H4D-50 crop factors

[ghoonk]

Guys, I'm having a discussion with an LF shooter and we were discussing the H4D-50 and a 35mm HC. I'm saying that the 35 would have a field of view like a 38.5 due to the 1.1x crop factor of the 50MP back.

He's saying that since the sensor is bigger than 24x36mm, so same focal length does not give same FoV.

What's the correct answer?

[NickT]

38.5mm on a 645 which would be the equivalent of a 23.45 lens in 35mm terms.

*I think*

Nick-T

[GeorgeTelis]

The 35mm on a full frame 645 has an equivalent of 22mm on a 135mm camera but as we know there are no full frame  digital backs on the market so the digital medium format equivalents (135mm) are:
23mm for the H4D 60
25mm for the H4D 50
27mm for the H4D 31
and 27.5 for the H4D 40

and for Medium format 645:

36mm for the H4D 60 (maybe under a mm difference on this sensor)
39mm for the H4D 50 so 38.5 could be correct
42mm for the H4D 31 and
43mm for the H4D 40

If we want to be so accurate though we have to take into consideration the fact that the HC 35mm is 35.8mm in practice.
http://www.hasselblad.com/media/1f9ad1ce-5a29-49cc-97c5-244a70f5d446-HC35.pdf

I hope this information was helpful 

G.telis

[NickT]

george sounds like he knows what he's talking about I was close...

[ghoonk]

Sorry, you lost me there. I always had the impression that the 35mm lens on the H4D-40 (x1.3 crop) would give me the equivalent of a 28mm lens on a 35mm film camera. Likewise, the 28/4 HCD would deliver a similar field of view as a 24mm lens on a 35mm format when used with a medium format sensor with 1.3x crop factor.

if the 35/3.5 lens on the H1 shoots like a 22mm on the 35mm format, you're saying that it would shoot like a 28mm on the H4D-40 (i'm rounding for the sake of keeping this simple) - a 0.8x multiplier

But you go on to add that it would be a 43mm for the H4D-40.

I'm confused. Which is it? 35mm on the H4D-40 is the ____ mm equivalent on 35mm format?

So, which is it?

The 35mm on a full frame 645 has an equivalent of 22mm on a 135mm camera but as we know there are no full frame  digital backs on the market so the digital medium format equivalents (135mm) are:
23mm for the H4D 60
25mm for the H4D 50
27mm for the H4D 31
and 27.5 for the H4D 40

and for Medium format 645:

36mm for the H4D 60 (maybe under a mm difference on this sensor)
39mm for the H4D 50 so 38.5 could be correct
42mm for the H4D 31 and
43mm for the H4D 40

If we want to be so accurate though we have to take into consideration the fact that the HC 35mm is 35.8mm in practice.
http://www.hasselblad.com/media/1f9ad1ce-5a29-49cc-97c5-244a70f5d446-HC35.pdf

I hope this information was helpful 

G.telis

[GeorgeTelis]

H4D 40 has a 44x33mm sensor which is smaller than the 60x45mm of the medium format 645 in this case the 1.3crop factor of the H4D 40 is used to calculate the FOV for the equivalent on the 645 system

35mm on H4D 40 x 1.3 crop = 45.5mm on a full frame 645

The 35mm sensor is smaller than the H4D 40's sensor in this case the crop factor is 0.8 if you want to calculate the FOV on the 35mm

35mm on H4D 40 x0.8crop = 28mm on a full frame 35mm SLR

[ghoonk]

Thanks, George, that seems to make sense, which goes back to my understanding that:

28/4 HCD on H4D-40/31 = 22mm on Nikon D3
35/3.5 HC on H4D-40/31 = 28mm on Nikon D3
50/3.5 HC on H4D-40/31 = 39mm on Nikon D3
80/2.8 HC on H4D-40/31 = 63mm on Nikon D3
100/2.2 HC on H4D-40/31 = 78mm on Nikon D3
120mm HC Macro on H4D-40/31 = 94mm on Nikon D3
150mm HC on H4D-40/31 = 118mm on Nikon D3
210mm HC on H4D-40/31 = 165mm on Nikon D3

What I didn't understand earlier was the bit about:

and for Medium format 645:

36mm for the H4D 60 (maybe under a mm difference on this sensor)
39mm for the H4D 50 so 38.5 could be correct
42mm for the H4D 31 and
43mm for the H4D 40

which had me wondering why a 35mm lens would have the FOV of 43mm on 35mm film.

Aside from this, it pretty much makes sense - for my H4D-40, I just need to take 20% off the focal length to get an idea of the kind of FOV to expect

[Cezär Motta]

Cool guys, but, with all these conversions, does exist any converter to use our Hasselblad HC lenses on any Nikon / Canon 35mm cameras?
I know that you can use the Hasselblad V lenses, but not the HC... does anyone know anything about it?

Big hug, and thanks George for the conversions...
Cezär Motta

[GeorgeTelis]

I have a EXCEL crop factor converter. I can send it on your email. 

[Cezär Motta]

Hi George,

I meant a physical converter... something we could mount onto our nikon/canon cameras with our Hasselblad HC lenses...

Big hug!
Cezär Motta.

[ghoonk]

Cezar, there are converters out there that allow Hasselblad lenses to be used on Nikon bodies, but I'm not sure if there will be any benefits over the Nikon lenses optimized for the FF system

George - could you mail the Excel sheet to me? Thanks!

[Cezär Motta]

Cezar, there are converters out there that allow Hasselblad lenses to be used on Nikon bodies, but I'm not sure if there will be any benefits over the Nikon lenses optimized for the FF system

George - could you mail the Excel sheet to me? Thanks!

Could you advice me a good one!? I couldn't find any for the HC lenses on the web... only for the V system...

Many thanks, Cezär Motta.

[ghoonk]

My bad - the Kipon adapters I'm familiar with are for use with the C/CF lenses. Sorry