The 50/100 brightlines are always visible. Not a nice a an M, but still very usable.
It should be noted that the YF's projected parallax corrected brightlines were quite a feat for the time. Only one Nikon rangefinder has them, the SP. Canon rangefinders did not have them until the Canon 7 and 7s. The original Contax series never had them. I believe the YF holds the distinction of being the least expensive Leica screw mount camera to have this expensive and complicated piece of viewfinder engineering.
There are two separate shutter speed dials for high and low speeds, like the knob wind Leicas. While you have to be careful and not have your finger touch the rotating high speed dial during exposure, the advantage is that multiple exposures are VERY easy.All you have to do is rotate the high speed dial counter clockwise until it locks, and you are ready for another exposure on the same frame. The top deck shutter speed dial is 1/1000th to 1/60, with the 1/30th to 1 second range on the front dial. Flash sync is at 1/30th. Flash Sync is offered in a simple PC connection, without the complicated flash settings of the contemporary Leica IIIf and IIIg. Alas, there is no hot shoe. The film counter is manually reset, like its contemporary the Leica M2. Well, what did you expect? It has an unusual, butergonomically well designed, film advance lever, and a hinged back door thatallows easier film loading. Another feature that makes Yashica YF a great usercamera is its viewfinder. It's quite large and bright, and it hasparallax-corrected, orange-coloured framelines for 50mm and 100mm lenses. Theentire area of the viewfinder has a 35mm view. The rangefinder is built intothe viewfinder. 450001 - 49xxxx (not continuous) 1. 1, 2, 4, 8, 15, 30 on the slow shutter speed selection dial B, 30-X, 60, 125, 250, 500, 1000 on the main shutter speed selection dial (rotating). Built-in rangefinder 50mm and 100mm parallax-corrected framelines displayed simultaneously The full viewfinder has 35mm view. Rangefinder base length: 48mm 1. Provided for X (synchronization speed is 1/30 s) 1 and for FP at all speeds. Body only: 139mm x 80mm x 46mm The width of the top plate is 34mm; the 139mm length measurement doesn't include the strap lugs. The item "Vintage Yashika YF Camera with Original Leather Case" is in sale since Wednesday, August 8, 2018. This item is in the category "Cameras & Photography\Vintage Photography\Vintage Cameras\Other Vintage Cameras". The seller is "nicolascottvoice" and is located in London. This item can't be shipped, the buyer must pick up the item.