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Author Topic: pentax 110 slr lenses on the ep-1  (Read 5107 times)

Offline barondla

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Re: pentax 110 slr lenses on the ep-1
« Reply #75 on: July 29, 2010, 07:33:58 PM »
 Hard to believe that Pentax lenses will cover the larger APS c format. Thats a fair bit more coverage. Will be interested in seeing some results.
 Also a little surprised that the Nex has a shorter registration distance vs the Pen.
thanks
barondla

Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #76 on: July 29, 2010, 09:10:32 PM »
the 110s will vignette on the nex i believe , the 110 film rectangle and the m4\3 sensor are very close in size , but the nex is aps-c, no?

Offline voyager

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Re: pentax 110 slr lenses on the ep-1
« Reply #77 on: July 30, 2010, 01:44:26 AM »
the 110s will vignette on the nex i believe , the 110 film rectangle and the m4\3 sensor are very close in size , but the nex is aps-c, no?


Yes. In many ways the larger sensor size is a disadvantage because you can't use as many lenses without having any ill effects.
Have you used your E-P1 lately?

Online travfar

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Re: pentax 110 slr lenses on the ep-1
« Reply #78 on: July 30, 2010, 05:53:29 PM »
My caps are here!!!!!  My caps are here!!!!!

Let the adapter building madness begin!!!!!

Any tips?

Offline voyager

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Re: pentax 110 slr lenses on the ep-1
« Reply #79 on: July 30, 2010, 06:18:12 PM »
My caps are here!!!!!  My caps are here!!!!!

Let the adapter building madness begin!!!!!

Any tips?


Yeah, post some photos of your process. :-P
Have you used your E-P1 lately?

Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #80 on: July 30, 2010, 08:17:33 PM »
set the lenses to infinity
use a tripod..... prepare the caps by carefully identifying the center and drilling out enough to allow the lens with lens cap to fit snugly in the hole in the body cap.
[ cut the center out of the rear lens cap to allow an optical path!] 

the idea is to move the lens with rear lens cap mounted to the point where
a distant object will be at its sharpest with the lens focused to infinity , play around here and make a decision whether you want the lens to rack all the way at infinity or instead go past infinity so you can critical focus adjust at infinity , this is a personal decision

when it seems at the correct point look around the perimeter ..see it it at an equal depth all around a test shot with a check for a soft corner or side is advisable.... if it correct and if its snug , carefully remove  the lens and cap together and put a drop of cyanoacrylic[ crazy type ] glue at alt least 3 points to fix the distance now you will probab;y have light leasks

use a 2 part plumbers epoxy putty it usually dark grey of black flat when cured use a quick set type roll the two parts togwether well to mix and put a ribbon around the inside of the lens cap where the rear lens cap meets the bodyt cap to stop any light leaks do this carefullyh and neatly to avoid messing up any optical surfaces and alway know where your sensor is at all times and keep it away from glues and plumbers seals   

when its all dry put a small piece of dark paper in the space between the lens mounting surface and the lens cap so that it will be extra snug , other wise the lens could slowly loosen and fall off when you least expect it , or you  could glue the lens in with a spot of elmers glue which is reversible with a drop of water or vinegar

Online travfar

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Re: pentax 110 slr lenses on the ep-1
« Reply #81 on: August 12, 2010, 05:32:30 PM »
Picked up another Pentax 110 with a couple of lenses.  $2.  How could I pass it up?

Offline voyager

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Re: pentax 110 slr lenses on the ep-1
« Reply #82 on: August 12, 2010, 06:12:27 PM »
Good thing they're small or else you might have ran into a storage problem by now.
Have you used your E-P1 lately?

Online travfar

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Re: pentax 110 slr lenses on the ep-1
« Reply #83 on: August 12, 2010, 06:16:45 PM »
I really really really love the Pentax 110 lenses.  They are outstanding.  If only there was an aperature.  I'm thinking about maybe seeing about ripping the aperature off a computar but I'm concerned it would be two far away from the rear lens and vignette.  The other option is to tape on aperatures permanently on the rear of the lenses.  I have 5 or 6 of the 24s.  I'll just carry one wide open and one with a smaller aperature.  This is the most cost effective solution.

Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #84 on: August 12, 2010, 08:27:02 PM »
they are all good even the 20-40 2.8 isnt bad, the 70 is nice too

i especially like the 18

Offline Antoine G

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Re: pentax 110 slr lenses on the ep-1
« Reply #85 on: August 13, 2010, 04:01:36 AM »
Quote
i especially like the 18

I just have bought the regular 18mm and the Pan Focus one (not arrived yet), i agree it's the loved one. The OVF for the 17mm can be used, i found even that it cover less with its frame dedicated to this range than the 18mm does really. Distortion on close objects lines are evident, but it can be corrected in post process.

Two things i just noticed :
The use of the sunshade and a filter combined produced a light vignetting, then i have too the W21 close-up filter and it's a pure joy to work with, despite the own of a Minolta 50mm macro, this lens is going to be stuck on my body as the first lens.

I'm looking to buy a manual focussing lens actually about 17mm range, and i'm still wondering beetwen the Minolta, the Canon (17 or 19), the Olympus (too expensive generally) and the Belomo that looks original.

« Last Edit: August 13, 2010, 04:03:31 AM by Antoine G »

Offline adash

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Re: pentax 110 slr lenses on the ep-1
« Reply #86 on: August 13, 2010, 04:04:23 AM »
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Belomo that looks original.

Which Belomo?
Congrats on your purchase!

Offline Antoine G

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Re: pentax 110 slr lenses on the ep-1
« Reply #87 on: August 13, 2010, 04:17:25 AM »
The Belomo 17mm here in the Fish List
« Last Edit: August 13, 2010, 04:31:31 AM by Antoine G »

Offline adash

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Re: pentax 110 slr lenses on the ep-1
« Reply #88 on: August 13, 2010, 02:13:45 PM »
The Belomo 17mm here in the Fish List


That's going to be an overkill! Raise the money for the pancake!

Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #89 on: August 13, 2010, 05:31:25 PM »
the fish list is great it should have a dedicated thread in adapted lenses so folks luckyt enough to have one on these on a m4\3 camera can post a pic showing angle of view[ with a 14mm kit zoom shot for comparison]


thats a great resource the fish list .... anyone got the peleng or zenitar would help me alot to start a thread with comparison angle of view shots and a critique of the lens quality and corner sharpness etc

Offline Antoine G

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Re: pentax 110 slr lenses on the ep-1
« Reply #90 on: August 14, 2010, 12:58:05 AM »
Another Fish List very important...

Offline adash

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Re: pentax 110 slr lenses on the ep-1
« Reply #91 on: August 14, 2010, 01:44:59 AM »
Quote
Another Fish List very important...

 8)

Quote
the fish list is great it should have a dedicated thread in adapted lenses so folks luckyt enough to have one on these on a m4\3 camera can post a pic showing angle of view[ with a 14mm kit zoom shot for comparison]

All the fisheye lenses for film cameras are a waste of money and unnecessary weight to carry around, except the shortest focal lengths, like 6-8mm, which act as full-frame fisheyes (circular on film, non-circular on m4/3). If you attach a 16mm full frame fisheye for film, on m4/3 you will get a basically unusable distorted wide-angle, not even wider than the kit zoom! It is a good experiment, but you will find the m4/3 pancakes much more usable at the end of the day.
There is a 4.5mm fisheye by sigma, designed specially for cropped sensors, which might be a better choice, but still very expensive.

Offline Antoine G

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Re: pentax 110 slr lenses on the ep-1
« Reply #92 on: August 15, 2010, 09:51:11 PM »
So i got the Minolta one for a regular price (as i'm full equiped with that brand always underestimated) and i will check if it's unusable, for sure it's not a pancake, but allways a good value to resell.
Minolta  MD W. Rokkor 17mm ƒ4

Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #93 on: August 16, 2010, 04:33:28 AM »
so a 180 degree fov full frame lens isnt wider than the kit zoom  on m4\3?

are you sure

Offline adash

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Re: pentax 110 slr lenses on the ep-1
« Reply #94 on: August 16, 2010, 05:36:40 AM »
so a 180 degree fov full frame lens isnt wider than the kit zoom  on m4\3?

are you sure


Basically a full frame fish eye with a 180 deg. diagonal will see slightly more, as the barrel distortion extends the view angle in the diagonal, but restricts it in the horisontal and vertical directions.
This is an image (from mir.com.my/rb) that shows what a 180deg. FF fisheye does on film.



Now try to imagine, or just crop the image to the m4/3 frame size. The diagonal view angle will be approximately 90deg., at the expense of a strongly distorted image.


Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #95 on: August 16, 2010, 06:26:19 AM »
i imagined more....... but i see your point

so what fov equiv would thge pengyang 8mm give [ in 35 mm terms]

Offline adash

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Re: pentax 110 slr lenses on the ep-1
« Reply #96 on: August 16, 2010, 07:22:30 AM »
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i imagined more....... but i see your point

It is more - it is 90deg diagonally against 75deg. for the kit zoom. But that's across the diagonal only.

Quote
so what fov equiv would thge pengyang 8mm give [ in 35 mm terms]

I would bet for about 16mm on film. It also depends on the ammount of distortion the particular fisheye has. I don't know what that pengyang 8mm is, but you could search the internet for it and find a picture on 35mm film that was made with it. Cropping the central part is a good way to predict what you will see on (m)4/3. The exact angle of view is more difficult to predict.

Offline cosinaphile

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Re: pentax 110 slr lenses on the ep-1
« Reply #97 on: August 16, 2010, 09:15:27 PM »
thanks adash,,,,, im thinking about the pengyang :)


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