M8 with 40mm lens / framelines.

[_larky]

Hello.

LEts say you have an M8, with a 40mm on the front of it. This is roughly 53mm, so will the M8 choose the 50mm lines or did they not think about crop factor when building it?

 

[efix]

It's the other way round. They did think of the crop factor, so the 50mm framelines come up with 50mm lenses, but show the field-of-view of a hypothetical 67mm lens.

Most 40mm lenses activate the 50mm framelines on M bodies. The bayonet (of the lens) can be modified, though, to bring up the 35mm framelines.

 

[randomm]

Slightly off topic:

I did a test today on my M6 and Rokkor f2 40mm lens, and it appears that at longer distances the 35mm framelines are a perfect match for the lens. At closer distances I'd say you get about 97-98% of what the framelines show.

So if this is anything to go by, do the modification yourself and live with the "35mm" lines on your M8. If you need instructions for the modification, PM me.

 

[_larky]

So, I'm confused I've been reading through a load of stuff online, and I've found the modification you speak of. But, the crop factor would make the 40mm lens a 53mm lens yes? So, I assume even though it acts as a 53mm lens you want the 35mm frame because that in fact is acting as a 46.5mm frame?

So, on the M8 it brings up the 50 for a 50 lens but in reality it's showing for a 67?

I need a beer

 

[randomm]

So, I'm confused I've been reading through a load of stuff online, and I've found the modification you speak of. But, the crop factor would make the 40mm lens a 53mm lens yes? So, I assume even though it acts as a 53mm lens you want the 35mm frame because that in fact is acting as a 46.5mm frame?

So, on the M8 it brings up the 50 for a 50 lens but in reality it's showing for a 67?

I need a beer

No. On M8 it should bring up the same lines as a 50mm lens would. Crop factor means that a 50mm lens looks like a 67mm lens would on a full frame sensor. You can live without modification, but that means that you'll be getting plenty more around the edges.

I'm very very happy with my test as the Rokkor is probably my sharpest lens, and now I don't have to guess with the M6 anymore

 

[efix]

So, I'm confused I've been reading through a load of stuff online, and I've found the modification you speak of. But, the crop factor would make the 40mm lens a 53mm lens yes? So, I assume even though it acts as a 53mm lens you want the 35mm frame because that in fact is acting as a 46.5mm frame?

So, on the M8 it brings up the 50 for a 50 lens but in reality it's showing for a 67?

I need a beer

Okay, forget about crop factor. Look at it this way: A 40mm lens brings up 50mm framelines by default. But since 35mm framelines show a frame closer to what a 40mm lens records, many people modify their 40mm lenses to bring up 35mm framelines.

With 35mm framelines, you see a bit more that what you get, but the ratio is much more favourable than with 50mm framelines, where you see a lot less then what you will get.

Now introducing crop factor again: Multiply the focal length indication by 1.33, and you get the focal length equivalent for a full-frame system that gives the same field-of-view as your factual focal length will give on the M8.

(Note: the term "50mm framelines" does not mean a frameline that shows the field-of-view for a 50mm lens on full-frame [it just does so on an analog M or M9 coincidentally], but means the framelines that come up with a 50mm lens and show the corresponding field-of-view that lens will get you on your camera.)

 

[_larky]

OK, makes perfect sense. So I'd need to buy a file

 

[nicehugoboss]

yeah. file it. u will more happy with Frameline.
i have one 40mm before. haha very sharp

but didn't file the bayonet. scare to affect the selling price.
hehe

Enjoy.

but recently did the file on one LTM-> M adapter( china made , cheap one)
file to correct Frameline for my lens. . Feel happy after made it!
Get the Job Done!

finally go for Voigtlander adapter..... for comfortable feeling haha

XD