Useless Information (?)

Image here was made by a Tri-color Pinhole which I could mount on

the A7 camera through Nikon to EOS and EOS to E-mount adapter. 

(What a hustle ! = I’ll tell you later.)

During all those hustle, what I found were — (though they may not

necessary useful to you.)    😀

1)  You can use Pentax-K lens cap on Nikon lens. (Photo Left) 

2)  Likewise, the same Pentax-K  lens cap will fit to the Sony

E-mount lens. (Photo Middle) 

3)  Sony E-mount body cap will fit to the Nikon body. (Photo Right)

4)  The adapter, EOS to E mount I got from Ebay (about £5 or so) had

a trouble — as bayonet spring was too wide and obstructing the lens

bottom goes into = I needed to file-down the width of those 3 springs

(where I marked in Red on the photo Right = see enlarged) 

(Photo shows the bayonet spring and a broken hence replaced screw)

= If you found the same trouble, you need to do the same — or buy

another, more expensive one. (So, they changed the price to £7.xx) 😀

(Think, why it was cheap = being defective, it became a deadstock and

sold as a scrap.   Then, Chinese guy made a Net business to sell away

= how many customers sending back and claim a money back which

would cost more, and the address may not even existed.)   😀

The funny story was, as I put negative feedback on ebay, the seller

contacted me saying if I change the feedback to positive,they will

refund me, so I replied them “As this blog explained, I’ve modified

its defect and now I’m using it, therefore no need of refund, still,

the fact remain I wouldn’t change the negative feedback” —

then, they send me yet another mail

“We will send you £2,  so change the feed back to positive” =

Are they thinking that they can buy me £2 ! = What a mentality !

Is this a norm in China ?   horrifying isn’t it ! 

To see the situation, I gave a through check of those adapters.

(To be fair, I obtained even one more EOS-NEX adapter)

In order to make a bayonet fixing tight enough= not clutter,

still smooth enough to dismount, the spring was used beneath

the craw (such as the one I’ve shown few picture before with

red mark), other cheaper alternative is to make a slit in the

claw (Photo above Left = yellow marked) and make the slit

bend to give some flexibility.    Though, the other EOS-NEX

adapter showed funny character = Canon’s EFS (plastic mount)

could be mounted but metal mount thousand pound lens couldn’t. 

Because the adapter’s female claw was too thick.  ==> I needed

to file down the claws thinner. (Photo Right — with blue color

marker =  it’s easy to see where I do need to cut !)

(It’s funny to discover, that the Canon is making their

cheap EFS lens mount even thinner and loose.)

5)  Nikon G to EOS adapter sold on the Net, the rotating lever may be

too long and stack with the lens bottom.  So that, if you found the sign

of such symptom, DON’T mount the lens to EOS with such adapter.  

You need to file-down the tip of the lever (marked in Red in the

photo above) a bit shorter, and make sure the lever moves freely.

So, — after I’ve sorted out those troubles, I could mount my

Tri-color Pinhole (here, Pink, Yellow, Sky)  to the A7 body.

( Then after thought, I should make another one for A7, since an

Olympus body cap which is fit to A7 is  £0.99 and etc is free, but

the use of those adapter which is costing £5, £10 makes no sense.)

And, this was the photo of, now rather familiar view — by

the Zeiss Distagon 18mm, designed for Nikon mount.

—– A nightmare of the mount adapter IS = once the lens stack

to the body, there is no way else other than to destroy the lens.

(Pull-off the screws, fixed to the mount with sheer force or hack-saw 

the lens bottom while showering the camera with saw dust.)

Is it funny ?

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PS :  If you are looking for the Body Cap for Sony NEX mount to use

for a Pinhole experiment etc. or just for body cover, now in the Ebay

you can find the pair of E-mount (NEX) Rear Lens Cap + Body Cap

for £0.99 —– you don’t need to hastle finding out OM cap.   🙂

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Wide-angle Pinhole Photo

 In the previous post, I’ve shown you ultra-wide or Semi-fisheye “Diopt-Pinhole

Hybrid Photos” which mean, it used not only pinhole but combined with an

optical lens too. —– The photos here shows you how the device looks like.  

In fact it was a very simple device = Double-density Pinhole was mounted back of

an EOS mount-adapter and a pretty heavy concave lens was mounted on its front.

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If anybody try to do a pinhole photo on a SLR camera, (still, it could be done in

all sorts of the way such as a “Photo-sensitive emulsion was painted on a panel

which was placed inside of a huge Shipping container box and a small pinhole was

made opposite wall = Transportable [Camera Obscura] ) in most of the case,

people places a pinhole panel on the camera front where the lens was removed

and obtained fuzzy image of about standard lens. (If a camera used was Full-frame

DSLR, it would be equivalent 45~50mm lens but with APS size, it would be about

85mm lens image).

Because, such as Canon EOS camera has 44mm flange-back (distance from lens

mount to image-sensor) and the diagonal size of 36x24mm frame was 43.26mm

=> If you draw a Triangle 43.26mm wide, and 44mm high, you will get a spread

of the top-angle 54 degrees.

The shorter the hight of triangle, the wider the spread though, you can’t place a

Pinhole panel closer than 37mm (7mm inside of the Camera) otherwise it

obstructs (or damages) the mirror.   This limitation lead me to resort with an

optical glass to obtain wider view in the pinhole photography.

So, the inside of the device, you can see blue panel of a beer-can (Photo Center)

and the Double-density pinhole of which the outer hole was 1.5mm and the

center hole was about 0.15~0.2mm. (Photo Right).

After a field test, where I found hopeless Halation in this optics, I realized that

I need to give an Anti-reflection covering to the shiny beer-can. 😀

—– (The photos above shows the comparison = with or without Concave lens.

—– Note : Pinhole Photo has NO distortion or any optical aberrations

—– = Since it is not Optics NOR bends the light. (Save a Diffraction. ) 

— (Being Pinhole, there is NO focus or Depth of Field = Fun to make a Close-up !)

It needs further refinement still, at least, I got pretty wide “Pinhole Photo” view.

—– whether it was worthwhile or meaningful was arguable though, it was

what I wanted. (with fun ! )  😀

By the way, the lens I’ve used was cannibalised from a “Fisheye adapter lens”

widely available in the net.  (about £10~£15 but quality is what we paid

= I mean Don’t expect too much.  —– this is a Fun Project.  😀 )   

And about the lens mount-adapter, I’ll talk about it in the next post.

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