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Showing results for tags 'diopter'.
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Hey all! Looking to buy (or rent!) a split field diopter (ideally 138mm, but willing to look at any that would work with zeiss super speed set so anything that would cover 80mm works)! Located in the Chicagoland area, so if anyone has any leads on local rental houses that would have this item by February 14th, that'd be awesome! Thanks!
Hi community, I have two questions related to poor-man's macro solutions. I am about to purchase a Krasnogorsk K3 and look for ways to shoot in macro with it. One idea was to just put a diopter - these close-up rings - in front of the lens. I know it's a super cheap solution, but that's how I roll. Does anybody have any experiences in that regard? At a later stage I'd buy a macro lens for it. I know it has a Pentax mount, so am I assuming correctly that I can just use any fitting macro lens with that mount then? Thanks for helping me out! Manuel
Hi guys, when shooting with diopters the other day I noticed that you can actually not focus objects in a distance, only close and middle range distances. What is the proper mathematical/physical explanation for this? I know that diopters bring the close focus "closer" but why can't one focus throughout until infinity? And is there a way to determine the "maximium focus" (opposite of close focus) ? Let's say you're shooting with an ALEXA 16:9 2K with a 50mm f2.8 and a diopter 1.....apparently close focus will be 1m but can I predict the "maximal" focus? Would be handy to know. And does it change according to lens, format, f stop? If a diopter 1 brings the close focus to 1m - does that apply to any focal lenght? Hard to believe... Thanx for your input :) M
The focus adjustment ring on my bolex h16 reflex camera is stuck. I have tried focusing the ground glass with the lenses removed and the camera pointed at a bright light source. The ring will move a little bit and I can see the ground glass blurring and sharpening, but I do not have full movement of the ring. I tried losening the screw on the focus ring and re-tightening it, and it still will not budge. It feels as if it is catching on something, I can hear a little clicking noise when I try to turn it. I am thinking that I may need to take apart the diopter to find out what is jamming it up internally. I can't figure out how to do this- apart from tightening and loosening the screw on the focus ring. If it is possible, I would like to try to repair this by myself. Any suggestions?