Thanks for that and I agree with Sony on the A or E mount plus I think there is another for the NEW camera then you have the Minolta which is supposed to fit my camera but all I have seen are too small.
I will go looking for your suggestions. I hope some time next year I can get one.
Sony made life complicated. I used to own an Alpha 100 and then Alpha 350 so I know the pain.
Potted info:
Back in the 70s and 80s Minolta made film SLRs with the MD lens mount. (They have no electronic contacts on the lens mount)
Then they started producing Auto Focus cameras and lenses under the "Dynax" and "Alpha" model names. Most lenses say "AF" in the model name and there are some brilliant lenses in the back catalogue.
Sony bought Minolta's SLR business in the 2005 ish. Minolta had only produced 2 Digital SLRs (confusingly called the 5D and 7D) by then, but had made countless film SLRs and Lenses.
Sony brought out their first DSLR the Alpha 100 which was very similar to Minolta's 5D and 7D with the A-mount that Minolta had invented. So all existing Minolta users could simply take their Minolta A-mount lenses and fit them onto the new Sony cameras.
In 2010 Sony stopped making DSLR cameras with a moving mirror for the view finder and started using the SLT system with an electronic view finder. Hence the DSLT models.
In 2010 Sony brought out the NEX series of compact system cameras with the E-Mount lenses. This is a crop sensor, but you could get an adaptor to use A-Mount lenses on the E-mount.
In 2013 Sony released the a7 series of full frame E-Mount cameras. So now they were producing full frame and crop frame cameras and lenses for both E-mount and A-mount.
Also of note: Up until 2012 Sony Alpha DSLRs and DSLT cameras used the old Minolta-style flash hotshoe. After this point, Sony introduced a more standard hotshoe, so you no longer have to use Sony-specific flashes and triggers (unless you want TTL).
Types of Sony camera and their mounts:
Sony DSLR a100 (crop sensor) to a950 (full frame) - A-mount
Sony DSLT a33/55/77 (crop sensor) to a99 (full frame) - A-mount
Sony NEX3/5/7/9 to a5000/a6300 (crop sensor) - E-mount (crop)
Sony a7/a7II/a7R/a7R2 (full frame) - E-mount (full frame)
If you are thinking about secondhand lenses at all, do check out the
Dyxum website. When browsing ebay if you find lenses which say Minolta AF on them, they are full frame and will fit your a77. Anything labelled Minolta or Sony A-mount will fit your camera.
Have fun.