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Paul Kay

Member Since 27 Nov 2003
Offline Last Active Today, 12:41 AM

Posts I've Made

In Topic: Rolleimarin Info wanted

27 February 2015 - 01:52 AM

Thanks for all the info. The 'interface units' are missing, BUT.....


Having had a really good look at this housing I am now of the opinion that it has actually never been used! I still can't open it as the main seal is well stuck down due, I suspect, to it having been unopened for many years - it needs easing and will eventually open I'm sure. Condition though is fabulous - it is immaculate and very close to being in 'mint' condition. Which leaves me in a bit of a quandry. If it had been used I might just have modified a cheap TLR to get it running, but its in 'collectable' condition and to use it would inevitably change this. So I suspect that I will sell it on - it really deserves to be appreciated as a piece of history in its current condition rather than anything else - even though I think equipment should be used really. In a way its a pity but I'm not a collector but rather a user. And FWIW its and early housing I think - it not to hand to quote the s/n but sound early.

In Topic: Canon 5dS and 5DR

11 February 2015 - 04:43 AM

Am curiois as to when the resolving power of the L series lenses is impacted/overcome by pixel density.

It is and isn't! More sampling (pixels) will provide more data which may be tonal or resolution. The interaction between the lens and pixel density is complex and you will find numerous internet discussions, arguments and a great deal of misinformation and lack of knowledge stated in defence of various apparently strongly held views.


I suspect that we already have cameras and lenses capable of results beyond those needed for the vast majority of images which are taken. When needed, today's highest MPixel cameras and 'best' lenses are extraordinarily capable - if used appropriately. 50MPixel cameras will no doubt yield measurably 'better' images, but whether the images will be obviously, visually better or simply marginally better will be an interesting question. For myself I see little point in going much beyond 25MPixels simply because I don't need to for the vast majority of images I take. [Its a bit like driving a car capable of higher speeds than legal and/or roads allow. An interesting talking point, but unless you are going to race them on a track, somewhat irrelevant in general usage terms.]

In Topic: Canon 5dS and 5DR

10 February 2015 - 03:06 AM

I find that 'clarity of detail' on the 5D2 maximises at between f/11 and f/16 using the 100mm macro lens at 1:1. I find that f/16 starts to show a very marginal softening (although in the 'real world' images are still perfectly usable). As Alex shows smaller apertures show significant softening and super-macro will gain little from more MPixels. As a guesstimate, I'd suggest that 50MPixels on Full Frame will show a wider 'optimum aperture' for 'clarity of detail' of f/8 to f/11 even at 1:1 so the balance of depth of field versus detailed information will change and gains in detail will be offset by reduced depth of field. Until someone comes up with a fast auto-stacking camera we are at a bit of an impasse already IMO.

In Topic: Mold in Nikon 105 vr please help

06 February 2015 - 04:18 AM

If you are desperate try this: UV kills fungus so leaving the lens pointing towards the sun so that it gets a thorough dose of UV through it (be aware that the glass in some lenses does not transmit UV well and remove any skylight or UV filters obviously. This might help stop the fungus getting any worse and causing coating/glass surface damage, but you may need to be careful not to overheat the lens and cause any damage. Then it needs to be kept dry - use a desiccant such as silica gel and keep it with the lens in a plastic bag. Contrary to popular belief, fungus or mold does not spread unless it has the right conditions to do so - so keeping equipment dry (and in the light) is far better than storing it in damp or humid (and dark) conditions and should prevent the spread of fungus or mold. Personally I wouldn't keep a lens with fungus with unaffected lenses simply because it is a source of fungal spores which may affect other lenses if they are then subjected to damp or humid condition in which the spores can then cause fungal or mold infection. But if you can stop the fungus by changing the conditions that the equipment is kept in, it shouldn't spread.

In Topic: Rolleimarin Info wanted

06 February 2015 - 03:12 AM

Hi Steve


Here's a very quick 'snap' - nowhere to take pix here at the moment as we have builders in!


Attached File  Rolleimarin.jpg   158.64KB   5 downloads