Originally posted by normhead Camera marketers. Using old lenses is not part of the business model. The model is tell people they can use their old lenses and then wait until their will breaks down and they start buying new ones. It worked on my. I had a Tamron 18-300 that was my travel lens on film. I bought the *ist so I could continue using it. But I also bought a Sigma 70-300. I used the old Tamron exactly once. That was enough.
I'm not a fan of old lenses. Never was and never will be. I like to work with new and fast lenses rather than dealing with the common problems of old lenses (chromatic aberations, not that sharp wide open, not that fast to focus, etc.). I know exactly what lenses I need for what I shoot and I don't buy lenses that I will use just a few times in a year. For those situation I have the renting option that allows me to rent the best lens I need for a specific task.
I use f4 zoom lenses due to the fact that the f4 zoom lenses are sharp, small, light and decent in terms of price. And I use fast L primes when I have paid shooting sessions. I don't use f2.8 zoom lenses due to: size, weight and due to the fact that a 70-200mm f2.8 lens for example will get you noticed right away and people tend not to be comfortable at corporate events when someone is pointing a big lens on them. Primes are more discret, also lighter and faster. The 85mm f1.4L lens will also keep my ISO lower than an f2.8 lens or it will help me have a faster shutter speed. I tend not to use flash so a fast aperture helps me in this regard.
This is just me and others shoot only with f2.8 lenses and get excelent results. I saw what a 400mm f2.8 lens did on my 6D a few years ago and since then I understood that if I want performance, old and vintage lenses will not make my life easier.
Even with this in mind I also shoot a lot with the 85mm f1.8 lens which costs 15% of the 85mm f1.4L lens because it's light and good enough for going out shooting portraits with friends. But for paid jobs it stays at home.
When I hear people telling me that I have to invest in 5 RF lenses if I go to mirrorless route, first I make sure that I really need to do this. The new RF 85mm f1.2L lens will have to be really and I mean really good compared to EF 85mm f1.4L lens which was released one and a half years ago. If I see a noticeable difference on EOS R between these 2 lenses, then I will have some decisions to make knowing also that a pro Canon mirrorless camera is around the corner. But, for the moment there are no equivalent RF lenses that I can compare to my EF lenses and my EF lenses work on EOS R as good as they work on 5D Mark IV. If the new RF equivalent lenses and the upcomming Canon mirrorless cameras will make a difference, then I start working on the investment plan. A fixed percentage from my paid shootings is going for investements (lenses, cameras and accesories) and I have half of the budget ready and the other half of the budget will be covered by selling the EF lenses if I decide to go on the mirrorless route. The EVF is giving me some trouble... In another topic I was talking about familiarity in shooting with my gear. Shooting with EOS R is a learning curve even for me, a Canon shooter, and I will try and learn the new system before making a huge investment in 4-6 RF lenses. I still hope that Canon will release a 5D Mark V so that I can postpone the decision for another 4 years. By then mirrorless will probably become a mature system on Canon and I will learn by then to deal with EVF.
Who knows, maybe smartphones will be our future cameras and medium format cameras will replace APS-C and full frame cameras.