 300 as the primary lens and stacked a 50(reversed) onto it.
Going to have a play with my lens soon to find a combo that works for me....
06-04-2010, 11:14 AM   #67
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QuoteOriginally posted by yeatzee Quote
Ok, question. Do I gain anything by using my macro lens as the primary lens with the 50mm stacked?
Probably not. Most macro lenses have a rather deep front recess, and stacking a lens rim-to-rim causes vignetting. (I've just now tried it with my Viv 90/2.8 and MacTak 50/4, using 25-35mm secondaries.) The best primary is whatever longish MANUAL prime you're comfortable with that has no deep recess. You want the primary and secondary objectives as close as possible.

QuoteQuote:
Does the primary lens's minimum focusing distance greatly affect mag. when using the stacked lens method?
No, not at all. The magnification is solely the ratio of primary to secondary. Put a 35mm secondary on a 105mm primary and you've got 3:1 magnification.

QuoteQuote:
How much magnification do i have when my 105mm lens is set to 1:1, with the reversed M 50mm focused at infinity?
Let's try this: Put a (non-macro) primary on extension tubes. How to calculate magnification? I just now tested a 100mm primary, 28mm secondary (M= ~3.5:1) and 50mm extension, and the magnification looks to have increased by about 50% (I'm eyeballing, not measuring). That matches a formula like MAG= (Pt:S) where Pt is the total FL+EXT of the primary, and S is the FL of the secondary. So a 100mm lens with 100mm extension (for 1:1) and a stacked 28mm would have MAG= (100+100)/28 = ~7x. Whew.

Basic guidelines: You want the primary to be as fast as possible, and you want it wide open, or all you'll get is an image circle. Use the aperture of the secondary to control exposure and DOF. Focus with the primary. Hold still.
06-04-2010, 11:33 AM   #68
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QuoteOriginally posted by RioRico Quote
Probably not. Most macro lenses have a rather deep front recess, and stacking a lens rim-to-rim causes vignetting. (I've just now tried it with my Viv 90/2.8 and MacTak 50/4, using 25-35mm secondaries.) The best primary is whatever longish MANUAL prime you're comfortable with that has no deep recess. You want the primary and secondary objectives as close as possible.



No, not at all. The magnification is solely the ratio of primary to secondary. Put a 35mm secondary on a 105mm primary and you've got 3:1 magnification.



Let's try this: Put a (non-macro) primary on extension tubes. How to calculate magnification? I just now tested a 100mm primary, 28mm secondary (M= ~3.5:1) and 50mm extension, and the magnification looks to have increased by about 50% (I'm eyeballing, not measuring). That matches a formula like MAG= (Pt:S) where Pt is the total FL+EXT of the primary, and S is the FL of the secondary. So a 100mm lens with 100mm extension (for 1:1) and a stacked 28mm would have MAG= (100+100)/28 = ~7x. Whew.

Basic guidelines: You want the primary to be as fast as possible, and you want it wide open, or all you'll get is an image circle. Use the aperture of the secondary to control exposure and DOF. Focus with the primary. Hold still.
Thanks for the info, but vignetting has yet to be a problem for me using a reversed 50mm. The cheap albinar 28mm however vignettes a heck of a lot unless I get the alignment perfect (reverse adapter has arrived yet so i've been taping them together.) where it has except able levels of it Its funny I've asked this question on several forums and have gotten a plethora of different answers....

Guess I shouldn't have sold my M 200mm after all :ugh:

06-04-2010, 03:33 PM   #69
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Last night i tried used my 50mm 1.7 as prime and reversed a 28mm onto it =1.8:1
gave an increase of working distance plus made the whole setup bit shorter and lighter too.
06-07-2010, 11:34 PM   #70
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My M 28mm F/3.5 arrived so I decided to do some quick magnification tests....

As my sigma 105mms filter ring is dented and scraped I currently cannot use my reversing adapter (hopefully I can figure out a solution) so i used my DA 55-300mm. The subject is the infinity sign on my M 50mm.... if you have one check it out to see its actual size.

Sigma 105mm at 1:1 -


My regular setup (Sigma 105mm @ 1:1 + Pentax M 50mm F/1.7 reversed) -


Pentax DA 55-300mm @ 55mm + 28mm reversed -


Pentax DA 55-300mm @ 100mm + 28mm reversed -


Pentax DA 55-300mm @ 200mm + 28mm reversed -


Pentax DA 55-300mm @ 300mm + 28mm reversed -


note: These were taking super quick before I had to leave my house. I just held the AF 360 flash off camera with my left hand and didn't really adjust the exposure at all. Just a quick simple test...

Last edited by yeatzee; 06-08-2010 at 12:20 AM.
06-07-2010, 11:57 PM   #71
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Have you tried using the 50prime and mount the 28prime reverse onto it? Its a nice small setup for 1.8:1
06-08-2010, 12:10 AM   #72
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QuoteOriginally posted by TOUGEFC Quote
Have you tried using the 50prime and mount the 28prime reverse onto it? Its a nice small setup for 1.8:1
Just got the 28mm today, so no i have not I look forward to trying it out though
06-08-2010, 12:52 AM   #73
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did you find any increase of worki ng distance with trying out the different setups?
06-08-2010, 01:56 AM   #74
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I really recommend you this book. Closeups In Nature. The photographer's guide to techniques in the field (John Shaw, 1987), all the questions youve got are in there answered. A stacked lens is simply a high quality very powerfull diopter lens (like a macro filter) I have not tested it but according this book a diopter make all lenses focus (105 mm, 200mm doesnt matter the focal length of this lens) at the same distance, it differs only in magnification. A diopter of a 50 mm lens wide open and stacked reversed is 20+, diopter=1000/(stacked lens focal length), for example raynox 150 is around 5+ and raynox 250 9+. Magnification = diopter * main lens focal length/1000. For gaining greater magnifications than one you could also use extensions but the focusing distance would be really small and it makes sense only for short lenses 28mm because magnification = extension/focla length. So with a 28 mm extension on a 28 mm lens you get magnification 1x. With longer lenses you would need more extension so its impossible to gain a 2x extension with a 105 mm sigma.
So this were the basics, now you have to choose the combination to gain magnification/working distance as you desire the most.
06-08-2010, 05:05 AM   #75
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I use a expert 300/4,5 and a raynox dcr-250 and get 2,93:1-2,35:1 and focus at 11 cm from the front lens
Here a shoot at 2,7:1 on a small cherry shrimp (uncropped)

Kindly bjorsa
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