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Forum: Film SLRs and Compact Film Cameras
10-07-2013, 09:51 AM
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focus 41 - Tokina 400mm f5.6 vs Vivitar 600mm f10 setup by shining camera, on Flickr
pentax kit lens 18-55 f3.5-5.6 by shining camera, on Flickr
pentax kit lens 18-55 f3.5-5.6 by shining camera, on Flickr
Pentax Takumar F 28-80 f3.5-4.5 by shining camera, on Flickr
Tokina RMC 400mm f5.6 manual lens with Pentax Kx by shining camera, on Flickr
Vivitar 19-35 f3.5-4.5 by shining camera, on Flickr
pentax lens group shot by shining camera, on Flickr
Pentax WR lens kit by shining camera, on Flickr
Tamron SP 500mm f8 mirror 55BB by shining camera, on Flickr
DA 40mm f2.8 XS and Big Zooms by shining camera, on Flickr
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Forum: Photographic Technique
12-03-2011, 06:05 AM
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Feel bored this afternoon, and explore all the combination with possibility and Result demo in photo for the Magnification rate.
actual stuff used in this test,
1. cheapest Pentax AF lens: DAL18-55mm f3.5-5.6
2. cheapest Pentax 135mm lens: M 135mm f3.5
3. any 50mm will do, I use M 50mm f1.4
4. cheap Extension tube 10mm, 20mm, 30mm
5. cheap PK-52mm reverse mount
6. cheap 52-49mm male-to-male thread ring, (optional 49-52 step-up ring)
Test 1: "Extension Tube is your best friend for cheap macro, make every lens a macro lens"
50mm f1.4 with 60mm Extension tube on Pentax DSLR K-x; (ant is 3mm)
actual rule image for you calculation, around 1:1 range, Object Distance around 10cm, good enough distant
135mm f3.5 with 60mm Extension tube on Pentax DSLR K-x; Object Distance around 80cm, quite a distance
Vivitar 19-35mm at 28mm with 35mm extension tube, object distance around 5mm, too close, almost touch the glass, beyong 28mm, touch glass already, cant focus
Vivitar 19-35mm at 35mm with 35mm extension tube, object distance around 5mm, too close,almost touch glass
Conclusion:
- extension tube reduce minimum focus distance to gain magnification, so short lens are likely easy to cut off the whole distance, make it too close to object. |
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Forum: Photographic Technique
12-05-2011, 09:16 AM
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Test 4: Double reversed lens combo + extension tube (all the methods I know used)
Setup: DAL18-55 revesed mounted on M 135 mm f3.5 and then onto 60mm extension tube,
to help the extreme dark viewfinder to focus, I use a light to shine through it, cast a light spot shape to move in and back to determine in-focus distance.
DAL 18-55 tune at 55mm end
DAL 18-55 tune at 18mm end
2mm shown up on 24mm width DSLR sensor, so 24:2 = 12:1 super macro now, (sorry for the long thread to get this part)
Conclusion:
Revsered mounted wide angle lens works like a macro adapter lens (like Ranyox 250), give good working distance and still produce big macro result.
Cheers. thanks for viewing. |
