Cosina 24mm f/2.8 Macro lens
Oct 27, 2015 19:30:10 #
Bear with me please, macro is a new area for me. I bought the above lens on eBay. First thing I noticed was that the aperture ring moved smoothly: no "click" feeling. Put it on my D7100 set to manual and it was like the aperture ring was spring loaded. It returned to f/2.8, and I had to hold it to a different aperture. So I thought "that was a waste" not worth returning.
So today I put it on a D5100, and the ring remained loose, so I could set the aperture. Weird? Or am I missing something really basic?
So today I put it on a D5100, and the ring remained loose, so I could set the aperture. Weird? Or am I missing something really basic?
Oct 27, 2015 19:39:41 #
does it have a pin that needs to be activated by the camera?
see: http://www.pentaxforums.com/userreviews/cosina-24mm-f-2-8-mc-macro.html
see: http://www.pentaxforums.com/userreviews/cosina-24mm-f-2-8-mc-macro.html
Oct 27, 2015 19:48:29 #
oldtigger wrote:
Hi Oldtigger:I looked for a pin or equivalent, but didn't see one. There is a tab on the mount that won't move, and one screw that seems a little raised. I'm happy that it's usable with the 5100. Thanks for review, I'm pleased with the rating. And thanks for the response.does it have a pin that needs to be activated by the camera? see: http://www.pentaxforums.com/userreviews/cosina-24mm-f-2-8-mc-macro.html
Oct 28, 2015 09:00:47 #
24mm puts you right on top of your subject. I suspect that this isn't a true flat field macro lens, but just a close focusing lens. I've never heard of the brand thus I suspect it was made by an older 3rd party vendor & simply branded with that name. Some people remove the detent ball in order to use a lens when doing video. On a D5100, the aperture is controlled by the camera butt if there is no "detent", i suspect it may not give you a correct exposure. Did you try taking images with it ?. Were they properly exposed ?
Oct 28, 2015 14:47:57 #
Screamin Scott wrote:
24mm puts you right on top of your subject. I susp... (show quote)
Hi Scott:
it won't let me set aperture in camera. It just says "no lens detected"; however, I can set it on the lens.... it's just loose. Exposure is OK in manual mode. Yes, I do believe it is an older lens. It's branded "Cosina", not as my bad typing previously described it.
Oct 28, 2015 21:00:23 #
Murray wrote:
Bear with me please, macro is a new area for me. ... (show quote)
Kinda sounds like you may have a lens that's set up for video.
Oct 28, 2015 21:22:36 #
naturepics43 wrote:
Kinda sounds like you may have a lens that's set up for video.
Apparently... Oh well, it does work.
Oct 29, 2015 09:38:56 #
some old lenses you have to have the aperature set all the way closed if i remember right
Oct 29, 2015 15:35:58 #
tinusbum wrote:
True, but there's no lock on this one, and even when I close it down, the camera "doesn't recognize it" so I can't use aperture setting in camera.some old lenses you have to have the aperature set all the way closed if i remember right
Oct 31, 2015 12:54:00 #
FWIW:
The Cosina 24mm f/2.8 was manufactured in the mid-80s by Cosina, and sold under various brand names: Cosina, Vivitar, Exacta, et al. As Scott wrote, it's not really a macro lens, but it focuses really close for a wide angle.
The Cosina 24mm f/2.8 was manufactured in the mid-80s by Cosina, and sold under various brand names: Cosina, Vivitar, Exacta, et al. As Scott wrote, it's not really a macro lens, but it focuses really close for a wide angle.
Oct 31, 2015 22:56:51 #
LoneRangeFinder wrote:
Brassy bunch they were printing the word "macro" and 1:1 on the thing.The Cosina 24mm f/2.8 was manufactured in the mid-80s by Cosina, and sold under various brand names: Cosina, Vivitar, Exacta, et al. As Scott wrote, it's not really a macro lens, but it focuses really close for a wide angle.
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