hi thanks for your advice.i must tell you a little bit bit about the background of carpet photography.If you already have a workflow that you were using and you want to keep the same methods, and the only thing different is you are now using a full frame camera, then I would advise either a 24-70 or 24-105 lens would work fine for you. Remember that on a 600d, an 18mm lens is around 28mm on full frame. (In your case I think I would go for the Canon 24-105 which has image stabilization in the lens and could be quite useful for you. Also Tamron makes a 24-70 lens with image stabilization).
we used to shoot all our carpets with canon efs 18-135 mm lens with a canon 600 d.cheap camera and cheap lens.
18mm was just enough to capture bigger carpets in its focus.as we used to climb a ladder and take photos.
now i want to upgrade to a higher gear ,i took some photography lessons ,i am not pro but understand the basics.
i will be helpful if you recommend 1 good lens to take all photos with a resonable amount of detail for ecommerce website.as we have 2000 carpets and every 3 month carpets changes ,i think it will be to costly and time consuming to keep changing lenses.if i have an option i will have one lens .macro shots can be dealt later.if you still think i need more than please dont hesitate advicing me ,i shall be thank ful to you.
please rememebr that 18 mm -135 mm lens did our jobin getting whole carpet in the camera @ 18mm .
since i am going to buy mk 2 or mk 3 please advice me a good lens with similar focal length?
i have heard that to take good quality pictures i need higher f stops of aprreature to take everything in detail .if thats true do i need to invest in expensive lenses like f1.2 ,if i want to use larger appreature dont you think any lens with f4 will do ?
For your purposes, no, you do not need to invest in 1.2 lenses. F/4 is plenty. If you want everything to be in focus, yes, you will need to use higher aperture values.
Since you mention that you are displaying these photo on a website, and you are not printing these for a catalog, then I am wondering if you even need a full frame camera. It certainly will not hurt. But I am wondering, do you feel your current equipment is not providing you enough quality that you want to go to full frame? For web sized display, it might be hard to tell the difference.