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เลนส์มาโคร อีกตัวที่คะแนนการทดสอบสูงลิบลิ่ว คือ PENTAX 67 100mmf4 macro มาดูรายละเอียดกันครับ คุณภาพสูสีกับเจ้า Pentax A* ดาวเขียว 200 mm f4 macro
SMC Pentax 67 100mm F4 Macro
Sharpness
10.0
Aberrations
10.0
Bokeh
10.0
Handling
10.0
Value
10.0
Description:
Macro lens in standard focal length for the Pentax 6x7 system. The lens itself provides half life size magnification (1:2), and life size magnification (1:1) with the smc LIFE-SIZE CONVERTER which screws into the front of the lens. The trumpet-shaped lens hood attaches to the front of the converter as well as to the front of the lens in lieu of the converter.
SMC Pentax 67 100mm F4 MACRO
© www.pentaxforums.com, sharable with attribution
Image Format
6x7 Lens Mount
Pentax 6x7 Aperture Ring
Yes (no A setting) Diaphragm
Automatic, 8 blades
Optics
6 elements, 4 groups Mount Variant
Inner Bayonet Max. Aperture
F4 Min. Aperture
F32
Focusing
Manual Min. Focus
44 cm Max. Magnification
0.5x
Filter Size
77 mm Internal Focus
No Field of View (Diag. / Horiz.)
48 ° / 38.6 °
Hood
Dedicated trumpet shaped screw-in Case
Lens Cap
Coating
SMC Weather Sealing
No Other Features
Diam x Length
92.5 x 77.5 mm Weight
600 g Production Years
1998 (start of production)
Notes
Engraved name: smc PENTAX 67 MACRO 1:4 100mm
User reviews
Magnification is increased to 1x with the dedicated LIFE-SIZE CONVERTER 67, which screws into the front of the lens. The trumpet shaped lens hood also fits the converter.
Usage:
The 100/4 Macro is a bit of an odd lens. Its front element is recessed in a funnel and has a 49mm filter thread at the bottom. This is where the lens hood or 49mm filters screw into. If you are using the LSC you remove the hood and screw the LSC into the 49mm filter thread, then you screw the hood into the top of the LSC. You can also mount 77mm filters onto the top of the lens hood. The lens has two distance scales, one when using the LSC and one when you are not. Confused, refer to one of the later Pentax 67 “Interchangeable Lenses Operating Manuals” for more information.
OUTDOORS: The 100/4 macro is not the easiest lens to use outdoors, especially with the LSC attached. The subject to film distance is so small (inches/centimeters) that you will block a lot of light falling on your subject. Also to get the proper DOF you will be using slow shutter speeds, so hand held shooting is out and MLU is required. This also makes it very difficult shooting moving subjects, such as insects and wind blown flowers. Using a tripod will fix some issues, but maneuvering one into position that is strong enough to support a 6x7 body & 100/4 is also going to be very hard.
INDOORS: For me this is where the 100/4 macro shines. In a controlled environment using daylight colour temperature lighting, I can get close enough to the subject using a tripod, MLU, slower film (100ISO) and very slow shutter speeds. If you own a Pentax 67II, one of the “bright” telephoto/macro screens will help in focusing.
FILTER: As previously mentioned you can use either 49mm or 77mm screw in filters. You can’t use Pentax 6x7 77mm bayonet filters on this lens.
Summary:
I can produce brilliant shoots indoors with this lens and it’s extremely sharp. Getting 1x magnification without extensions tubes is also great, as the TTL/AE metering will work while the lens DOF lever is in left the “AUTO” position. The only real issue with the 100/4 macro is the short film to subject distance, this is mostly due to the shorter focal length of the lens and the higher magnification achieved. Ideally the FL would have been 200mm, but never the less this is a truly excellent lens.
The images this lens produces are EXACTLY why I bought into medium format in the first place. Can't imagine a sharper, contrastier lens. It's so stunning to view the chromes on the light table! Ordinary macro work won't stand up to 30x40 enlargements. No one can believe the 30x40's are from a 6x7 Macro lens and not a large format system. Even corner sharpness holds up quite well.
My initial fears about the standard multi-element life-size converter were unfounded. The lens reaches half life-size without the converter and comparing those shots with full life-size shots indicates almost no difference. I still can't believe how well the converter works. Add a 77mm Canon 500D multi-element close-up lens to the front of the "trumpet" and you get appx. 1.5x life-size with marketable sharpness and color rendition. This set-up has rendered my extension tube set moot. 1.5x in medium format is almost unheard of...
This lens also serves as a ridiculously sharp normal lens. It's bigger and heavier than the 105 (which is also sharp), but this "new generation" Macro model gets my vote based on imaging beyond belief. By "new generation" I'm referring to the fact that this lens was developed and released around the same time as the 67II--both very recently in Pentax 67 terms.
I pretty much put my 35mm system on the shelf for 3 years after shooting through this lens
The Pentax 67 system is almost four decades old and has been my camera of choice since its introduction. Many of the 67 lens designs are also that old. Then, they were state-of-the-art; today, not so much.
The 135mm ƒ/4 macro lens focused down to 1/3X magnification with no extension tubes while providing images of good quality at normal distances. But, it's a bit low in contrast, lacking the snap typical of other Pentax 67 lenses, and 1/3X is hardly close focusing by today's standards.
Enter the next generation: the 100mm ƒ/4 macro lens. It focuses to better than 1/2X with no extension tubes and greater than life-size with a front-of-the-lens converter. The compact lens hood screws into the front element of the lens or converter, and the lens cap snaps on the front of the hood, so the whole assembly makes a nice package when not in use.
The front converter means I don't need to dismount the lens to get greater than 1/2X magnification. The converter goes on and off much faster than extension tubes, takes only one hand, and I'm less likely to disturb my macro set-up. Of course, I can still add an extension tube or tubes to get more than 2X magnification.
The 100mm macro lens is a fine performer at all distances. That its close-up performance is beyond reproach will not surprise anyone, but it's a really great lens all the way out to infinity.
The Pentax 100mm f/4 Macro lens features direct focusing from infinity to 1:2 magnification (17.4").
Pentax lenses have been developed using the latest in computer-assisted optical design technology. Lens surfaces are treated with Pentax's exclusive Super-Multi-Coating for sharp, high-contrast images
1:2 magnification possible without additional accessories 1:1 magnification possible using included Life Size Adapter The included Life Size Adapter is a matched close-up lens, which attaches to the front of the lens and will allow 1:1 magnification (12.6") This is a high quality and versatile lens which can be used as a standard lens
Equivalent 35mm Focal Length 50mm
Angle of View @ Infinity 48°
Filter Size 49mm, with lens hood/filter ring that accepts 77mm filters. 77mm should be considered the standard size.
Elements/Groups 6/4 (Life-Size Converter = 3/3)
Shutter Focal plane shutter built-in to all Pentax model 67 camera bodies. Speeds from 1/1000 to 1 second (4 seconds on 67II) B and T.
f/Stop Range f/4 - 32 with 1/2 stop calibrations and stop-down preview feature
Flash Synchronization TTL-OTF dedicated flash possible with 67II model in conjunction with optional 67II Hot-shoe Grip and a compatible TTL flash unit. Standard PC socket on body of all 67 camera models for electronic flash connection. Flash sync on all models possible at speeds of 1/30sec and lower. With the Leaf Shutter 165mm f/4 lens, electronic flash sync is possible up to 1/500sec. TTL/OTF flash control IS NOT possible with the leaf shutter, and sync connection is through the PC connection on the lens barrel ONLY.
Minimum Focus Distance 0.44m (17.4"), with Life Size Converter - 0.314m (12.6") - magnification = 1:1. NOTE: Attaching the Life Size Converter requires unscrewing the front lens hood/filter ring. Once you have done this, attach the Converter and re-attach the lens hood/filter ring.
Dimensions 77 x 92.5mm (3 x 3.7") L x W
Weight 600g (21.2 oz)
Pentax 67, 100mm F4 Macro lens is part of my system for last five years. It performs great on it's own and with life size converter it is perfect. Contrast, sharpnes and colour are outstanding. I use it with 2X converter and/or with extension tubes hend held. Magnification goes to 2.7X with Life Size Converter and Extension tubes. With bellows and copy stand that lens can do magnification of 5X and more. With bellows exposure factors are about 40-50. So, one needs good studio lights with such set up
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