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Forum: Pentax SLR Lens Discussion 04-26-2014, 05:48 AM  
Should I buy SMC 100mm if I got Pentax-A 35-105/3.5?
Posted By lubosh.occ
Replies: 8
Views: 1,518
is it the 1:2.8 Pentax-M lens you have in mind? in the review section it comes slightly better rated that the 35-105mm … and i would say it comes down to what your preference is … to have a zoom or prime? and what you want to use it for … if it fits your purpose … or if you just "like having them around, in case the opportunity comes" … my opinion, most prime lenses have slightly better iq, but it could be hard to notice sometimes, there is just too many lenses to say for definite, and can it be justified to carry around 5 prime lenses instead of possibly 2 good enough zooms … especially these M/A that are quite heavy (don't apply if you have a photo bag on wheels
Forum: Pentax K-5 & K-5 II 04-19-2014, 11:56 PM  
Multi exposure
Posted By lubosh.occ
Replies: 5
Views: 1,573
with bracketing you can set the exposure compensation to a set + and - value then when you take the shots it will take 1 with the 1st setting, 1 normal, a 1 with the second seting .. you can set the order in you custom menu, one thing that it's used for is HDR, but some suggest that shooting raw is a lot better .. i don't know, i'd say try it if you interested in that sort of thing and see what works for you …

for software, i never needed anything like photoshop, but tried lightroom, and i've seen elements being favoured by members of photo club, i guess it's the price/value question, for non profit could be hard to justify the price of lightroom + the time to master it, when elements provides more easy to understand tools and is usually sufficient for the needs

my personal favourite is gimp, but thats simply because i use it for lots of other things and the tools it offers are enough for my needs

it's same, you'll need to try few and see for yourself what works best for you …. there will be trial versions available so should be no problem
Forum: Pentax K-5 & K-5 II 04-19-2014, 12:53 PM  
Multi exposure
Posted By lubosh.occ
Replies: 5
Views: 1,573
i think not … it's not how it works, my guess is that it's only saving those single pics in temp, maybe some sort of ram memory or just deleting them afterwards when you finished with the multi exposure, it will combine the temps and save the final pic … in principle for the multi exposure the exposure settings do not change, only what is in the picture changes

bracketing is the opposite, where the settings do change, but it's intended to not change the scene

but of course what you want can be done on a computer …
Forum: Post Your Photos! 04-16-2014, 11:53 AM  
Architecture 31mm perspective and shadow.
Posted By lubosh.occ
Replies: 2
Views: 679
like it … just what is that thing down in the middle? could it be "used" with less sky above, or cropping to 16:9ish/anamorphic with less sky (more building less blue above)

i'm no expert don't take me seriously :)
Forum: Welcomes and Introductions 04-13-2014, 03:44 PM  
Newbie
Posted By lubosh.occ
Replies: 8
Views: 595
and if it is snow have a look on info about exposure compensation … try -1.5 -2
Forum: Welcomes and Introductions 04-12-2014, 05:46 PM  
Newbie
Posted By lubosh.occ
Replies: 8
Views: 595
i think what you need is in the manual on page 112 … the green button to set correct exposure values

or without the green button you can use this [ http://en.wikipedia.org/wiki/Sunny_16_rule ] to estimate the correct values for aperture and shutter speed

on your example the aperture was set (left?) on f4.5 - full open and shutter speed 1/50s, that is quite long for a day and lots of light, so these values must be changed accordingly, you can restrict the amount of light that gets it by closing the aperture, or shorting the time the shutter stays open … or both … in general you want fastest time when there is movement that you want to stop, and close the aperture when you want more depth-of-field (there should be more information about this in the manual as well) you can preview it by turning the on/off switch on Kr further beyond ON there is a picture of aperture blades on that switch for this (it'll close the aperture without taking picture, even if you do dof preview on display instead of the viewfinder that picture is not recorded

is it snow? all that white? if it is, then you might benefit from also adding a filter on your lens maybe UV and Circular Polariser(CPL) is quite handy to have if you take photos outside … just don't buy any of the extra cheap ones, they tend to make no to very little difference
Forum: Troubleshooting and Beginner Help 04-12-2014, 10:46 AM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
so, changing firmware (any version) had exactly no effect :) crossed off the list
Forum: Troubleshooting and Beginner Help 04-08-2014, 09:31 AM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
it's definitely the second one, the fault is magically not preset with the FA lens :)




i did try the reset, no change, AF button only works same as shutter, it's ok with power zoom, no action with DA …




hmm … so the AF doesn't work with DA in normal mode either, it will not confirm focus, only after the use aperture ring is enabled it will confirm focus …

well i don't know about the firmware this is a second hand, i bought it with this issue, but the fact about the power zoom wash't known to the seller as he had not had any power zoom lenses to try this, it reports as 1.31 firmware, i am aware of the hack procedure with the modified binaries, but i don't think there is any actually hacked firmware (in a sense that would include some improvements or new functions to the original firmware) just that some ppl reverted back to 1.20 to be able to use sdm, but i was thinking since i don't have a way to know what is actually loaded that it would be worth a try … in the past the solution was usually the one thing not tried … even when it made no sense to try at all at first … thats the magic again :)

catch-in-focus works as well … :)

thank you … as i said, i don't mind using the camera as is since i've got the 20 that works fine with new lenses, but i'm very curious as this problem just doesn't make sense

thank you
Forum: Troubleshooting and Beginner Help 04-07-2014, 11:47 PM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
Hi rwingsfan,

you got it right, the reason why having the aperture ring enabled in the custom menu all the time is not a solution, is because:

- with "use aperture ring" enabled in custom menu, and the DA lens, the AF works fine, but the camera will always use the stay wide open aperture (even though i can hear the actuator moving), and same for the F lens, and same for the A lens(the A has no af but the aperture will not close), the F and A lenses will work only in the full manual (M) mode … thats when the aperture will close as it should

---------- Post added 04-07-14 at 11:57 PM ----------


sorry forgot to put at that point the aperture is set with the ring on the lens, so basically the DA lens will always stay wide open … that made me think it could be a problem with the pin that actually communicates the aperture … but then again … why would it work with the power zoom lens? i guess it's using the same pin, and the only difference is the two contacts that power it's built in motor … at that point i've no idea what could be causing this :)

last thing i thought of was to downgrade the firmware and re-update it .. not sure if the firmware could be corrupted in a way it would affect this … :)

thank you
Forum: Troubleshooting and Beginner Help 04-07-2014, 09:44 PM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
Hi Steve,

it's ok up to the point with half press (3rd point from the bottom of the list) as nothing happens from that point on, no motor sound with da or f lenses, and won't get the focus confirmation with any A lens either, tried with 3 different batteries, all fully charged (pulled 1 from the k20d)

but doing following the same checklist and using the fa power zoom, will pass ok through all the points

thank you
Forum: Welcomes and Introductions 04-07-2014, 02:17 PM  
Newbie
Posted By lubosh.occ
Replies: 8
Views: 595
Hi Libby,

can you post on of the white photos, so i can have a look at the exif data
&
what lens you using with yours Kr?

---------- Post added 04-07-14 at 02:18 PM ----------

*** one of ***
Forum: Troubleshooting and Beginner Help 04-07-2014, 02:08 PM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
oh, ok, i thought that da, f, fa lenses should work with autofocus without enabling 'use aperture ring' in the custom menu, i cannot even find any da lenses that would have the aperture ring, does that mean that the da lenses are not supposed to work with dslr cameras?

sorry for that, i know you're trying to help, but i feel you're missing what my question was :-) ... lets pretend for a minute that i know what i'm talking about, i'm not trying to figure out the normal mode of operation ... i'll put the issue in the most simplistic way i can

i've got the k10d on with just the normal settings, like it was just reset to default, af mode is af.s, left selector is on p, i've got the 18-55mm lens pentax-da II, the meter works i can se it calculate the a and t values, but when i pres the shutter nothing will happen, af won't work, dof wont work, if i change the af selector to mf the shutter would still not take a picture

now if i simply swap the lens for pentax-fa 28-80mm power zoom everything works, af, dof, shutter as normal

the lenses are fine, both work on a k20d, i've already cleaned the contacts on lenses and camera, but that has no effect

is there any explanatinon that makes sense as to why

---------- Post added 04-07-14 at 02:12 PM ----------

one works and the other not? … is there anything so different that would make the power zoom to work even thought theres is something wrong with the camera that would affect the da lens?
Forum: Troubleshooting and Beginner Help 04-07-2014, 01:06 PM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
no, sorry that is not really an issue, the problem is that any of the lenses I have DA, F, A won't work without the aperture ring being enabled in Custom Menu, but the power zoom lens does work … i know the problem is not the lenses because they all work as they should on k20d, so it's the k10d, but i don't understand how is it possible if something is causing the DA, F, A lenses not to work(no reaction to shutter being pressed, no af confirm in the viewfinder) and the FA power zoom works fine

stopped-down aperture setting works as it should, but it's not the normal mode of operation i would like to use with DA, F, A lenses

sorry if the question is a bit confusing, it is a confusing problem :)

---------- Post added 04-07-14 at 01:15 PM ----------

- i can use any lens with the aperture ring (M, A, F, FA), when i enable the Aperture ring in Custom menu, but only in M mode, with stopped-down metering
Forum: Troubleshooting and Beginner Help 04-07-2014, 11:56 AM  
K10D - Autofocus and Aperture strange behaviour
Posted By lubosh.occ
Replies: 13
Views: 1,501
Hi, just wondered if anyone has experienced something similar or can suggest a fix for this "problem".

I have a K10D that will (not):
- with a Pentax DA 18-55mm / Pentax DA 50-200mm WR (or any other A, F, FA - even though I've not tried every single one of the lenses) when set to any mode (P, Sv, Tv, Av, Tav, M, B, X) and any AF (AF.S, AF.C and even MF) take picture, the metering works, but it will ignore the half press or full or DOF preview, but when I enable the Aperture Ring in C menu it will autofocus, and will react to half/full press and even makes seems to actuate the DOF preview, but the aperture will stay wide open; AF.S, AF.C, MF works as it should, it's same with all modes, shutter speed will adjust according to aperture set but when the picture is taken the aperture stays open, shutter is according to metering and EXIF has these values recorded as such

- and the only exception to the above seems to be power zoom lenses (only have one, Pentax-FA 1:3.5-4.7 28-80, but i guess it would be same with any pz lens) - this lens works as it should with any mode, any af setting and with aperture ring setting disabled, it will AF, reacts to half/full press and DOF works as it should, basically this lens works in the full auto mode, mine is missing the selector switch so not sure what is the default setting on the lens itself, but it won't work in the power zoom mode (that to my understanding could be due to the 1.31 firmware) but other than that it works

I've tried to clean contacts on lenses and he camera and also know the lenses (DA, F) work fine on mine K20D so the problem must be with the K10D but i just cannot find any information what could be the reason behind this strange behaviour … if the power zooms works in auto, then everything should …

I'll appreciate any suggestions as to what to try to fix this or at least would like to know what could be the reason behind this so all ideas are welcome (other than that I don't mind, I do like to have it as M lens camera only, but at the same time I'm very curious) :cool:

thank you!
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