100% view finder


walkeja

Link Posted 21/07/2015 - 12:00
SteveLedger wrote:
Q for the OP:
Have you added one of these to the K-3?
http://www.pentaxslr.com/accessories/Viewfinder_Loupe_0-ME53

I just ran some tests with my K-50. The OVF and resultant capture are identical. The K-3 is a far superior camera in both build quality and features, it would be extremely unlikely that in terms of OVF coverage/accuracy the K-3 is worse than the K-50.

No, haven't fitted one of those.

Thanks
Pentax K1-ii and MZ6
Pentax Lenses 28-80 F, 300 DA*, 80-200 F, 35 F2.4 AL, M50 F1.7, 28-105 DFA, 20 F4 SMC
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LennyBloke

Link Posted 21/07/2015 - 13:22
I have long accepted that the image captured is not always exactly what I thought I'd seen in the viewfinder. I regularly "visually crop" to remove edge distractions yet sometimes they appear partially in the image file - I've just accepted that this happens and crop in processing.

I suspect that for most people, most of the time, we don't keep an accurate or scientific record of what was where - but Walkeja has raised an interesting topic that hopefully someone will do a thorough scientific study on and present conclusive findings

p.s. I'm surprised nobody suggested that the turbine blade moved between you composing and taking the shot
LennyBloke

MattMatic

Link Posted 21/07/2015 - 14:23
Perhaps there is parallax error? I wear specs and find this fairly often - unless I'm careful and align my eye with the viewfinder I could be out a smidgen. So with a 100% viewfinder the resultant image could be shifted, but not wider (if that makes sense!)

It could be verified by comparing the viewfinder with the LiveView mode.

Just a thought

Matt
http://www.mattmatic.co.uk
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Algernon

Link Posted 21/07/2015 - 17:55
LennyBloke wrote:
........................... - but Walkeja has raised an interesting topic that hopefully someone will do a thorough scientific study on and present conclusive findings

p.s. I'm surprised nobody suggested that the turbine blade moved between you composing and taking the shot

Here! Here! ...... Send Walkeja away for scientific testing

If it wasn't very close to 100% they would not have called it 100%
Trade descriptions and all that

For the record the optical viewfinder on a K-5 is very close to 100%. It does give very slightly more maybe 1% to be on the safe side.

The LV is less than 100% probably 98-99%

You can't have parallax errors either. It's either on the ground glass or it isn't.

The only sensible explanation I can see is that Walkeja has been given a K-3 with an APS-C finder and a FF Sensor by mistake

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

McGregNi

Link Posted 21/07/2015 - 20:09
I think clearly the answer is to get Algi and Walkeja down the pub together for some scientific testing, and to check if the parallax errors increase towards closing time .....

Oh, and we'd need to have some reference selfies ....
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 21/07/2015 - 20:10

Algernon

Link Posted 21/07/2015 - 20:30
I do get parallax errors when I'm down the pub and my camera develops a fault where it cuts peoples heads off on all the shots They also look very blurred and aren't stood up straight

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

McGregNi

Link Posted 21/07/2015 - 21:26
Sounds like a clear case of the AR (alcohol resistance) seals failing and allowing contamination of the horizon correction gyros .... It's a common fault of DSLRs that spend a lot of time in drinking houses !
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver

Algernon

Link Posted 21/07/2015 - 21:34
Plus all the women look to have moustaches through the viewfinder.....
Maybe that's a fault of the pubs I go in

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

redbusa99

Link Posted 21/07/2015 - 23:52
agree with this from lennybloke " I'm surprised nobody suggested that the turbine blade moved between you composing and taking the shot "
here is my instance of something similar, he was not there when i half pressed and just got a quick glimpse as i fully pressed, too late to stop. was after people behind on a bench



odd lens or 2

Flickr

walkeja

Link Posted 22/07/2015 - 10:42
LennyBloke wrote:

p.s. I'm surprised nobody suggested that the turbine blade moved between you composing and taking the shot

Turbine blades weren't moving that day, it was a still air day.

Thanks for the comment.
Pentax K1-ii and MZ6
Pentax Lenses 28-80 F, 300 DA*, 80-200 F, 35 F2.4 AL, M50 F1.7, 28-105 DFA, 20 F4 SMC
ONE UNITED Member

InFESTation

Link Posted 22/07/2015 - 16:06
Can see the hedge line difference, can only think of setting up on a tripod and paper on the wall, set up with it cut to 3:2 format and fill viewfinder take the shot see what is produced.

Have you previously tried experimenting with the sensor shifting function? still in the last position? I would think it resets though.
Pint o' rough & a game o' darts anyone

McGregNi

Link Posted 22/07/2015 - 20:33
Composition adjustment is a saved item in the custom menu 'memory' subsection ....you need to actively reset the sensor position , or not have the memory item checked, in order for the sensor position to restore to fully centred.

The default for composition adjustment is 'on' in the memory settings ...therefore by default any adjustment made would be remembered and restored each time the camera is switched on ...... Hmmmmm ??
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 22/07/2015 - 20:34

richandfleur

Link Posted 22/07/2015 - 23:45
Good point there Nigel.

A composition adjustment would move the sensor, which would therefore create a difference between the optical preview and what the sensor actually captured.

Worth checking it out.

McGregNi

Link Posted 23/07/2015 - 07:15
I'll credit inFESTation just above me for thinking of it first

I'm surprised that the default is to retain a composition adjustment .....I would have thought that after switching off the camera it was more logical to restore the centred sensor position....

It's over to you now, walkeja, to tell us if you have made any composition adjustments, and what your custom menu 'memory' setting is for this ......
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver

walkeja

Link Posted 23/07/2015 - 10:14
McGregNi wrote:
Composition adjustment is a saved item in the custom menu 'memory' subsection ....you need to actively reset the sensor position , or not have the memory item checked, in order for the sensor position to restore to fully centred.

The default for composition adjustment is 'on' in the memory settings ...therefore by default any adjustment made would be remembered and restored each time the camera is switched on ...... Hmmmmm ??

Didn't know there was such a thing on the camera, but I have just checked and switched it off, we will now have to wait and see. Thanks.
Pentax K1-ii and MZ6
Pentax Lenses 28-80 F, 300 DA*, 80-200 F, 35 F2.4 AL, M50 F1.7, 28-105 DFA, 20 F4 SMC
ONE UNITED Member
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