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Forum: Pentax Q 05-30-2020, 11:58 AM  
Small Flashes for the Q/Q10/Q7
Posted By Abbazz
Replies: 49
Views: 8,509
These small Micro 4/3 flashes have no battery (that's why they are so compact) and are powered by the camera through extra contacts on the hotshoe. They won't work on a Pentax Q.

Cheers!

Abbazz
Forum: Pentax Q 12-07-2019, 03:43 PM  
What big system do you carry and does the Q ride along?
Posted By Abbazz
Replies: 26
Views: 1,717
I use the Q either by itself when traveling light, or as a second camera. When the Q is used with another camera, my main camera is either a medium format (Fuji G690, Pentax 6x7) or a Sony A7.

When even the Q is too bulky, I use a DxO One in standalone mode. Its lens is fixed (f/1.8 32mm eq. prime) but the sensor is bigger than the Q's (1").

Cheers!

Abbazz
Forum: Pentax Q 11-15-2019, 01:16 AM  
Wish the Q could use built in flash for wireless P-TTL master.
Posted By Abbazz
Replies: 14
Views: 1,048
Even if the built-in flash doesn't work for wireless P-TTL, you can always use a wire with your Pentax flash:


Vello P-TTL Cord for Pentax (image credit: B&H)

I use one for macro, it's cheap and it works very well (available from B&H, Amazon, etc.).

Cheers!

Abbazz
Forum: Pentax Q 10-26-2019, 09:03 PM  
Considering Used Q--which one?
Posted By Abbazz
Replies: 15
Views: 1,586
Thanks for catching the mistake and sorry for that. I forgot to switch it off the last time I used the camera. I will edit my original post accordingly.

Cheers!

Abbazz
Forum: Pentax Q 10-26-2019, 07:17 PM  
Considering Used Q--which one?
Posted By Abbazz
Replies: 15
Views: 1,586
I just took a couple of pictures to illustrate the differences between both cameras. Nothing fancy, just a view at infinity shot in bad weather with the 01 Prime lens on the Q7 and Q-S1 cameras.To minimize the risk of discrepancies, I used the same 01 lens on both cameras. Both were set to manual exposure mode, f/4.5 aperture, 100 ISO, daylight white balance and RAW + large JPEG mode.

I carefully measured the exposure with my Gossen Luna-Pro: 1/125s for F/4.5 and 100 ISO. The first surprise was that the Q-S1 gave me a correctly exposed picture at f/4.5 and 1/125s but the corresponding Q7 picture was way too dark:


Q-S1 (straight out of camera JPEG at 1/125s, F/4.5 and 100 ISO)


Q7 (straight out of camera JPEG at 1/125s, F/4.5 and 100 ISO)

[EDIT: as per KWB' s post, it appears that I had the ND filter activated in my Q7, therefore it is perfectly normal for the image from this camera to exhibit a 2 stop difference with the one from the Q-S1.] In order to get a correctly exposed picture with the Q7, I had to use 1/40s at F/4.5 and 100 ISO, that's a difference of almost 2 stops compared to the Q-S1! It means that when you shoot in low light at 800 ISO on the Q-S1, you have to crank up the sensitivity to 2500 ISO on the Q7 to get an equivalent shutter/diaphragm couple. [EDIT: there is no difference in exposure between the Q7 and the Q-S1.]

Here are the pictures, with the exposure on the Q7 adapted in order to get the same density on the JPEG (you can click on the pictures to inspect them full size):


Q-S1 (straight out of camera JPEG at 1/125s, F/4.5 and 100 ISO)


Q7 (straight out of camera JPEG at 1/40s, F/4.5 and 100 ISO)

100% details of both JPEG OOC pictures (Q-S1 on the left, Q7 on the right):



Here are the same pictures but processed with Adobe Camera Raw from the raw files (minimal processing, low sharpening):


Q-S1 (raw file processed with Adobe Camera Raw)


Q7 (raw file processed with Adobe Camera Raw)

100% details of both JPEG from raw pictures (Q-S1 on the left, Q7 on the right):



I find the Q-S1 images distinctively sharper at base ISO both for processed RAW and out-of-camera JPEG, especially when looking at low contrast fine details, like tree foliage at infinity. If you download the original JPEGs processed with ACR and give them a bit of sharpening, the difference becomes even more apparent.

Cheers!

Abbazz
Forum: Pentax Q 10-23-2019, 01:33 AM  
Considering Used Q--which one?
Posted By Abbazz
Replies: 15
Views: 1,586
The Q-S1 is a noticeably improved version of the Q7:
  • It does indeed offer continuous autofocus for video recording with certain lenses, while the Q7 doesn't.

  • The image processor has also been updated: the Q-S1 delivers improved JPEGs, with less noise and more detail, especially when you increase the ISO.

  • Response time is better: less wait at switch-on, faster AF and speedier write times.

  • White balance is better, maybe because the Q-S1 has a stronger IR rejection filter (which makes the Q7 a better candidate if you want to try IR photography, although it would be even better to remove the IR filter altogether).


Q-S1 online reviews usually just state that the sensor and the display are the same as on the Q7 but most fail to acknowledge the various improvements between the two models. Here's a link to reviews (in French) demonstrating the differences:

Q7 Review


Pentax Q7 - Credit: lesnumeriques.com

Q-S1 Review


Pentax Q-S1 - Credit: lesnumeriques.com

Cheers!

Abbazz
Forum: Pentax Q 02-24-2019, 06:19 PM  
12V charging options?
Posted By Abbazz
Replies: 13
Views: 1,378
Yes, I usually travel with my Fuji W3 (3D camera), Instax SQ10 (instant camera and printer) as well as a couple of Pentax Q bodies and assorted lenses. I find this kit very convenient because all three cameras use the same lithium-ion batteries and I only need to bring one charger (mine connnects to a standard USB plug and has a double charging slot).

Cheers!

Abbazz
Forum: Pentax Q 02-21-2019, 11:21 PM  
Fish-Eye Options for the Q
Posted By Abbazz
Replies: 31
Views: 4,786
For the Q, the Entaniya M12 280 would be more useful with an image circle of 4.2mm, as well as less ponderous (175 g) and much easier to obtain. And its field of view is even better than the Lens Rentals contraption: 280 degrees!

Cheers

Abbazz
Forum: Pentax Q 02-12-2019, 04:38 PM  
Pentax Auto 110 lenses for the Q
Posted By Abbazz
Replies: 107
Views: 25,333
There is indeed a built-in aperture stop. The resulting f-stop is f/8.0, which is a bit too much for the Q' s tiny sensor. As a consequence (and also because of the rather crude 2 element optical construction), the resulting images are quite soft. Here' s a copy of the user's notice (click for full size):



Cheers!

Abbazz
Forum: Pentax Q 02-05-2019, 02:30 AM  
Small Flashes for the Q/Q10/Q7
Posted By Abbazz
Replies: 49
Views: 8,509
The flash will only work in manual mode when used as an optical slave (triggered by the light coming from the camera's built-in flash unit).

In P-TTL mode, you have to either physically connect the flash to the hot-shoe of the camera (an extension cord can be used, as long as it has the additional contacts for
Pentax), or you can use a radio transmitter (or another Godox compatible flash) on the camera's hot-shoe.

Cheers!

Abbazz
Forum: Pentax Q 02-03-2019, 01:06 PM  
Small Flashes for the Q/Q10/Q7
Posted By Abbazz
Replies: 49
Views: 8,509
It's not really a tiny flash (although compact) , but its possibilities are amazing. The Godox TT350P is a compact flash offering state-of-the-art specifications: full compatibility with Pentax TTL, a built-in wireless transmitter (can act as master or slave unit), a tilting head, high speed capabilty, etc.


Credit :B&H Photo Video

I use this flash with my Pentax Q and it's a breeze. The price is also quite nice considering the specifications.

Cheers!

Abbazz
Forum: Pentax Q 02-02-2019, 03:24 AM  
Poll: If there is a new Q .... what would you like it to be ?
Posted By Abbazz
Replies: 42
Views: 3,087
It's for the cable of the Pentax K-AC115 AC Adapter Kit (or the cheaper Fuji equivalent).


Great idea. Like the IR filter on some Sigma DSLRs.

Cheers!

Abbazz
Forum: Pentax Q 01-31-2019, 10:48 PM  
Poll: If there is a new Q .... what would you like it to be ?
Posted By Abbazz
Replies: 42
Views: 3,087
Agreed.


It should be possible to include a built-in electronic viewfinder without increasing the size of the camera. Look at the Panasonic GM5, which is hardly bigger than the Pentax Q (and much thinner), but manages to cram in an electronic viewfinder, despite having a much bigger 4/3 sensor:




.

On the 1/1.7" sensor, the 01 lens has the same field of view of 58°, same as a 39mm lens on a 24x36 sensor, and not far from a 35mm (63°). Having a short-normal prime is the main reason I prefer shooting with the cameras equipped with the bigger sensor rather than with the original Q's smaller sensor.

If we could only have one new prime, I would rather opt for a 90mm equivalent (a close focusing one would be even better).

Cheers!

Abbazz
Forum: Pentax Q 01-31-2019, 07:03 PM  
Poll: If there is a new Q .... what would you like it to be ?
Posted By Abbazz
Replies: 42
Views: 3,087
I beg to disagree. The whole purpose of the Q series is the small sensor. There are other options for people looking for bigger sensors, although the cameras with 1" sensor and interchangeable lenses have been discontinued (Samsung NX Mini, Nikon 1). The 1/1.7"sensor is the "native" format of the Q series, as the 1/2.3" was only a temporary solution while waiting for the release of the 1/1.7" back-illuminated sensor from Sony.

I don't think Sony has upgraded the 1/1.7" 12MPix sensor, and this might be the biggest issue preventing Ricoh from releasing a new Q series camera. Personally, I don't need more pixels. In fact, I would prefer to trade pixels for dynamic range. I would love a Q-S2 with an 8MPix sensor with 14.5EV of dynamic range. And an electronic viewfinder, even an external one.

Cheers!

Abbazz
Forum: Pentax Q 01-23-2019, 11:03 AM  
Q, Q7 or Q-S1?
Posted By Abbazz
Replies: 20
Views: 2,807
Regarding the looks, I actually prefer the Q-S1, but I know it's only me... I also find the knob / IR receiver / vestigial handle quite useful to enhance the handling with larger lenses. Have you tried to put a couple of o-rings around it to have a better grip (I think this is something that has already been suggested here) ?

Cheers!

Abbazz
Forum: Pentax Q 01-23-2019, 02:50 AM  
Q, Q7 or Q-S1?
Posted By Abbazz
Replies: 20
Views: 2,807
In my opinion, the Q-S1 is the camera to get. First, because it has the newer 1/1.7" sensor, which is a bit larger than the 1/2.3" sensor in both the original Q and the Q10. Because the sensor is larger but the number of pixels remains the same, then the pixels are less densely packed (from 43.57 to 28.62 Mpx/cm²), which is a good thing. The larger sensor is also better suited to the most commonly used lenses in the system. The 02 Standard zoom, which is approximately equivalent to a 28-84mm zoom when used on the smaller sensor of the Q/Q10, becomes a 23-68mm equ. on the larger sensor of the Q7/Q-S1. The 01 Prime, which is approximately equivalent to a 48mm lens when used on the smaller sensor of the Q/Q10, becomes a more useful 39mm equ. on the larger sensor of the Q7/Q-S1. The 08 Wide also becomes noticeably wider on the larger sensor.

Now, why not the Q7, which seems to be preferred by many because it looks and handles better? Most people consider that the Q7 is technically equivalent to the Q-S1 because they have the same sensor and that the only differences between both models are in the looks. But in fact the Q-S1 is a noticeably improved version of the Q7:
  • It offers continuous autofocus for video recording, while the Q7 doesn't.

  • The image processor has also been updated: the Q-S1 delivers improved JPEGs, with less noise and more detail, especially when you increase the ISO.

  • Response time is better: less wait at switch-on, faster AF and speedier write times.

  • White balance is also better, maybe because the Q-S1 has a stronger IR rejection filter (which makes the Q7 a better candidate if you want to try IR photography, although it would be even better to remove the IR rejecting filter altogether).

  • It seems that the device (auxiliary battery or capacitor) that supplies energy to the internal circuits while the main battery is removed is much more efficient on the Q-S1. On both my Q7 bodies, the clocks resets every time I replace the battery (as it does on my original Q bodies), while I never had this issue with any of my two Q-S1. But maybe it's only because they are obviously newer...


Q-S1 online reviews usually just state that the sensor and the display are the same as on the Q7 but most fail to acknowledge the various improvements between the two models. Here's a link to reviews (in French) demonstrating the differences:

The results of the tests conducted are quite clear IMHO. Let's have a look at the timings first.

Q7:
  • Low light focus: 1.13s

  • Telephoto focus: 0.46s

  • Wide angle focus: 0.54s

  • Photo1 -> photo2: 1.29s

  • OFF -> ON: 1.80s


Q-S1:
  • Low light focus: 0.83s

  • Telephoto focus: 0.32s

  • Wide angle focus: 0.47s

  • Photo1 -> photo2: 1.02s

  • OFF -> ON: 1.58s


And now, let's compare the pictures.

Q7:

Credit: Lesnumeriques.com

Q-S1:

Credit: Lesnumeriques.com

Cheers!

Abbazz
Forum: Pentax Q 12-29-2018, 10:38 PM  
Let's share shots with Q!
Posted By Abbazz
Replies: 6,480
Views: 1,013,970
Some Nikon lenses don't need any adapter to be used on Pentax cameras. The shape of the bayonet is close enough to allow Nikon lenses to engage firmly inside the Pentax bayonet, but without allowing the lens to rotate enough to reach the locking position. The flange focal distance (register) is also quite close between Pentax and Nikon (45.46mm vs. 46.50mm). As the register is longer for Nikon, there is no risk of a Nikon lens not reaching infinity when used on a Pentax bayonet. The only consequence would be that the Nikon lens would not focus quite as close when used on a Pentax bayonet and also that it would focus a little past the infinity mark. But the difference usually doesn't matter, especially for long lenses. See this old thread for details (unfortunately, most pictures are down): Using Nikon F Lenses On Pentax K Bodies (LBA Post): Pentax SLR Talk Forum: Digital Photography Review

I guess it might be possible to put the big Nikon telephoto on a sturdy tripod and to fit a Pentax Q with the Pentax adapter behind the big lens without needing any modification to the adapter or additional hardware.

Cheers!

Abbazz
Forum: Pentax Q 10-11-2018, 04:28 PM  
0.666 Devil's Speed Booster for Pentax Q
Posted By Abbazz
Replies: 41
Views: 7,715
Pentax K bayonet register (45.46mm) is very close to Nikon F (46.5mm). I think it must be possible to exchange the Nikon F mount on the SpeedBooster for a Pentax K mount and then adjust the optical unit (as per the procedure on the Metabones website) to compensate for the difference in register.

Cheers!

Abbazz
Forum: Pentax Q 07-31-2018, 03:50 PM  
Let's share shots with Q!
Posted By Abbazz
Replies: 6,480
Views: 1,013,970
This approach also works best for me. I have tried the "big weather resistant camera and lens" approach in the past but found out that the projections on the front lens were ruining the pictures. A Pentax Q has no water resistance but it's so easy to protect it from the rain while shooting and conceal it in a pocket between shots, that it makes a very good all-weather camera.

Cheers!

Abbazz
Forum: Pentax Q 07-05-2018, 11:38 PM  
Anybody hear about this metabones adapter? f/0.666???
Posted By Abbazz
Replies: 29
Views: 3,730
If I were you, I'd rather wonder why you are the only person to know this! :cool:

Cheers!

Abbazz
Forum: Pentax Q 06-25-2018, 03:27 PM  
0.666 Devil's Speed Booster for Pentax Q
Posted By Abbazz
Replies: 41
Views: 7,715
The 06 lens gives you F/2.8 at its max focal length, which is 45mm. A 50/1.4 lens used with the SpeedBooster gives you F/0.7 at 50mm: that's a 4 stop difference, which is quite appreciable when the light is low!

For example, if you shoot a concert at F/2.8 and 3200 ISO with the 06 lens in order to get an acceptable shutter speed of 1/125s, then if you were shooting the same concert with the SpeedBooster and a 50/1.4 lens, you could have used F/0.7 and 200 ISO with the same shutter speed of 1/125s or opted for 400 ISO and a safer 1/250s shutter speed...

Cheers!

Abbazz
Forum: Pentax Q 06-24-2018, 06:00 PM  
0.666 Devil's Speed Booster for Pentax Q
Posted By Abbazz
Replies: 41
Views: 7,715
It must be doable but maybe not as easy as it seems.

When I received the Pentax Q SpeedBooster, it was not able to properly focus to infinity: max focus was about 30 meters, which makes quite a difference with a 55mm lens at F/1.2. I had to adjust the infinity focus as per the procedure outlined on the Metabones website. This was a bit tricky because I found out that if you oudo the adjustment just a little bit, it can prevent your SpeedBooster from focusing properly. But I guess it means you could replace the Nikon bayonet with a Pentax one and then carefully adjust the focus on the adapter to compensate for the small difference in backfocus between Nikon and Pentax mounts.

Maybe I will try it some day.

Cheers!

Abbazz
Forum: Pentax Q 06-21-2018, 03:22 PM  
0.666 Devil's Speed Booster for Pentax Q
Posted By Abbazz
Replies: 41
Views: 7,715
Apparently, Metabones has created this particular SpeedBooster as an "exercise in style", or a demonstration of its savoir-faire, but it is certainly not going to sell like hot cakes (especially considering the Pentax Q line is now on life support from Pentax). Metabones does not offer any SpeedBooster for Pentax lenses, so the company would have to source K-Mount bayonets as a special order to built a Q666 for Pentax lenses. I don't think it's going to happen.


You're welcome!


Congrats on the Q10. Be warned, these little marvels are addictive... I have now a complete collection of lenses and five bodies: two original Q, one Q7 and two Q-S1!

Cheers!

Abbazz
Forum: Pentax Q 06-14-2018, 03:46 AM  
0.666 Devil's Speed Booster for Pentax Q
Posted By Abbazz
Replies: 41
Views: 7,715
Thank you for your discourteous comment but I am very careful in my choice of words and I am pretty confident there is no error in my post.


"Equivalent focal length" corresponds to no physical measure. It's only a way to remember easily the field of view of a lens on different formats: a 55mm lens on a full frame sensor is "equivalent" to a 27.5mm lens on a M4/3 format sensor. It means that both lenses have the same field of view but not that the effective focal length of the lens changes according to the size of the sensor.

Regarding the false assumption that "no focal reducer makes any lens Wider then [sic] it's [sic] native view angle", see also my answer here.

Cheers!

Abbazz
Forum: Pentax Q 06-14-2018, 03:31 AM  
Anybody hear about this metabones adapter? f/0.666???
Posted By Abbazz
Replies: 29
Views: 3,730
I think you are confusing field of view and focal length. A Focal reducer does just what its name implies: it reduces the focal length of a lens. A 55mm lens in front of the "0.666 Speedbooster" sees its focal length reduced to 27.5mm. It's the same for a teleconverter (focal multiplier): if you put a doubler behind the same 55mm lens, you will get a 110mm lens.

Of course, a focal reducer will increase the field of view of a lens, although there is a limit due to mechanical vignetting and lens coverage. If you put a 35mm full frame lens in front of a full frame sensor, here's what you get:



While the same lens on the same sensor with a speedbooster will give you a wider field of view, although with severe vignetting in the corners:



[Both pictures from DPReview: Old SLR lenses: full-frame, focal reducer, or APS-C?: Digital Photography Review]

Cheers!

Abbazz
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