PF Holiday Loyal Site Supporter Special | December Pentax Lens Tournament

simico · 08-21-2012, 01:51 AM - **1 Like**

Originally posted by miltona580

it seems like it consistently underexposes when in TAv mode by somewhere between a quarter and a half stop.

I noticed this when sensitivity steps were set to 1EV steps in custom settings menu C1, so TAv was only able to change ISO in full stops (e.g. ISO100 -> ISO200 -> ISO400 -> ISO800, etc) and in some cases that could lead to 1/2 - 1/3 underexposure (for exmaple because it couldn't set ISO640 instead of ISO400) .
I changed it to the same as EV steps setting in custom menu (C1 -> 1. EV steps), which is set to 1/3 steps for me. So ISO can be changed in 1/3 steps, therefore no more 1/2 - 1/3 underexpose in TAv.

**miltona580** · 08-22-2012, 07:04 AM

Originally posted by simico

I noticed this when sensitivity steps were set to 1EV steps in custom settings menu C1, so TAv was only able to change ISO in full stops (e.g. ISO100 -> ISO200 -> ISO400 -> ISO800, etc) and in some cases that could lead to 1/2 - 1/3 underexposure (for exmaple because it couldn't set ISO640 instead of ISO400) .
I changed it to the same as EV steps setting in custom menu (C1 -> 1. EV steps), which is set to 1/3 steps for me. So ISO can be changed in 1/3 steps, therefore no more 1/2 - 1/3 underexpose in TAv.

I think that is the cause of my problem. Thanks!

Edit - this was definately the cause of my problem. Thanks a lot Simico!

08-22-2012, 07:04 AM	#17
miltona580 Site Supporter Join Date: Apr 2011 Location: Oklahoma Posts: 309 Original Poster	Originally posted by simico I noticed this when sensitivity steps were set to 1EV steps in custom settings menu C1, so TAv was only able to change ISO in full stops (e.g. ISO100 -> ISO200 -> ISO400 -> ISO800, etc) and in some cases that could lead to 1/2 - 1/3 underexposure (for exmaple because it couldn't set ISO640 instead of ISO400) . I changed it to the same as EV steps setting in custom menu (C1 -> 1. EV steps), which is set to 1/3 steps for me. So ISO can be changed in 1/3 steps, therefore no more 1/2 - 1/3 underexpose in TAv. I think that is the cause of my problem. Thanks! Edit - this was definately the cause of my problem. Thanks a lot Simico! Last edited by miltona580; 08-22-2012 at 06:58 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Playback - Slight Delay in Image Becoming Sharp	jwcjrccc	Pentax K-r	7	10-01-2011 08:10 AM
Nature Slight Imperfection	eaglem	Post Your Photos!	7	06-13-2011 11:17 PM
I'm just so upset… (Slight pro-film rant)	TexasLangGenius	General Talk	28	02-25-2011 10:03 PM
People Slight Grimace, Slight Smile	jzietman	Photo Critique	11	04-20-2010 11:52 AM

08-21-2012, 01:51 AM - 1 Like	#16
simico Veteran Member Join Date: Jan 2009 Location: Budapest Posts: 821	Originally posted by miltona580 it seems like it consistently underexposes when in TAv mode by somewhere between a quarter and a half stop. I noticed this when sensitivity steps were set to 1EV steps in custom settings menu C1, so TAv was only able to change ISO in full stops (e.g. ISO100 -> ISO200 -> ISO400 -> ISO800, etc) and in some cases that could lead to 1/2 - 1/3 underexposure (for exmaple because it couldn't set ISO640 instead of ISO400) . I changed it to the same as EV steps setting in custom menu (C1 -> 1. EV steps), which is set to 1/3 steps for me. So ISO can be changed in 1/3 steps, therefore no more 1/2 - 1/3 underexpose in TAv.

Thread Tools	Search this Thread
	Search this Thread: Advanced Search

Slight underexposure

PF Holiday Loyal Site Supporter Special | December Pentax Lens Tournament