Originally posted by bwgv001 got a 2nd camera? take notes that way, even cell phone should be enough
I think it is unlikely that I will do this
The size and bulk of the
K1
short ext tube
Bellows
105mm macro
Ringflash
Diffuser
Handholding this lot requires 2 hands, which leaves me short a hand or 2 for taking notes, which is also veering off course for the original question, which was,
Is there a correct method for working out the focal length in relation to using ext tubes and SR.
Is it just the amount of extension, do you ignore the extension, is there an accepted standard way, or is it trial and error.
---------- Post added 08-30-18 at 01:56 AM ----------
Originally posted by Fogel70 For SR to really work for macro you need a camera with 5-axis SR, and for 5-axis SR to work you need a lens that report focus distance to the camera. Without focus distance information 5-axis SR will be limited to 3-axis.
I do not believe your equipment will support 5-axis SR so you will not have very efficient SR for macro.
The reason is that for high magnification shots it is horisontal and vertical shifts that dominates camera shake and it varies with magnification. On normal shots with lower magnification it is pitch and yaw camera shake that dominates and it varies by focal length.
You can try using longer focal length for SR than the lens have so it overcompensate for pitch a yaw, which may help for horisontal and vertical shift. Try 2-3x the lens focal length. How much you need to use will vary with magnification, so it is not very practical as you may have to change the focal length on the camera between shots. It may also vary on how you hold the camera so it will probably be difficult to find out which focal length is best to use for each shot.
Well that at least makes sense to me, a very well explained answer.
It does raise some other questions
If using 2x or 3x fl for for SR input would 1x the fl guide for shutter speed apply,
So for a 100mm macro with whatever extension, need a shutter speed of 1/300th or there abouts.
I only ask as I thought that at higher shutter speeds the SR became redundant.
I will give it a go though and see if there is any difference.
As there seems to be no actual prescribed method, I wonder if the question shouldn't be what do you do ?