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Forum: Pentax Q
4 Days Ago
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Tamron TV 16mm f/1.4
PhotoBucked became PhotoRacket so my photos are gone. Here is an update:
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Forum: Pentax K-3 III
5 Days Ago
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Agree. At the bottom of your photo, you should find two SDM pins like on this picture:
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Forum: Pentax News and Rumors
6 Days Ago
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I apologize: I thought that depth of field was affected by the circle of confusion and that the Q's circle of confusion was smaller than an APS-C's one, leading to a bigger DOF at same magnification and same aperture...
I still think that a fact and an opinion must not be confounded. I will try to spend some time to take the same picture with the Q at F/1.8 and with the K-1 at various apertures from F/1.8 to 4 in order to cure my small-DOF pathology ;)
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Forum: Pentax News and Rumors
04-17-2024, 11:39 AM
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I own a GR, a GRIII and a Q, I hardly use the latter because the image quality is generally outdated (way too much DOF).
I rarely use my smartphone to take pictures, yet it is very convenient to phone.
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Forum: Pentax SLR Lens Discussion
04-15-2024, 12:30 PM
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That is right, the flash can be used in order to freeze your subject. Using a WR 100mm with the on-board flash and a diffuser should be fine.
The HD DFA 100mm WR should be better than the former DFA 100mm WR regarding purple fringing.
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Forum: Pentax SLR Lens Discussion
04-15-2024, 12:16 PM
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When you practice macro, you will never use an on-board flash, at a minimum you will use a tilt-head flash, so shadows will never be a problem, even with a very long lens (e.g. a 180mm).
Of course, you could also use a specialized flash with flexible heads (e.g. kuangRen KX-800, adaptalux, etc.).
Regarding Pentax macro lenses, I am sorry: my macro K-mount lenses are not Pentax ones, I preferred Tamron, Irix, Sigma, Oshiro-Bresser, Laowa-Venus, Mitakon and even Panagor, to Pentax.
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Forum: Pentax K-3 III
04-13-2024, 12:00 PM
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Could you post a photo showing the TC contacts?
It would be useful.
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Forum: Pentax SLR Lens Discussion
03-23-2024, 02:12 AM
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My DA* 300mm F/4 SDM motor is broken, as I bought a Pentax F 1.7x adapter I started to use the 300mm with the AF adapter in order to keep a precise focusing. So I now have a resulting 510mm F/6.8.Sharpness of this combo is excellent so I never repaired the 300mm (I may convert its SDM AF to screw AF, in the future) and always use it with the adapter.
I sometimes stare at Tamron 400mm F/4 but never succumbed.
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Forum: Lens Clubs
03-16-2024, 02:35 PM
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Vivitar 90-180mm flat field
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Forum: Photographic Technique
02-20-2024, 01:00 PM
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I owned some zooms in the past and still owns two: a Sigma 70-200/2.8 and a Vivitar Series 1 90-180/4.5 "flat field".
Although the first one is brighter, I never used it for floral pictures while the Vivitar really shines (and reaches 1:2 at 180mm).
Generally speaking, I prefer a lens whose blades are curved (e. g. the Irix 150mm macro) but I took lots of floral photos using the Vivitar. Some are here: Vivitar Series 1 90-180mm F/4.5 flat field | Flickr |
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Forum: Pentax SLR Lens Discussion
02-20-2024, 12:36 PM
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Replacing the focusing screen is generally very helpful (I did it for my K100D and my K-7 but still hesitate for my K-3).
Another solution is a magnifier eyecup. I own a Refconverter A, it is a very good investment. |
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Forum: Troubleshooting and Beginner Help
01-23-2024, 02:09 PM
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My own Laowa 100mm macro looks exactly like yours, it fits on my different cameras (K-1, K-3, K-7) but I do not own a KP so I never tried this combination.
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Forum: Pentax SLR Lens Discussion
01-03-2024, 01:17 PM
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If you are on a budget, a 50mm F/1.8 and a strobist combo (manual adjustable flash + umbrella) could fit the bill.
I used to buy old flashes (Vivitar 283 or Vivitar 285) and to modify them in order to add a potentiometer and an external 6V battery (photos here: strobist stuff | Flickr). Now you can find affordable chinese adjustable flashes without being obliged to modify old stuff.
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Forum: Pentax SLR Lens Discussion
12-29-2023, 10:31 AM
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Forum: Pentax K-70 & KF
12-23-2023, 04:22 AM
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Manual focusing needs to be practiced but is always useful.
However, a wide angle lens like the Rokinon 16mm, even at F/2, gives a lot of DOF so, most of time, you will successfully use hyperfocal rules.
At very small distances, focusing will remain difficult but you can use some tricks like live-view or viewfinder attachments. I own a Pentax Refconverter A, it is an angle viewfinder which can be switched between 1x and 2x magnification, it is sometimes very useful for close-up photos.
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Forum: Pentax K-3 III
12-20-2023, 12:51 PM
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I see this thread as a deliberate controversy (the question is aimed to people who have seen the upside of downsize) but I will take a moment to give my point of view.
If you want to own a single DSLR, you can of course choose a K-3/K-3II/K-3III, it is an excellent choice.
I own both a K-1 and a K-3 and never question my double choice, because I choose the DSLR I will use according to what I will photograph.
The maximum print size is not a concern, most of the time, but if you want to print a A1 poster a K-1 will do a better job than a K-3/K-3II/K-3III. The K-1 shows less noise at 3200 ISO than the K-3/K-3II/K-3III at 1600 ISO, it is another topic to keep in mind when there is few light. I also choose the K-1 for super-wide angle shots, because I own a FF 12mm and no APS-C super-wide angle lens.
In other situations, I will prefer the K-3/K-3II/K-3III, mostly because it is lighter, smaller, and because 24MP files are enough for most of my pictures.
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Forum: Pentax SLR Lens Discussion
12-13-2023, 01:05 PM
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Working distance varies according to the global focal length. A close-up (e.g. a DCR-150 or a DCR-250) reduces the focal length, hence it reduces the working distance. Extension tubes, for a same magnification, lead to a higher working distance than a close-up.
Both close-up lenses and extension tubes are very useful when you do not have an adequate macro lens, but this is not the main subject of this thread.
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Forum: Pentax SLR Lens Discussion
12-12-2023, 12:28 PM
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I own both of these lenses. The Tamron is the best for sharpness, the Irix for bokeh and working distance.
Overall, I prefer the Irix.
Since I bought a Laowa 100mm 2:1 lens, I never used the Tamron and may sell it but will never sell the Irix.
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Forum: Troubleshooting and Beginner Help
12-03-2023, 12:30 AM
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I have been using the Pentax cleaning kit since 2006 or 2007, I cannot imagine another way to clean my cameras sensors.
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Forum: Post Your Photos!
11-30-2023, 02:01 PM
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Very nice portrait, the only potential problem I see is the background at the top right.
There are some lovely models in Lyon, according to your portfolio.
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Forum: Troubleshooting and Beginner Help
11-23-2023, 10:45 AM
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Batteries are inexpensive, I own both no-name and Pentax ones, all are excellent.
I own a K-3 and a K-1, the K-3 still being my favourite camera because it is smaller and lighter, and I do not aim to replace it untill it becomes non-repairable.
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Forum: Pentax SLR Lens Discussion
11-20-2023, 12:52 PM
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Il est difficile de comparer des pommes et des oranges...
You are comparing a 35mm and a 50mm, the first being a M42 mount fully manual lens, the second being an autofocus Pentax-mount lens.
I would choose the Pentax lens for several reasons : the DA 50mm is automatic, autofocus, and in Pentax mount (and I already own a FA 35mm F/2 which is an excellent lens). Overall, the DA 50mm is a very good lens. The MIR's sharpness is probably better but sharpness is not the only parameter to consider.
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Forum: Troubleshooting and Beginner Help
11-05-2023, 04:45 AM
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Same for me. I sold all of my adaptall lenses but I keep one PKA adapter "in case of", I would not sell it because this one works fine (which is not the cas for all of them).
I owned two Tamron adaptall 90mmmacro lenses (52B and 72B), they were great, I sold them when I bought newer macro lenses.
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Forum: Pentax Full Frame
10-28-2023, 06:09 AM
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Laowa 12mm F/2.8 Zero-D when I need extra-wide-angle photos
Pentax smc A 20mm f2.8 for wide-angle photos
Sigma 24mm F/1.8 EX DG ASPHERIC MACRO for not-so-wide-angle photos (I enjoy its rendition)
For special purpose, I use other lenses (e.g. for shallow or huge depth of field, I can use a tilted Mir-26B 45mm F/3.5 or a tilted Rodagon 80mm F/4), any lens may be used in certain cases.
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