Working out exposure times for pinhole hybrid

[xkaes]

WHAT? We don't have a sub-FORUM for the f64 GROUP?

 

[kristelt]

WHAT? We don't have a sub-FORUM for the f64 GROUP?

This is a great link thanks . Kind of why I switched to a lens..to enjoy the sharper focus + built in shutter.

 

[kristelt]

Understanding Exposure, Part 1: The Exposure Triangle

Photography is all about capturing light. In fact, the etymology of the word “photograph” is basically “light drawing.” To make a photograph that we can see, we have to control both the amount of light that is exposed to a photosensitive surface, be it film or a digital sensor, and also control...

www.bhphotovideo.com

Thankyou

 

[xkaes]

This is a great link thanks . Kind of why I switched to a lens..to enjoy the sharper focus + built in shutter.

Uhhh, before you wet your pants, you ought to read up on DIFFRACTION.

 

[grain elevator]

Uhhh, before you wet your pants, you ought to read up on DIFFRACTION.

This, in addition to being rude, makes no sense in this context. Any lens at any aperture possible will have less issues with diffraction than a pinhole. And given the issues the OP is currently facing, worrying about diffraction is far, far down the list.

 

[xkaes]

It makes perfect sense to me, anyway.

Whether a person is using a pinhole or a lens at f64+ they should know about diffraction -- and what it does to the quality of the image. Otherwise they might be sorely disappointed. Since the OP appears to have no experience in this realm, it makes sense -- to me, anyway -- that it should be understood.

I usually don't jump into a lake without having a good idea of the water temperature. And I don't consider the advise of "look before you leap" to be "rude". I view it as being "considerate".

 

[BradS]

It makes perfect sense to me, anyway.

Whether a person is using a pinhole or a lens at f64+ they should know about diffraction

Check your assumptions.
The OP repeatedly says f/16...

 

[xkaes]

Check your assumptions.
The OP repeatedly says f/16...

Apparently the moderator has the same "assumption".


{Moderator's edit: readers of this thread may find it useful to know that it appears to be in reference to a lens camera using an extremely small aperture, rather than a classically defined "pinhole"|


f16 is not an extremely small aperture.

 

[BradS]

f16 is not an extremely small aperture.

Obviously.

This whole thread is a confused mess.

 

[xkaes]

This whole thread is a confused mess.

My guess is "diffraction".

 

[BradS]

My guess is "diffraction".

I blame the fish people.

 

[BradS]

...but seriously, I think the root cause of many respondents' confusion, including the moderator's, is directly attributable to the phrase, "hybrid pinhole" and the YouTube influencer that made up this nonsense. A glass lens is not a pinhole...and using a hand made aperture does not make it a pinhole. Its just a lens with a hand made aperture. The example in the YouTube influencer's video isn't even "an extremely small aperture" (150mm / 30mm = f/50). This is the kind of crap we have to deal with today - a YouTube influencer makes up bullshit and it is taken as fact. "I saw it on the internet so it must be true".

It seems like to OP's real issue is determining a useful film speed for paper negatives....It has absolutely nothing to do with the specific camera used.

...and reciprocity failure should probably be the next topic of study/discussion

 

[nmp]

Mea culpa!

I apologize for bringing in the youtube video in the discussion. I truly thought OP had a pinhole tucked away in the light path in addition to the glass. It's a lesson, and I have seen this far too many times, that before we go on answering what we think OP has asked, first thing to do is to ask them to clarify and go further only that has been done. In this case OP had an opportunity several times to disavow the term "pinhole" but didn't do so until all hell broke loose.

:Niranjan.

 

[kristelt]

This, in addition to being rude, makes no sense in this context. Any lens at any aperture possible will have less issues with diffraction than a pinhole. And given the issues the OP is currently facing, worrying about diffraction is far, far down the list.

Uhhh, before you wet your pants, you ought to read up on DIFFRACTION.

I know about diffraction thanks. We are each trying to find our own way of working, which me for me involves learning about all different ideas. Ive met some very polite and helpful on here who have sent me useful links and Im grateful.