I have a number of different Vivitar 135mm lenses. The plain 135/2.8 Fixed mount Ser. 28XXX... is a very good performer. The 135/2.8 Close Focusing is an excellent lens and focuses to 1:2. The 135/3.5 Fixed mount Ser. 37XXX... is a decent lens if not as good as the 135/2.8 Fixed mount. The 135/2.3 Series 1 is very nice and focuses to 1 meter. It' heavy. There were f/2.8 and f/3.5 T4 lenses Ser. 37XXX... which are adequate if in good condition. There were f/2.5 and f/2.8 TX series lenses Ser. 37XXX.... Both are good. The f/2.8 lens is quite compact. The later Ser. 9XXX... lenses work but I can't vouch for their sharpness. I have a number of Minolta Rokkor and Celtic lenses which are all godd and which are also not too expensive. Any of the Vivitars I have listed would be fine for $19 if in good condition.