khalidikram

Has anyone tried using a Hasselblad lens (I am thinking specifically of the 120/4 macro and the 250) on a Nikon D800 or D300s? What would be the enlargement factor (I apologize if this is not the correct term; I mean like using a FF lens on the D300s gives you a 1.5 factor)? Of course the lens would have to be used manually and one would require the appropriate adapter.

RWR Loc: La Mesa, CA

A 120mm lens is a 120mm lens, no matter the sensor size - there is no factor to consider.

khalidikram

Thanks, that saves a bit of arithmetic!

oldtigger Loc: Roanoke Virginia-USA

didn't have a hassy lens but used a 250 mamiya on my D800 and measured a facter of 1.7

Hardly worth the trouble of adapting it.

Why do you ask?

RWR Loc: La Mesa, CA

Here's one I cannot figure out. I have a 150mm wide angle lens for my 5 x 7 view camera - what would the factor be if I were to mount this lens on my FX format DSLR?

f8lee Loc: New Mexico

It is still a 150MM lens, so if you wanted to know what the angle of view would be on a DX camera use the 1.5 Crop factor to calculate 225MM.

The smaller the sensor, the narrower angle of view a given lens will provide-it's just the geometry. That's why a 150 mm lens is a wide angle on your 4 x 5 view camera (and it would be ultra wide angle on an 8 x 10) but behaves like a telephoto lens on full frame or smaller sensors.

Focal length never changes-150 mm lens is a 150 mm lens no matter what you put it in front of. The angle of you that is afforded by a particular focal length on a particular sensor size is the key. All this "crop factor" stuff has to do with the fact that 35mm film cameras was so ubiquitous over so many yearsthat most photographers know in their minds what field of view a 50 mm or 300 mm lens would have, so as a mental trick it's easy kind of figure out what field of you given focal length would have on something small like a DX sensor.

Of course, another big difference with the 150 mm lens that you have compared to 150 mm lens made for a DSLR is the diameter of the light come on projected behind the lens on to the sensor-while the view camera 150 mm lens would not fit yet on an FX DSLR, A 150 mm DSLR Lens with severe leaving yet if placed in front of a 4 x 5 sheet of film.

oldtigger Loc: Roanoke Virginia-USA

3.5

f8lee Loc: New Mexico

This is incorrect. The lens is a 150 mm lens, period. The "crop factor" on an FX camera is 1, which is to say there is no multiplication required. The angle of view of this 150 mm lens on an FX sensor, which is substantially smaller than a sheet of 5 x 7 film, is substantially narrower than that same lens would be on the film.

Part of the confusion here is that the thing that really matters is angle of view- however, as I mentioned above, the ubiquity of 35mm film cameras for so many years has led to most people inherently understanding the angle of view for a given focal length

RWR Loc: La Mesa, CA

I hope you have a sense of humor, as I was of course joking with you. It is a common misconception, but any lens of any given focal length that covers an area larger than 36 x 24mm will give the same field of view on an FX format as the same given focal length lens made for 36 x 24mm. (Hope you're laughing!)

oldtigger Loc: Roanoke Virginia-USA

i'm not making any statements about crop factor or focal length, just answering the question. The image size on the sensor is 3.5 times what a normal fx lens would have made.

Just joking of course

f8lee Loc: New Mexico

I do, but unfortunately those who don't understand how this stuff works are easily confused

oldtigger Loc: Roanoke Virginia-USA

i don't understand how one can get confused.
i just laid the ruler on the ground glass and measured the images from the two lenses. No math involved.

lamiaceae Loc: San Luis Obispo County, CA

Meaning oldtigger has a 150mm lens. This is where it gets confusing when comparing to film formats. A 150mm "Symmar" type view camera lens throws a much smaller image circle than a 150mm "Super Angulon" type lens. Very different lens construction yet same focal length and "magnification". And different yet than a wide angle on a SLR / DSLR that uses WA lenses that are probably retro-focus so as to clear the mirror. And Wow, oldtigger dared to do an actual experiment! :thumbup:

oldtigger Loc: Roanoke Virginia-USA

in the case of the 250mm lens, i used the mamiya press 23 it was used with.
in the case of the 150mm lens, i used an old view camera i assume it was properly sized for since it was a government issue military camera.

(The view camera was olive drab but i refinished it in canary yellow so i wouldnt lose track of where i last used it.)

PhotoArtsLA Loc: Boynton Beach

The reason, perhaps, some people want to mount a Hasselblad lens on a small format camera is ZEISS image quality. Zeiss makes lenses for all DSLRs, even lenses with variable lens adapters. Generally, the ZEISS lens will outperform the equivalent OEM lens, particularly those lenses coming from their cinema line.

As to crop factor, it's all about the image circle. This is why a 12mm lens for a one inch sensor has a different crop factor than a 12mm lens for an APS sensor. For another example, the 6mm f/2.8 Nikkor for full frame (24x36mm) will have a much larger crop factor than my 6mm f/1.8 Kowa for 1 inch sensor size.

Additionally, I might wager my Kowa might be sharper, but really don't want to pay over $200,000 for the Nikkor. Maybe some unwitting person might sell one at an unwitting price on Ebay. On full frame (24x36mm,) the 6mm f/2.8 Nikkor has about a 220 degree field of vew. You have to keep your elbows tucked in, or you will see them.

As to Super Angulons for 4x5, these lenses require a custom circular neutral density filter matched to the light falloff of the lens.