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Forum: Post Your Photos!
08-07-2017, 02:34 AM
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Yeah , whats happened is you have adjusted your focus range to MACRO !
Adjust the focus on your lenses to infinity , you will not get infinity , what you well get is some Macro distance ..
With both lenses adjusted to infinity see where you have focus .. I can't tell you , but it just might be something like 5 to 10 centimeters ( ? ) in front of the lens .. ( or maybe closer ? , I don't know )
If you set the 100mm lens to close focus , the focus might be behind the front element of the reversed lens .
Been a while since I did it , and I plan on doing it again especially as I want to move to 2:1 macro this spring / summer .
Sorry I don't remember more , but its been a long time since I did 3:1 macro .
And keeping things steady is very important ...
Remember , when you magnify , you magnify all the problems as well . ( a few mm the wrong way and you are out of focus as your DOF is now very small )
I would suggest setting up a tripod and table and a subject to photograph , just to work out you focus distances ..
Thats 8mm from the left side of the image to the right side ... @ 3:1
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Forum: Post Your Photos!
08-02-2017, 07:59 PM
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I just got me one of these click here for Feebay item
Be called a " Macro Coupler Coupling Lens Reverse Ring Close Up Adapter " Thats a mouth full .. But its the sort of thing you want when reversing a lens in front of another ...
Now you may need a " step up " coupling ring or a " step down " coupling ring , or possibly a matching coupling ring ..
Many Pentax Lenses being 49mm on the filter ..
I just ordered some bits for a new project / experiment for this coming spring / summer and essentially I will be reversing a lens in front of various other lenses to see how effectively you can macro on what I would call a budget .
Remember , reversing a 50mm lens in front of another 50mm lens effectively gives you 1:1 macro .
Why do that ?
I would do it to maintain aperture control .. The lens mounted in the body will have functioning aperture , and the lens reversed in front of it will simply remain wide open .
Easy peasy lemon squeezy .
I will be testing various lenses from 50mm on up to possibly 150mm + .
One lens I really want to try is a 135mm Prime with a 50mm reversed in front of it , that would be about 2.5:1 Macro .. ( I really want to try that )
And how about a 50mm Macro lens ? ( 1:2 ) with a 50mm reversed in front of it , should be 1.5:1 ( Lots of things to try )
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Forum: Post Your Photos!
08-02-2017, 12:46 AM
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Ok ..
1.4x TC .. 100mm lens , 15mm or 8mm Lens ...
So here is what I would do : ( Have done )
1.4x TC to body , 100mm lens to TC and then reverse the 15mm lens to the 100mm lens ...
What I have done ...
1.5 TC , 100mm lens with a 50mm lens reversed .. That gave me 3 to 1 Macro ( 150mm to 50mm Reversed = 3 to 1 )
Why do it this way ?
1) Maintain aperture control
2) 3 to 1 Macro
If you 1.4 - 100 - 18 reversed ( 140mm / 18mm = 7.7 to 1 Macro )
That is seriously extreme macro , and you must be photographing really small stuff because your field of view ( side to side ) will be very small .
Your DOF will be small ...
You will need a lot of light to maintain a decent shutter speed to counter movement ...
Remember , the more you magnify - you magnify everything and cut the amount of light ...
You need light ! , you need shutter speed ,
Your description of what you are doing is a little :confused: confusing ...
But if you are lens stacking ? I would suggest starting off a little less extreme ...
Try 2:1 Macro , then maybe 3:1 and 4:1 and see how that difficulty factor is working out . ( Because it gets harder )
I did manage 3:1 , but @ 4:1 it got very Miss rather than Hit ( I shoot free hand )
So possibly a picture of your set up , and camera settings ( ISO - SHUTTER - Fstop )
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