thank you all for your precious comments
Since Sal introduced the sight/eyesight issue and most of your following comments were around this argument i start with this
you exactly hit the centre :-)
I was not posing, i was really adjusting the shutter speed... :-(
When i talked about "composing the scene" i was saying that the 4x5 Gg maybe is too little for me and the loupe i usually use ..Hasselblad 6x loupe (i feel very confortable looking into it ) is too big for a 4x5 GG - Without it I just see nothing. Fog
I have a standard +4.5 hypermetropia so i daily use contact lenses BUT when i have to read something ( books, documents, ...shutter speed..) i have to wear the red glasses you see in the picture since I have a little presbyopia too ( +1.5) . So when i look into the GG i have to use glasses, when i have to see into the loope i have to take them off... then i have to use them again to see aperture and speed.. UFF just tiring :-))
Maybe with a 5x7" i could have less problems ; i could work withoup a loupe ( or now and again ) and feel much confortable in terms of composing the scene
I say it again: to go for 5x7 format is not a bigger negative issue for me. Just a more confortable way to take photographs
Could it be the right choice for me?
ps well i know 8x10 and more could it be better. but as i said when i climb or i go around mountains i have no possibility to have sherpas ))
So lighweight is vital.
@Vaughn: thanks for your remarks and experience
@Rol Domaz Roger dupont and others thanks again