Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 161 Search:
Forum: Flashes, Lighting, and Studio 03-27-2018, 11:22 AM  
Canon Speedlite with Pentax 645Z
Posted By jonby
Replies: 4
Views: 688
I'm pretty sure the 430EX will work directly in the hot shoe also, but with purely manual power control only of course. I have used the Canon 580EX II on a Pentax DSLR many times with no problems.
Forum: Film Processing, Scanning, and Darkroom 03-26-2018, 11:44 AM  
Total newbie, how to set enlarger contrast with a colour head?
Posted By jonby
Replies: 13
Views: 1,635
The contrast is controlled on the magenta-yellow scale. If you want more contrast, add magenta. If you want less contrast, add yellow. Adding either will reduce exposure and you will have to compensate by giving a longer exposure time. If you want to keep exposure times a bit more consistent, then start with both of them at a mid setting and when you increase one, decrease the other. It's actually the difference between the two which gives you the amount of contrast, with roughly 'normal' contrast achieved when you have the same amount of yellow and magenta.
Forum: Pentax Camera and Field Accessories 02-24-2018, 09:42 AM  
Looking for a light but sturdy tripod
Posted By jonby
Replies: 28
Views: 1,566
What will be the best choice for you will depend on the compromises you want to make in order to get something lighter I guess. For me, I much prefer to have something which will get close to head height without using the central column, since using the central column dramatically reduces vibration resistance the more you extend it. It's way more comfortable to work close to head height when you can. So it's worth thinking about how high you need it to go to match your own height, and whether you mind having to use the column to get it to that height.

I have a Manfrotto 055 for heavier duty tasks, but I have a Velbon Sherpa 550R for trekking and more general use, which I got for around 30 on Ebay. Not sure if this exact model is still available, but there are current variants of it. The Sherpa is very nicely built and with head, goes to 129cm without column and 154cm with. Collapsed length with head is 63cm. It has a split column and three leg angles, allowing you to get down to 29cm. Weight is 2.1kg with head, 1.6kg without. This has been a good tripod for me, offering a good compromise between size, weight, height, stability and ease of set-up. It's substantially smaller and lighter than the Manfrotto. It would be nice if it collapsed a bit smaller and was a little lighter but I wouldn't want to reduce stability any further personally. One feature I miss is a foam tube on one of the legs - this is nice to have in cold weather.

The Slik 150 already mentioned does look like an interesting option - it goes slightly higher than this sherpa with the column, though looking at it, I think much of that height comes from the column. It's much lighter than the sherpa, which is impressive, but I do wonder how stable it would be. I personally find four-section legs a bit of a pain and more wobbly than three.

Not sure if these are available where you are, but I have just been looking at these: K & F Concept TM2324 - 54 on Amazon uk. Shorter folded length than the Slik, around the same weight and I think the shoulder height might be a bit higher. Reviews are universally good. I'd definitely consider one of these if I wanted something smaller and lighter than the sherpa.
Forum: Pentax Medium Format 02-02-2018, 12:44 PM  
New 645z in 2018?
Posted By jonby
Replies: 83
Views: 14,800
I think it's highly unlikely that Pentax will go mirrorless with MF at this stage. Apart from a completely new camera, that would require a completely new lens range. There's still a substantial market for DSLRs in MF - they just need to capitalise on that. There is a fair bit of wiggle room in price between the Z and the next cheapest DSLR, so there is some scope to beat the competition even if they have to raise the price a bit. The main reasons people in that market go for other brands as far as I can see are: higher speed flash sync, tethering support, more top-performing lenses and better pro support structure (plus existing investment in lenses etc, but you can't do anything about that). So it would certainly help if Pentax could address any of these whilst also making the usual incremental improvements.

On the flash sync issue, a new leaf shutter lens would help, or at least working with a flash manufacturer to provide HSS with an existing flash system. On the tethering side, well, they are unlikely to get Phase One to include support, so maybe working with Adobe to produce a decent Lightroom plugin would be a decent compromise.

IBIS is perhaps the other realistic possibility. This would certainly fit in with the perception of the camera as an outdoor machine, and be a first within the market. This would of course also potentially bring pixel shift and AA simulation to add to the list.
Forum: Digital Processing, Software, and Printing 12-13-2017, 01:00 PM  
MacBook Pro 13 mid 2017
Posted By jonby
Replies: 10
Views: 1,571
Just started using a 2017 13" Macbook Pro with my work. I was a bit worried about the screen size because I previously had a 15" 2011 model. What I'd say is that if you have good eyes, I wouldn't worry about the physical size, because the resolution is pretty high (2560 x 1600), which gives you a lot of screen space as long as you don't mind small icons and text. I have also found it to be pretty fast - many times faster than my previous machine - though I haven't really tried any heavy editing yet. I'd get 16GB of RAM if you can afford it though - that's the main thing that will hold you back when editing in Photoshop.
Forum: Pentax SLR Lens Discussion 12-10-2017, 10:11 AM  
Macro lenses for landscape?
Posted By jonby
Replies: 57
Views: 3,903
Well, the performance of any lens 'can be improved', but if you are saying that a lens performing well at infinity means that it is optimized for long focusing distances and therefore will perform worse at close range, then that is not true. It may be optimized for close range, but still perform well enough at long distances to perform 'well'.

Since you have the means to check this yourself, why don't you try it? You have heard from lots of people here who have, and who dispute what you are saying. I am another. We are not going to be swayed by theoretical arguments when our own experience says different.

My (uninformed) belief has always been that it is harder to engineer a lens which performs well at extreme magnifications than at infinity, so macro lenses are generally made to higher specifications in order to get good quality at close range, and this has the side benefit of increasing quality at long range also, even if it is not optimized for long range. This is really just an educated guess though, which I have arrived at through using lots of these lenses. If it was easy to make lenses perform well in the macro range, then I would have expected to see some manufacturers producing a cheap macro option which is not over-engineered to give good results at longer ranges also, but I never have.
Forum: Flashes, Lighting, and Studio 12-09-2017, 09:53 AM  
A good starter kit for on-location shooting
Posted By jonby
Replies: 59
Views: 6,990
Glad the AD360 is working well for you. This thread is pretty old, so it's great to see some kind of conclusion to it after all this time. These are nice shots. What modifiers did you go with in the end? And how are they working out?
Forum: Pentax DSLR Discussion 12-08-2017, 02:05 PM  
KP vs K-70 - to KP or not to KP, that is the question
Posted By jonby
Replies: 19
Views: 5,585
The K-70 is a great value proposition - really excellent camera for the money from what I can tell (haven't used one). I think I'd recommend getting this and using the money you save compared to the KP on a lens. Have you thought about the 16-85? It's a bit more money than the 18-135 but if you care about image quality towards the edges, it's a lot better. Image quality difference between these cameras will be negligible compared to the difference between lenses.
Forum: Pentax K-1 08-04-2016, 05:38 AM  
Pentax K-1 new firmware suggestions
Posted By jonby
Replies: 144
Views: 11,990
I agree that some further options for RAW file quality and size would be desirable - especially with such a high resolution sensor. Personally I would never want to shoot in JPEG, but do sometimes want to reduce the amount of storage space required for non-critical work. Both reduced size and lossy compressed RAW options would be useful for me. I have used Canon's M-Raw format in the past and found it useful, though it's not that efficient (look at the numbers - less than half the pixels but two thirds of the file size).

Having worked with the compressed DNG format available through Lightroom, DNG converter etc, I find this offers a very high quality-to-file-size ratio which is far preferable to JPEG compression, maintaining much higher dynamic range and post-processing flexibility and of course being free from sharpening, noise reduction and other in-camera-processing artifacts. Of course you can convert files in post, but this takes time and you don't get the additional card space while shooting. Perhaps there would be a performance hit by using this kind of compression, but if it's just an option, I don't see the problem.

Either way, yes - size, bit-depth and lossy/lossless options could all be welcome if implemented well (Nikon's long list of combinations is a bit confusing and probably not the best way to do it). If there's a slight performance hit to deal with the compression then I personally wouldn't mind. I would have thought these could be implemented via firmware, though not being a camera engineer, I'm not sure.
Forum: Flashes, Lighting, and Studio 11-03-2015, 12:05 PM  
A good starter kit for on-location shooting
Posted By jonby
Replies: 59
Views: 6,990
Yes this probably will be a bit small for small groups, but it depends on what kind of light you're after. You have the option of a large umbrella to get more diffusion (not good if it's windy), or getting a speedring adapter to take larger softboxes. Godox make one which takes Bowens S-type modifiers and supports the AD360, as well as standard speedlights.
Forum: Flashes, Lighting, and Studio 11-02-2015, 06:46 PM  
A good starter kit for on-location shooting
Posted By jonby
Replies: 59
Views: 6,990
Depends on many things - modifiers used, brightness of ambient light, distance from subject. Yes this is the cheap option since you have a number of speedlights already, but personally I would find managing the settings and sync on this number of flashes, plus managing all the batteries, a real pain. That's why I was wondering if the bare bulb units might be the best for you, such as the Godox Witstro AD360 or equivalent. I think it has the power of at least four speedlights and will be so much more convenient. Failing that, it's a studio head and battery pack, which is likely to be more money.
Forum: Flashes, Lighting, and Studio 11-02-2015, 01:39 PM  
A good starter kit for on-location shooting
Posted By jonby
Replies: 59
Views: 6,990
If you want cheap and lightweight then the standard manual-only speedlights should do the job. Get ones with high guide number (50-60) but which go down to 1/125th power - this should give you the ability to work with fast apertures but also overpower strongish daylight if you need to.

For triggering, you can go with basic sync-only manual radio triggers, or the dedicated systems which allow you to control power and/or zoom from the camera position. Some flash guns have a radio receiver built-in, which is really convenient and reduces the amount of gear you have to take and batteries you have to manage. Personally I would either go for the Yongnuo YN560 III/IV plus YN560 TX controller, or the Cactus RF60 plus V6 controller. The former are so cheap that I'd recommend getting two flashes to have one as a backup/auxiliary.

If you're using speedlights you will need to get a bracket to connect the flashes to a light stand. These usually allow for using an umbrella, but if you want to avoid too much light spill then a softbox is probably better. The collapsible ones which clamp onto the flash head will be the most convenient. 50cm sounds about right.

Another option which is quite a bit more expensive but better and more versatile in the long run is the cheaper bare-bulb hotshoe units. (Godox, Neewer, Calumet-branded). These run off Lithium-Ion battery packs and are more powerful than standard speedlights. They also have a proper fitting for modifiers such as beauty dishes. These are a bit heavier than speedlights but not by much, and you are less likely to run out of power or battery. The recycle time is also a lot faster at higher power settings. If I was doing a lot of location lighting, I'd get a set of these.

If you're only using one strobe then get a reflector such as the collapsible disc type - helpful for filling in shadows.
Forum: Pentax K-30 & K-50 09-15-2015, 11:17 AM  
Pentax K-30 Live View Bugs Me...
Posted By jonby
Replies: 10
Views: 1,266
Can't help the OP unfortunately, but it sounds from what davleema says that you are probably experiencing normal behaviour. Sorry to piggy back on this thread, but does anyone know if the resolution/clarity of magnified live view is any better in more recent/higher spec Pentax models? This is important to me and will be a determining factor in any new camera purchase I make. I'm no Canon fan, but I have found the magnified live view on all the Canon cameras I have used to be very good. The same thing on a Fuji X100T I tried was significantly worse. My current Pentax model (K10D) doesn't have it at all.
Forum: Pentax DSLR Discussion 09-09-2015, 11:13 AM  
I think there should be more Hyper in the Green Button
Posted By jonby
Replies: 11
Views: 1,357
Although I haven't used one, I believe that the Z-1 and Z-1p SLRs used to work the way you describe - ie. whichever dial you turned last, that became the 'primary', value, and pressing the green button shifted the other value. This is different to how it works on the twin-dial Pentax DSLRs, as you say, where the choice of 'primary' value is set via menus.

Personally, I agree that this would be a good way to do things, and have often wondered why Pentax changed this behaviour. It could at least be offered as a fourth option in the menus. The hyper manual mode is one thing which for me sets Pentax cameras apart from any other, and I stay in manual mode almost all the time because of the speed and flexibility it offers. However, I think having your suggestion as an option could make it even better.



The OP's suggestion really doesn't 'muck up' the manual mode. He's just suggesting a variation on the behaviour which is already present. If you want to control both exposure values totally manually, you can - just don't press the green button.
Forum: Pentax SLR Lens Discussion 08-12-2015, 05:40 PM  
Thoughts on the crippled K mount.
Posted By jonby
Replies: 17
Views: 1,951
Assuming it's not possible to automate aperture control with any of the methods suggested, I have a few other suggestions for improvements in the handling of K/M lenses which wouldn't require any major changes/technical challenges.

Regarding the problem of the aperture value not being recorded in EXIF with K/M lenses, my suggestion would be to deal with it in the following way: when a K/M lens is mounted, the camera allows you to use the e-dial as normal to set the recorded aperture, which is shown in the usual places in the VF, top LCD and back LCD. It is then up to the user to simply match this to the aperture set on the lens ring. Whatever aperture is set on the camera when the exposure is made is recorded in the EXIF. I guess this could be seen as confusing behaviour to some users so perhaps it would need to be enabled in the setup options. It would probably be a good idea to have a small 'warning' mark next to the aperture value to remind you that the displayed value is not necessarily the actual value in use. But I think this would be a really simple way to do it. If my understanding is correct, then if there were also a way to input the maximum aperture for the lens in use, then it would be possible for the camera to display a manual exposure meter reading based on the displayed aperture, as per normal manual mode behaviour. This would mean that you could half-press the shutter button to begin metering, set the shutter speed and aperture while watching the meter as normal, and then just set the corresponding aperture on the lens before taking a shot. This could even give you a form of aperture priority - as long as the aperture set on the camera matches that on the lens then the camera could set the shutter speed.

It would also be useful to be able to set and record focal length in EXIF when not using SR, as the OP suggests. As a regular tripod and K/M lens user I find it frustrating that FL is not recorded. Not quite sure of the best way to do this. A setup option to force the SR setting to be recorded whenever a K/M lens is in use, even if SR is disabled, would be a start, but there should also be an easier way to change it without going into the menus, as this is too slow when changing FL on the fly with a zoom lens. One way would be to have it as one of the 'quick menu' options.

---------- Post added 08-12-15 at 05:45 PM ----------



I think we're suggesting more or less the same thing here. I was writing mine as you were writing yours.
Forum: Pentax DSLR Discussion 07-29-2015, 12:16 PM  
Unique Pentax features
Posted By jonby
Replies: 37
Views: 3,358
Hope it works. Like I say, these things work on a K10D but I haven't had the opportunity to try them on a recent Pentax. I'll be disappointed when I get round to upgrading and they haven't kept them. It's amazing how these little things, which don't show up in spec sheets or reviews, can make a big difference in use.
Forum: Pentax DSLR Discussion 07-27-2015, 06:45 PM  
Unique Pentax features
Posted By jonby
Replies: 37
Views: 3,358
I'm still using the K10D, but I think these things are still available on the K-3: Hyper-manual exposure - press the green button when in manual mode to jump shutter speed to the camera-suggested exposure, then tweak from there. I use this all the time. Don't think Canikon have it. Also while in manual mode, pressing the exposure lock button and turning one of the dials changes shutter/aperture combinations while maintaining current exposure. These are two reasons I almost never leave manual mode on Pentax.
Forum: Pentax SLR Lens Discussion 07-14-2015, 03:37 PM  
LensRentals: Variance Measurement for 35mm SLR Lenses
Posted By jonby
Replies: 2
Views: 978
Shame that Pentax aren't represented here - I would have been interested to compare with the others.
Forum: Pentax Full Frame 07-13-2015, 11:25 AM  
A recent full frame experience
Posted By jonby
Replies: 110
Views: 14,744
Yes that would be great - at last a focusing screen which you can actually focus with. Do you think this is likely though?

If it could be done then I guess one issue would be that the viewfinder would go dimmer while autofocusing, which would no doubt bother some people (not me).
Forum: Pentax K-3 07-12-2015, 10:39 AM  
K3ii shutter vibration.
Posted By jonby
Replies: 15
Views: 2,712
Thanks for this info. Sounds like you are doing all that can be done to address the problem.
Forum: Pentax K-3 07-12-2015, 08:19 AM  
K3ii shutter vibration.
Posted By jonby
Replies: 15
Views: 2,712
Yes I was thinking that it would be better to set SR to a lower than normal value, since it is designed for hand-holding, where the amplitude of movement is going to much greater than using the hand-triggered-on-a-tripod method. I haven't tested this though.



That sounds like it could help. Something with some internal resonance which actually absorbs and counters the vibration is what's needed generally, and this could help with that. Heavy solid objects above the shoulder of the tripod slow and lengthen the vibration rather than actually counteracting it. This should in theory work for higher shutter speeds, but could potentially make things worse for lower speeds. All in all, vibration and its affect on images is very complex and every camera/lens/support system combination will behave differently so it's pretty hard to develop a strategy which works all the time. Thankfully shutter vibration is pretty low in recent Pentax DSLRs, so if you are shooting static subjects and can use mirror lockup it's much less of a problem than it used to be.

---------- Post added 07-12-15 at 08:27 AM ----------



Would the electronic shutter with mirror lock option be of any use? I'm guessing not because you will be shooting moving subjects.
Forum: Pentax K-3 07-12-2015, 06:52 AM  
K3ii shutter vibration.
Posted By jonby
Replies: 15
Views: 2,712
Here's a diagram to show what I mean here. It's not scientific but hopefully illustrates the principles at play. I have done quite a lot of testing for vibration (and trying to get around it), so this is based on some practical knowledge.
Forum: Pentax K-3 07-12-2015, 06:05 AM  
K3ii shutter vibration.
Posted By jonby
Replies: 15
Views: 2,712
I haven't seen any indication that the K3II uses a different shutter/mirror mechanism, so it seems unlikely that there will be any difference, as Adam suggests. However, one thing which would make a difference is the electronic shutter available on the II. I haven't been able to determine whether ES can be engaged for normal shooting though, or whether it is only available in pixel shift mode. If it's the former, then this should completely eliminate any vibration problems, if used with mirror lock. Your only problem would be rolling shutter effect in moving subjects. If it's the latter, it could still be used but you would have to extract a single frame from the (very large) raw file.

However, given your description of the difference between live view and viewfinder shooting, it sounds like the vibrations you are getting are coming from the mirror not the shutter, assuming you weren't using mirror lock. If so you should try using mirror lock when shooting through the viewfinder.

Another thing you could try is to engage SR, which may actually help in the higher shutter speeds, despite this being contrary to popular wisdom that you should not use SR on a tripod.

Finally, changing the resonance characteristics of your tripod support could help. A very heavy and solid setup transmits the first vibration back to the camera quicker than a sloppy setup, meaning that the camera can actually move more within very short exposures. It's worth doing some further tests at the higher speeds either with a lighter tripod or with the column extended. I have also found that it's better at the higher speeds to use the normal shutter release and actually apply some downwards pressure to the camera. You will get more movement overall, but potentially less within the short exposure period.
Forum: Pentax Film SLR Discussion 07-11-2015, 04:15 AM  
Which autofocus body to complement my Spotmatic?
Posted By jonby
Replies: 39
Views: 4,552
I find the manual focusing on my copy of the F35-70 quite a bit better than most AF lenses I have used actually. The throw between equivalent distance scale points is approximately 3x that on the 16-45 and 18-55 (original), with a decent distance scale. The ring is quite smooth to turn with no jittering and hardly any play as you change directions - certainly better than the other two lenses I have mentioned, and way better than my FA 28-70 F4, which is horrible. The zoom ring on the other hand isn't nice at all - I guess you can't have everything.
Forum: Pentax Film SLR Discussion 07-10-2015, 06:52 AM  
Which autofocus body to complement my Spotmatic?
Posted By jonby
Replies: 39
Views: 4,552
Sounds like you got a bargain! Hope the camera works out well for you. Would be interested to know how you get on with it.
Search took 0.01 seconds | Showing results 1 to 25 of 161

 
Forum Jump


All times are GMT -7. The time now is 04:36 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top