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Forum: Pentax News and Rumors
11-17-2018, 08:40 AM
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If something is free, you are the product. |
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Forum: Pentax News and Rumors
11-17-2018, 05:25 AM
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Forum: Pentax News and Rumors
11-08-2018, 09:28 AM
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Forum: Pentax News and Rumors
10-13-2018, 06:18 AM
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Forum: Pentax News and Rumors
10-02-2018, 09:47 AM
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At 1:1 the distance between the subject and the sensor (a.k.a. the focusing distance) is equal to four times the focal length. Hence the focal length of the Irix Dragonfly at 1:1 is equal to 350 ÷ 4 = 87.5mm.
The focal length of the smc Pentax-D FA 100mm f/2.8 Macro WR at 1:1 is equal to 303 ÷ 4 = 75.8mm.
That of the smc Pentax-FA★ 200mm f/4 Macro ED [IF] was equal to 510 ÷ 4 = 127.5mm.
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Forum: Pentax News and Rumors
09-27-2018, 05:11 AM
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There is no such thing as (normalised) WR rating. WR, AW, dustproof, drip-proof are marketing words. Only the IP Code, International Protection Marking, IEC standard 60529, published by the International Electrotechnical Commission (IEC) and its European equivalent the EN 60529 standard are normalised standards.
https://en.wikipedia.org/wiki/IP_Code
As for TH Swiss, thy say that 'Each Irix lens is equipped with a weather sealed construction which protects the interior against dust and moisture. Thanks to inner seals, our lenses are also protected from accidental water splashes. No matter the journey, you can be confident that our weather sealed lenses will offer you maximum resistance to the extremes.'
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Forum: Pentax News and Rumors
09-26-2018, 01:00 AM
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Short video (25") presenting the main selling points of the Irix Dragonfly 150mm f/2.8 1:1 Macro.
- Built-in CPU for aperture control
- 11 rounded aperture blades
- 5 O-rings (=gaskets) in key places
- Lightweight design
- Compact size
Youtu.be
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src="https://www.youtube.com/embed/K8L6AdTJJKk?controls=1" allowfullscreen>
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Forum: Pentax News and Rumors
09-24-2018, 01:46 PM
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Forum: Pentax News and Rumors
09-24-2018, 07:38 AM
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Not for those who are into subjects (e.g. timid bugs) that require this extra bit of working distance. Obviously you are not: you are looking for a versatile lens (normal portrait work + macro work) easy to carry around. The Dragonfly doesn't meet your specifications, however it can meet those of other people.
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Forum: Pentax News and Rumors
09-24-2018, 07:31 AM
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A working distance of 165mm for the Irix Dragonfly 150mm f/2.8 Macro 1:1 versus 129mm for the smc Pentax-D FA 100mm f/2.8 Macro WR is not 'the theory', it's according to specifications and/or measurements.
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Forum: Pentax News and Rumors
09-24-2018, 07:27 AM
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There are many such lenses around.
Canon
- EF 100mm f/2.8 Macro USM
- EF 180mm f/3.5L Macro USM
- EF-S 60mm f/2.8 Macro USM (2005)
- EF 100mm f/2.8L Macro IS USM (2009)
- EF-S 35mm f/2.8 Macro IS STM (2017)
- TS-E 50mm f/2.8L Macro (2017)
- TS-E 90mm f/2.8L Macro (2017)
- TS-E 135mm f/4L Macro (2017)
- RF 35mm f/1.8 IS STM Macro (2018)
Fujifilm- Fujinon GF 120mm f/4 R LM OIS WR Macro (2017)
- Fujinon XF 80mm f/2.8 R LM OIS WR Macro (2017)
Hasselblad
- XCD 120mm f/3.5 Macro (2017)
Leica
- APO-Macro-Elmarit-TL 60mm f/2.8 ASPH (2016)
Nikon
- AF-S Micro-Nikkor 105mm f/2.8G IF-ED VR (2006)
- PC-E Nikkor 24mm f/3.5D ED (2008)
- AF-S Micro-Nikkor 60mm f/2.8G ED (2008)
- PC-E Micro-Nikkor 85mm f/2.8D (2008)
- AF-S DX Micro-Nikkor 85mm f/3.5G ED VR (2009)
Olympus
- M.Zuiko Digital ED 60mm f/2.8 Macro (2012)
- M.Zuiko Digital ED 30mm f/3.5 Macro (2016)
Panasonic
- Leica DG Macro-Elmarit 45mm f/2.8 ASPH OIS (2009)
- Lumix G Macro 30mm f/2.8 ASPH Mega OIS (2015)
Samsung
- NX 60mm f/2.8 Macro ED OIS SSA (2011)
Samyang
Sigma
- 150mm f/2.8 EX DG OS Macro HSM (2010)
- 180mm f/2.8 APO Macro EX DG OS HSM (2012)
Sony
- E 30mm f/3.5 Macro (2011)
- FE 90mm f/2.8 Macro G OSS (2015)
Tamron
- SP AF 60mm f/2 Di II LD IF Macro (2009)
- SP 90mm f/2.8 Di VC USD 1:1 Macro (F004, 2012)
- SP 90mm f/2.8 Di VC USD 1:1 Macro (F017, 2016)
Venus Optics
- Laowa 15mm f/4 1:1 Macro (2015)
- Laowa 60mm F2.8 2x Ultra Macro (2015)
- Laowa 100mm f/2.8 2x Ultra Macro APO (2018)
- Laowa 24mm f/14 2x Macro Probe (2018)
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Forum: Pentax News and Rumors
09-24-2018, 06:29 AM
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A 27% longer working distance @1:1 (16.5cm vs. 13cm)?
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Forum: Pentax News and Rumors
09-24-2018, 02:29 AM
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'Information on availability and prices will be provided at a later date.' (op. cit.)
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Forum: Pentax News and Rumors
09-24-2018, 01:43 AM
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Forum: Pentax News and Rumors
09-23-2018, 01:57 PM
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Yes but no more than with a 65mm of 100mm lens at 2:1. As already explained before in this very thread: at macro distance, depth of field only depends on the magnification ratio, not on the lens's focal length.
Depth of field - Wikipedia |
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Forum: Pentax News and Rumors
09-21-2018, 06:22 AM
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New teaser: this is indeed a 1:1 macro lens with a 34.5cm minimum focusing distance and a tripod collar.
Youtu.be
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src="https://www.youtube.com/embed/mE0Gvnsuif8?controls=1" allowfullscreen>
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Forum: Pentax News and Rumors
09-20-2018, 07:53 AM
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Forum: Pentax News and Rumors
09-20-2018, 06:24 AM
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At macro distance, depth of field only depends on the magnification ratio, not on the lens's focal length.
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Forum: Pentax News and Rumors
09-19-2018, 09:27 AM
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It's still a rumour though... ;) :p
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Forum: Pentax News and Rumors
09-19-2018, 09:11 AM
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Right. Irix lenses are KA lenses, not KAF. So far (but I don't think their first autofocus lens would be a macro lens).
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Forum: Pentax News and Rumors
09-19-2018, 08:48 AM
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Since yesterday Irix have posted three video teasers on their YouTube channel:
Youtu.be
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src="https://www.youtube.com/embed/a3eCuaW7DGw?controls=1" allowfullscreen>
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Youtu.be
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src="https://www.youtube.com/embed/qpQ80-QBBZU?controls=1" allowfullscreen>
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Youtu.be
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src="https://www.youtube.com/embed/GH4bgQR7HZs?controls=1" allowfullscreen>
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The third one reveals the Dragonfly is a lens. Photo Rumors goes one step further and 'guesses' that this lens is a 150mm macro lens. Pretty educated guess I would say, considering that the image below (found on their website: Third Irix Dragonfly lens teaser - Photo Rumors) does not come from the video... :hmm: :lol:
Considering that the two lenses already launched by TH Swiss AG under the Irix trademark are available in Pentax KA mount, I chose to post the above in this section. |
